Record 1 of 318

Title: Scientific objectives and payloads of the lunar sample return mission-Chang'E-5

Author(s): Zhou, CY (Zhou, Changyi); Jia, YZ (Jia, Yingzhuo); Liu, JZ (Liu, Jianzhong); Li, HJ (Li, Huijun); Fan, Y (Fan, Yu); Zhang, ZL (Zhang, Zhanlan); Liu, Y (Liu, Yang); Jiang, YY (Jiang, Yuanyuan); Zhou, B (Zhou, Bin); He, ZP (He, Zhiping); Yang, JF (Yang, Jianfeng); Hu, YF (Hu, Yongfu); Liu, ZH (Liu, Zhenghao); Qin, L (Qin, Lang); Lv, BH (Lv, Bohan); Fu, ZL (Fu, Zhongliang); Yan, J (Yan, Jun); Wang, C (Wang, Chi); Zou, YL (Zou, Yongliao)

Source: ADVANCES IN SPACE RESEARCH  Volume: 69  Issue: 1  Pages: 823-836  DOI: 10.1016/j.asr.2021.09.001  Early Access Date: DEC 2021   Published: JAN 1 2022  

Abstract: In the early morning on December 17, 2020 Beijing time, China's chang'E-5 probe successfully returned to the Earth with 1731 g of lunar samples after completing drilling, shoveling, packaging of lunar soil and scientific exploration on lunar surface. It is the successful completion of the third phase of China's lunar exploration project, namely "circling, landing and returning to the moon". The scientific objectives of CE-5 mission are to carry out in situ investigation and analysis of the lunar landing region, laboratory research and analysis of lunar return samples. This paper analyzes scientific exploration tasks of CE-5 mission conducted on the lunar surface, and carries out the scientific payload system architecture design and individual scientific payload design with the scientific exploration task requirements as the target, and proposes the working mode and main technical index requirements of the scientific payloads. Based on the preliminary geological background study of the Mons Ruemker region which is the landing region of CE-5, the lunar scientific exploration and the laboratory physicochemical characterization of the return samples are of great scientific significance for our in-depth understanding of the formation and evolution of the Earth-Moon system and the chemical evolution history of the lunar surface.

Accession Number: WOS:000734907800009

Author Identifiers:

ISSN: 0273-1177

eISSN: 1879-1948

Record 2 of 318

Title: Direct Observation of Axial Dynamics of Particle Manipulation With Weber Self-Accelerating Beams

Author(s): An, S (An, Sha); Peng, T (Peng, Tong); Yan, SH (Yan, Shaohui); Yao, BL (Yao, Baoli); Zhang, P (Zhang, Peng)

Source: FRONTIERS IN PHYSICS  Volume: 9  Article Number: 816844  DOI: 10.3389/fphy.2021.816844  Published: DEC 16 2021  

Abstract: Optical manipulation of micro-particles with nondiffracting and self-accelerating beams has been successfully applied in many research fields such as chemicophysics, material sciences and biomedicine. Such operation mainly focuses on the particle transport and control in the beam propagation direction. However, the conventional optical microscopy is specifically designed for obtaining the sample information located in the lateral plane, which is perpendicular to the optical axis of the detecting objective lens, making the real-time observation of particle dynamics in axial plane a challenge. In this work, we propose and demonstrate a technique which integrates a special beam optical tweezer with a direct axial plane imaging system. Here, particles are transported in aqueous solution along a parabolic trajectory by a designed nonparaxial Weber self-accelerating beam, and the particle motion dynamics both in lateral and axial plane are monitored in real-time by the axial plane imaging technique.

Accession Number: WOS:000738327900001

ISSN: 2296-424X

Record 3 of 318

Title: Highly Versatile Broadband RF Photonic Fractional Hilbert Transformer Based on a Kerr Soliton Crystal Microcomb

Author(s): Tan, MX (Tan, Mengxi); Xu, XY (Xu, Xingyuan); Boes, A (Boes, Andreas); Corcoran, B (Corcoran, Bill); Wu, JY (Wu, Jiayang); Nguyen, TG (Nguyen, Thach G.); Chu, ST (Chu, Sai T.); Little, BE (Little, Brent E.); Lowery, AJ (Lowery, Arthur J.); Morandotti, R (Morandotti, Roberto); Mitchell, A (Mitchell, Arnan); Moss, DJ (Moss, David J.)

Source: JOURNAL OF LIGHTWAVE TECHNOLOGY  Volume: 39  Issue: 24  Pages: 7581-7587  DOI: 10.1109/JLT.2021.3101816  Published: DEC 15 2021  

Abstract: We demonstrate an RF photonic fractional Hilbert transformer based on an integrated Kerr micro-comb source featuring a record low free spectral range of 48.9 GHz, yielding 75 microcomb lines across the C-band. By programming and shaping the comb lines according to calculated tap weights, we demonstrate that the Hilbert transformer can achieve tunable bandwidths ranging from 1.2 to 15.3 GHz, switchable centre frequencies from baseband to 9.5 GHz, and arbitrary fractional orders. We experimentally characterize the RF amplitude and phase response of the tunable bandpass and lowpass Hilbert transformers with 90 and 45-degree phase shift. The experimental results show good agreement with theory, confirming the effectiveness of our approach as a powerful way to implement the standard as well as fractional Hilbert transformers with broad and switchable processing bandwidths and centre frequencies, together with high reconfigurability and greatly reduced size and complexity.

Accession Number: WOS:000728929200010

Author Identifiers:

ISSN: 0733-8724

eISSN: 1558-2213

Record 4 of 318

Title: Enhanced Photoluminescence of Monolayer MoSe₂ in a Double Resonant Plasmonic Nanocavity with Fano Resonance and Mode Matching

Author(s): Li, CY (Li, Chenyang); Wang, QF (Wang, Qifa); Diao, H (Diao, Hang); Hao, Z (Hao, Zhen); Yu, WX (Yu, Weixing); Liu, KH (Liu, Kaihui); Gan, XT (Gan, Xuetao); Xiao, FJ (Xiao, Fajun); Zhao, JL (Zhao, Jianlin)

Source: LASER & PHOTONICS REVIEWS  Volume: 16  Issue: 2  Article Number: 2100199  DOI: 10.1002/lpor.202100199  Early Access Date: DEC 2021   Published: FEB 2022  

Abstract: Two-dimensional transition metal dichalcogenides exhibit remarkable optical properties. However, their applications in electronics and photonics are severely limited by the intrinsically low absorption and emission rates. Here, the photoluminescence (PL) enhancement by integrating the monolayer MoSe2 into an Ag nanowire-on-mirror (NWoM) nanocavity is reported. From the dark-field scattering spectrum, a Fano resonance resulting from the coupling between discrete exciton state of MoSe2 and broad plasmon mode of nanocavity is observed. This Fano resonance, as a characteristic of intermediate plasmon-exciton coupling, shows remarkable ability to accelerate emission rate of MoSe2. Furthermore, the nanocavity with multiple resonances provides an excellent spatial mode overlap at excitation and emission wavelengths that affords the intriguing opportunity to resonantly enhance the absorption and PL quantum yield at the same location. The combination of Fano resonance and mode matching allows the attainment of over 1800-fold PL enhancement. These results provide a facile way to enhance the PL intensity of monolayer MoSe2 that may facilitate highly efficient optoelectronic devices.

Accession Number: WOS:000729431600001

Author Identifiers:

ISSN: 1863-8880

eISSN: 1863-8899

Record 5 of 318

Title: Enhancement of UV laser-induced damage resistance of the fluoride-containing phosphate glasses by regulating the intrinsic defects

Author(s): Li, SW (Li, Shengwu); Wan, R (Wan, Rui); Ma, Y (Ma, Yuan); Wang, PF (Wang, Pengfei)

Source: JOURNAL OF THE AMERICAN CERAMIC SOCIETY  Volume: 105  Issue: 4  Pages: 2546-2555  DOI: 10.1111/jace.18255  Early Access Date: DEC 2021   Published: APR 2022  

Abstract: Low fluorine content containing fluorophosphate glasses have promising potential as ultraviolet (UV) optics to be used in high-energy laser systems. Systematic studies on the iron-doped and iron-free fluoride-containing phosphate glasses that were prepared at high and low melting temperatures explore the underlying interrelationship among the glass preparation conditions, intrinsic defects in produced glasses, and the anti-laser-damage properties. For the iron-doped fundamental frequency (1 omega) absorptive glass, melting at high-temperature (1200 degrees C) can reduce the extrinsic "impurity" concentration of Fe3+ ions, resulting in tiny increase of optical bandgap (by 1.6%) but significant reduce of the absorption coefficient by 34% at 355 nm. However, only tiny increase of the laser-induced damage threshold (LIDT) was achieved. For the iron-free third harmonic frequency (3 omega) transparent glass, low-temperature (1000 degrees C) melting process significantly reduced the absorptive intrinsic defects content of PO3-EC, PO4-EC, and phosphorous oxygen-bonded hole center defects, which made the UV absorption edge blue-shifted by 50 nm and the optical bandgap increased by similar to 18%. The UV (355 nm) LIDT was significantly enhanced by similar to 27%. Much lower absorption coefficient and larger bandgap of the iron-free glass relative to the iron-doped one endow it with larger a LIDT. In short, optimizing the glass melting temperature is a feasible method to enhance the UV laser-induced damage resistance of the fluoride-containing phosphate glasses through controlling the content of the extrinsic or intrinsic defects in produced glasses. The general routine is to achieve both the lower UV absorptive defect concentration (i.e., lower UV absorption at 355 nm) and the lower non-bridged oxygen ratio (i.e., denser glass network), as well as a larger optical bandgap (i.e., reduced probability of avalanche ionization breakdown), which together contribute to the enhancement of the anti-laser-damage performance of the investigated fluoride-containing phosphate glasses.

Accession Number: WOS:000729273000001

Author Identifiers:

ISSN: 0002-7820

eISSN: 1551-2916

Record 6 of 318

Title: Spatial X-ray detection system based on simultaneous communication and radar

Author(s): Ma, WH (Ma Weihong); Li, Y (Li Yao); Sheng, LZ (Sheng Lizhi); Su, T (Su Tong); Zhang, YJ (Zhang Yingjun); Liu, JN (Liu Jiani); Xia, FY (Xia Fangyuan); Tan, ZK (Tan Zhenkun); Zhang, FR (Zhang Furui); Chen, R (Chen Rui)

Source: INTERNATIONAL JOURNAL OF MODERN PHYSICS B  Volume: 35  Issue: 30  Article Number: 2150307  DOI: 10.1142/S0217979221503070  Published: DEC 10 2021  

Abstract: An integrated scheme of X-ray communication and detection is proposed in this paper, which is used for the detection of the unknown target inside the coating while communication. In contrast to the X-ray communication methods reported previously, simultaneous communication and radar detection have two distinct features. One is that both communication and detection signals share the same X-ray source and channel, so the spatial resources can be effectively utilized. The other is that X-ray can penetrate the metal shielding structure and detect the internal materials effectively. In order to achieve the above goals, the propagation feasibility of an X-ray signal in space and space sparse plasma environment are first analyzed. Simulation and experiment results indicate that the X-ray carrier can realize transmission without attenuation in space environment. Then, an X-ray radar and communication demonstration system is built to verify the detection ability of coated materials. Experimental results show that when the characteristic spectrum value of the unknown target is much higher than that of the rest shell, the spatial X-ray radar system can achieve more accurate discrimination. Finally, a conclusion is reached, and some feasible detection suggestions are provided for this simultaneous detection and communication system.

Accession Number: WOS:000724332900006

Author Identifiers:

ISSN: 0217-9792

eISSN: 1793-6578

Record 7 of 318

Title: Laser beam jitter control of the link in free space optical communication systems

Author(s): Wang, X (Wang, Xuan); Su, XQ (Su, Xiuqin); Liu, GZ (Liu, Guizhong); Han, JF (Han, Junfeng); Wang, R (Wang, Rui); Wang, KD (Wang, Kaidi)

Source: OPTICS EXPRESS  Volume: 29  Issue: 25  Pages: 41582-41599  DOI: 10.1364/OE.443411  Published: DEC 6 2021  

Abstract: The pointing and tracking performance of laser beams in free space optical communication (FSOC) systems and other precision laser systems is severely limited by beam jitter. This research proposes an adaptive control method to suppress beam jitter by adjusting the deflection angle of the beam by controlling the fast steering mirror (FSM) driven by piezoelectric ceramics. In order to verify the effectiveness of the control method, we have established an experimental platform. First, the internal controller of the FSM is adjusted to an approximately linear system, aiming to turn the input and output control signals into a linear relationship. Based on the adaptive filter, a filtered-x variable step-size normalized least mean square (FxVSNLMS) algorithm is proposed. To further improve the robustness of the controller, a Proportion Integral Differential (PID) controller and an adaptive controller which work in parallel are then added to the control loop. Finally, experimental results are provided and compare with the traditional controller and other adaptive control methods. Experimental results show that for more complex narrow-band and broad-band mixed beam disturbances, the control scheme developed in this research is significantly improved. This conclusion has also been verified on the ground experimental platform of FSOC. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Accession Number: WOS:000726115900070

Author Identifiers:

ISSN: 1094-4087

Record 8 of 318

Title: Optimal superpixel selection for hyperspectral image classification of limited training samples

Author(s): Wang, WN (Wang, Wenning); Liu, XB (Liu, Xuebin); Mou, XQ (Mou, Xuanqin)

Source: INTERNATIONAL JOURNAL OF REMOTE SENSING  Volume: 42  Issue: 23  Pages: 9059-9075  DOI: 10.1080/01431161.2021.1988184  Published: DEC 2 2021  

Abstract: The hyperspectral image (HSI) classification method based on superpixel segmentation can solve the HSI classification problem of limited training samples. The proposed method improves the classification accuracy of each test sample by selecting the optimal superpixel for it and then extracting classification features. First, an HSI is segmented into superpixels with different scales. Subsequently, we propose an optimal superpixel evaluation method that selects the optimal superpixel for each sample in the HSI to extract classification feature. Lastly, the optimal superpixel is selected for each training sample to augment the training samples and improve the accuracy of the classifier. Experiments on two datasets indicate that the proposed method can effectively improve the classification accuracy of HSIs with limited training samples.

Accession Number: WOS:000711679400001

ISSN: 0143-1161

eISSN: 1366-5901

Record 9 of 318

Title: Dual-wavelength in-line digital holography with untrained deep neural networks

Author(s): Bai, C (Bai, Chen); Peng, T (Peng, Tong); Min, JW (Min, Junwei); Li, RZ (Li, Runze); Zhou, Y (Zhou, Yuan); Yao, BL (Yao, Baoli)

Source: PHOTONICS RESEARCH  Volume: 9  Issue: 12  Pages: 2501-2510  DOI: 10.1364/PRJ.441054  Published: DEC 1 2021  

Abstract: Dual-wavelength in-line digital holography (DIDH) is one of the popular methods for quantitative phase imaging of objects with non-contact and high-accuracy features. Two technical challenges in the reconstruction of these objects include suppressing the amplified noise and the twin-image that respectively originate from the phase difference and the phase-conjugated wavefronts. In contrast to the conventional methods, the deep learning network has become a powerful tool for estimating phase information in DIDH with the assistance of noise suppressing or twin-image removing ability. However, most of the current deep learning-based methods rely on supervised learning and training instances, thereby resulting in weakness when it comes to applying this training to practical imaging settings. In this paper, a new DIDH network (DIDH-Net) is proposed, which encapsulates the prior image information and the physical imaging process in an untrained deep neural network. The DIDH-Net can effectively suppress the amplified noise and the twin-image of the DIDH simultaneously by automatically adjusting the weights of the network. The obtained results demonstrate that the proposed method with robust phase reconstruction is well suited to improve the imaging performance of DIDH. (C) 2021 Chinese Laser Press

Accession Number: WOS:000724596800021

Author Identifiers:

ISSN: 2327-9125

Record 10 of 318

Title: Improving physical parameters estimation in the single-beam multiple-intensity reconstruction

Author(s): Chen, XY (Chen, Xiaoyi); Duan, YX (Duan, Yaxuan); Da, ZS (Da, Zhengshang)

Source: JOURNAL OF OPTICS  Volume: 23  Issue: 12  Article Number: 125601  DOI: 10.1088/2040-8986/ac2ea9  Published: DEC 2021  

Abstract: The iterative phase retrieval based on phase diversity technologies can solve the stagnation problem of Gerchberg-Saxton algorithm which performs Fourier transform to iterate back and forth between the object and spectral planes with known constraints. However, the application of phase diversity technologies in iterative phase retrieval methods will bring in multiple physical parameters such as distances or wavelengths. The measured accuracy of these physical parameters will ultimately affect the accuracy of the iterative phase retrieval methods. In this paper, a physical parameters estimation method which has the advantages of high global convergence and local convergence is proposed to improve the accuracy of iterative phase retrieval methods. Meanwhile, this method is introduced in the single-beam multiple-intensity reconstruction (SBMIR), termed PE-SBMIR, and its performance is verified by simulations and experiments. By simulating multiple sets of distance parameters with errors, the retrieved accuracy using PE-SBMIR can be improved by 2-4 orders of magnitude compared with SBMIR. Experimental results show that whether it is an amplitude-type object or phase-type object, the accuracy using PE-SBMIR is significantly higher than using SBMIR. The physical parameters estimation method proposed in this paper may be adopted in other iterative phase retrieval methods using phase diversity technologies.

Accession Number: WOS:000714212100001

Author Identifiers:

ISSN: 2040-8978

eISSN: 2040-8986

Record 11 of 318

Title: Deep Category-Level and Regularized Hashing With Global Semantic Similarity Learning

Author(s): Chen, YX (Chen, Yaxiong); Lu, XQ (Lu, Xiaoqiang)

Source: IEEE TRANSACTIONS ON CYBERNETICS  Volume: 51  Issue: 12  Pages: 6240-6252  DOI: 10.1109/TCYB.2020.2964993  Published: DEC 2021  

Abstract: The hashing technique has been extensively used in large-scale image retrieval applications due to its low storage and fast computing speed. Most existing deep hashing approaches cannot fully consider the global semantic similarity and category-level semantic information, which result in the insufficient utilization of the global semantic similarity for hash codes learning and the semantic information loss of hash codes. To tackle these issues, we propose a novel deep hashing approach with triplet labels, namely, deep category-level and regularized hashing (DCRH), to leverage the global semantic similarity of deep feature and category-level semantic information to enhance the semantic similarity of hash codes. There are four contributions in this article. First, we design a novel global semantic similarity constraint about the deep feature to make the anchor deep feature more similar to the positive deep feature than to the negative deep feature. Second, we leverage label information to enhance category-level semantics of hash codes for hash codes learning. Third, we develop a new triplet construction module to select good image triplets for effective hash functions learning. Finally, we propose a new triplet regularized loss (Reg-L) term, which can force binary-like codes to approximate binary codes and eventually minimize the information loss between binary-like codes and binary codes. Extensive experimental results in three image retrieval benchmark datasets show that the proposed DCRH approach achieves superior performance over other state-of-the-art hashing approaches.

Accession Number: WOS:000733232400054

PubMed ID: 32112686

Author Identifiers:

ISSN: 2168-2267

eISSN: 2168-2275

Record 12 of 318

Title: Multisource Remote Sensing Data Classification With Graph Fusion Network

Author(s): Du, XQ (Du, Xingqian); Zheng, XT (Zheng, Xiangtao); Lu, XQ (Lu, Xiaoqiang); Doudkin, AA (Doudkin, Alexander A.)

Source: IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING  Volume: 59  Issue: 12  Pages: 10062-10072  DOI: 10.1109/TGRS.2020.3047130  Published: DEC 2021  

Abstract: The land cover classification has been an important task in remote sensing. With the development of various sensors technologies, carrying out classification work with multisource remote sensing (MSRS) data has shown an advantage over using a single type of data. Hyperspectral images (HSIs) are able to represent the spectral properties of land cover, which is quite common for land cover understanding. Light detection and ranging (LiDAR) images contain altitude information of the ground, which is greatly helpful with urban scene analysis. Current HSI and LiDAR fusion methods perform feature extraction and feature fusion separately, which cannot well exploit the correlation of data sources. In order to make full use of the correlation of multisource data, an unsupervised feature extraction-fusion network for HSI and LiDAR, which utilizes feature fusion to guide the feature extraction procedure, is proposed in this article. More specifically, the network takes multisource data as input and directly output the unified fused feature. A multimodal graph is constructed for feature fusion, and graph-based loss functions including Laplacian loss and t-distributed stochastic neighbor embedding (t-SNE) loss are utilized to constrain the feature extraction network. Experimental results on several data sets demonstrate the proposed network can achieve more excellent classification performance than some state-of-the-art methods.

Accession Number: WOS:000722170500024

Author Identifiers:

ISSN: 0196-2892

eISSN: 1558-0644

Record 13 of 318

Title: Selective Etching of Sr-Modified and Directionally Solidified Industrial Al-Si Eutectic Alloys for Fabricating Fibrous Eutectic Si

Author(s): Gao, JJ (Gao, Jianjun); Gu, W (Gu, Wei); Zhang, FF (Zhang, Fenfei); Geng, HB (Geng, Haibin); Zhong, JH (Zhong, Jianhua); Yao, LG (Yao, Ligang); Zhao, ZL (Zhao, Zhilong); Wang, JN (Wang, Junning)

Source: METALS  Volume: 11  Issue: 12  Article Number: 1974  DOI: 10.3390/met11121974  Published: DEC 2021  

Abstract: In order to fabricate fibrous eutectic Si, the selective etching of industrial Al-Si eutectic alloys directionally solidified at different growth rates and modified by different amounts of Sr was studied. Flake eutectic and fibrous Si were obtained by selective etching of non-modified, Sr-modified or directionally solidified Al-Si eutectic alloys. The optimal amount of Sr for fabricating branching eutectic Si was 0.04-0.07%. Through directional solidification with a high enough growth rate (more than 200 mu m/s), lamellar eutectic Si transforms to fibrous eutectic Si for use in non-modified Al-Si eutectic alloys. The potentiodynamic polarization and cyclic voltammetry methods were used to test the corrosion behavior of non-modified and Sr-modified Al-Si eutectic alloys. With a constant potential of 0.5 V in HCl solution, non-modified Al-Si eutectic alloys displayed initial pitting corrosion and subsequent spalling corrosion, and 0.04% Sr-modified samples displayed uniform pitting corrosion. Compared with non-modified Al-Si eutectic alloys, Sr-modified samples displayed better corrosion resistance with lower current density and shallower pit depth during the same etching conditions.

Accession Number: WOS:000736320400001

Author Identifiers:

eISSN: 2075-4701

Record 14 of 318

Title: High-throughput fast full-color digital pathology based on Fourier ptychographic microscopy via color transfer (vol 64, 114211, 2021)

Author(s): Gao, YT (Gao, Yuting); Chen, JR (Chen, Jiurun); Wang, AY (Wang, Aiye); Pan, A (Pan, An); Ma, CW (Ma, Caiwen); Yao, BL (Yao, Baoli)

Source: SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY  Volume: 64  Issue: 12  Article Number: 124251  DOI: 10.1007/s11433-021-1762-8  Published: DEC 2021  

Accession Number: WOS:000714035800001

Author Identifiers:

ISSN: 1674-7348

eISSN: 1869-1927

Record 15 of 318

Title: Cross-Domain Scene Classification by Integrating Multiple Incomplete Sources

Author(s): Gong, TF (Gong, Tengfei); Zheng, XT (Zheng, Xiangtao); Lu, XQ (Lu, Xiaoqiang)

Source: IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING  Volume: 59  Issue: 12  Pages: 10035-10046  DOI: 10.1109/TGRS.2020.3034344  Published: DEC 2021  

Abstract: Cross-domain scene classification identifies scene categories by learning knowledge from a labeled data set (source domain) to an unlabeled data set (target domain), where the source data and the target data are sampled from different distributions. A lot of domain adaptation methods are used to reduce the distribution shift across domains, and most existing methods assume that the source domain shares the same categories with the target domain. It is usually hard to find a source domain that covers all categories in the target domain. Some works exploit multiple incomplete source domains to cover the target domain. However, in such setting, the categories of each source domain are a subset of the target-domain categories, and the target domain contains "unknown" categories for each source domain. The existence of unknown categories results in the conventional domain adaptation unsuitable. Known and unknown categories should be treated separately. Therefore, a separation mechanism is proposed to separate the known and unknown categories in this article. First, multiple-source classifiers trained on the multiple source domains are used to coarsely separate the known/unknown categories in the target domain. The target images with high similarities to source images are selected as known categories, and the target images with low similarities are selected as unknown categories. Then, a binary classifier trained using the selected images is used to finely separate all target-domain images. Finally, only the known categories are implemented in the cross-domain alignment and classification. The target images get labels by integrating the hypotheses of multiple-source classifiers on the known categories. Experiments are conducted on three cross-domain data sets to demonstrate the effectiveness of the proposed method.

Accession Number: WOS:000722170500022

ISSN: 0196-2892

eISSN: 1558-0644

Record 16 of 318

Title: Numerical Simulation Study on Gain Nonlinearity of Microchannel Plate in Photomultiplier Tube

Author(s): Guo, LH (Guo, Lehui); Chen, P (Chen, Ping); Li, LL (Li, Lili); Gou, YS (Gou, Yongsheng); Liu, HL (Liu, Hulin); Liu, ZY (Liu, Ziyu); Xin, LW (Xin, Liwei); Tian, JS (Tian, Jinshou)

Source: IEEE TRANSACTIONS ON NUCLEAR SCIENCE  Volume: 68  Issue: 12  Pages: 2711-2716  DOI: 10.1109/TNS.2021.3121583  Published: DEC 2021  

Abstract: Microchannel plate-photomultiplier tubes (MCP-PMTs) with high dynamic ranges and strong outputs are still challenges for the future inertial confinement fusion (ICF) studies, aiming at detecting the large-scale intensities of the radiation pulses. In this article, to investigate the influence factors of the gain nonlinearity causing high-linearity limits of the MCP-PMTs, 3-D microchannel plate (MCP) channel models were built in computer simulation technology (CST) Particle Studio. The Monte Carlo and particle-in-cell methods were carried out to simulate the electron cascade processes in the channels of the MCPs. The dependences of MCP gain nonlinearity on the number of incident electrons, operating voltage, and secondary electron emission (SEE) yield properties were studied. The gains obtained by the simulations for the conventional one-stage and two-stage MCPs are in good agreement with the available experimental data, which verifies the reliabilities of the 3-D MCP models. The simulation results show that the gain of the MCP single channel decreases as the number of incident electrons increases due to the space charge effects. The higher the operating voltage and SEE yield of the MCP, the faster the gain deteriorates. To mitigate the gain saturation effect of MCP single channels, a novel structural design of MCP-PMTs has been proposed by adjusting the design of the MCP chevron pair. A significant improvement in the output pulse peak can be obtained.

Accession Number: WOS:000731147000007

Author Identifiers:

ISSN: 0018-9499

eISSN: 1558-1578

Record 17 of 318

Title: Nonlinear Full-Spectrum Quantitative Analysis Algorithm of Complex Water Based on IERT

Author(s): Liu, JC (Liu Jia-cheng); Hu, BL (Hu Bing-liang); Yu, T (Yu Tao); Wang, XJ (Wang Xue-ji); Du, J (Du Jian); Liu, H (Liu Hong); Liu, X (Liu Xiao); Huang, QX (Huang Qi-xing)

Source: SPECTROSCOPY AND SPECTRAL ANALYSIS  Volume: 41  Issue: 12  Pages: 3922-3930  DOI: 10.3964/j.issn.1000-0593(2021)12-3922-09  Published: DEC 2021  

Abstract: Water is a finite resource, essential for agriculture, industry and even human existence. A good water environment is an important guarantee for sustainable development. The scientific monitoring of water quality information is the basis for optimal allocation and efficient use of water resources. The United Nations Environment Program (UNEP) and the World Health Organization (WHO) pointed out that national water quality monitoring networks in developing countries should be strengthened, including improving analytical capabilities and data quality assurance. As an emerging water quality analysis method, spectral method has the characteristics of "fast response, synchronization of multiple parameters, environmental protection and pollution-free" compared with traditional chemical water quality monitoring methods. The traditional single-band, multi-band linear model, relies on the absorption characteristics of water at specific bands, and it cannot be used for multi-component mixed solutions and has poor universality. Therefore, this paper proposes a non-linear full-spectrum quantitative analysis algorithm based on IERT. The concentration prediction model suitable for multi-component mixed solution is established to use full spectrum information to predict concentration information. We use the COD, BOD5, TOC multi-component mixed solution and NO3-N, turbidity, chroma multi-component mixed solution configured in the laboratory as the experimental sample, use the spectrometer to collect the spectral curve of the sample, and conduct the concentration prediction experiment through the full spectrum data. The experimental results show that for COD, BOD5, TOC multi-component mixed solutions, the determination coefficients (R-2) of this algorithm for the three components are 0. 999 3, 0. 991 4 and 0. 999 3. The root means square error (RMSE) is 0. 024 4, 0. 057 7 and 0. 000 4. For the multi-component mixed solution of NO3-N, turbidity, and colority, the coefficient of determination (R-2) is 0.983 4, 0.868 4 and 0.981 0. The root means square error (RMSE) is 0. 100 5, 0.326 4 and 0. 120 2. By comparing the experimental results of this algorithm with partial least squares (PLS), support vector regression (SVR), decision tree (DT), and extreme random tree (ERT) for the same set of data, the results show that in the experiment of mixed solution, this algorithm is the best alternative to the coefficient of determination (R-2) of each component. The root means square error (RMSE) has been greatly reduced compared with other comparison algorithms. This algorithm can use spectral information to analyze the multi-component mixed solution quantitatively. It can effectively improve the concentration prediction accuracy and reduce the root-mean-square error of the quantitative analysis in the case of equivalent calculation time. Moreover, this algorithm can provide a theoretical basis for spectral methods on water quality monitoring.

Accession Number: WOS:000747245000044

Author Identifiers:

ISSN: 1000-0593

Record 18 of 318

Title: Frequency Comb Distillation for Optical Superchannel Transmission

Author(s): Prayoonyong, C (Prayoonyong, Chawaphon); Boes, A (Boes, Andreas); Xu, XY (Xu, Xingyuan); Tan, MX (Tan, Mengxi); Chu, ST (Chu, Sai T.); Little, BE (Little, Brent E.); Morandotti, R (Morandotti, Roberto); Mitchell, A (Mitchell, Arnan); Moss, DJ (Moss, David J.); Corcoran, B (Corcoran, Bill)

Source: JOURNAL OF LIGHTWAVE TECHNOLOGY  Volume: 39  Issue: 23  Pages: 7383-7392  DOI: 10.1109/JLT.2021.3116614  Published: DEC 1 2021  

Abstract: Optical frequency combs can potentially provide an efficient light source for multi-terabit-per-second optical superchannels. However, as the bandwidth of these multi-wavelength light sources is increased, it can result in low per-line power. Optical amplifiers can be used to overcome power limitations, but the accompanying spontaneous optical noise can degrade performance in optical systems. To overcome this, we demonstrate wideband noise reduction for comb lines using a high-Q microring resonator whose resonances align with the comb lines, providing tight optical filtering of multiple combs lines at the same time. By distilling an optical frequency comb in this way, we are able to reduce the required comb line OSNR when these lines are used in a coherent optical communications system. Through performance tests on a 19.45-GHz-spaced comb generating 71 lines, using 18 Gbaud, 64-QAM sub-channels at a spectral efficiency of 10.6 b/s/Hz, we find that noise-corrupted comb lines can reduce the optical signal-to-noise ratio required for the comb by similar to 9 dB when used as optical carriers at the transmitter side, and by similar to 12 dB when used as a local oscillator at the receiver side. This demonstration provides a method to enable low power optical frequency combs to be able to support high bandwidth and high-capacity communications.

Accession Number: WOS:000722717700004

Author Identifiers:

ISSN: 0733-8724

eISSN: 1558-2213

Record 19 of 318

Title: Polarization-Independent Large Third-Order-Nonlinearity of Orthogonal Nanoantennas Coupled to an Epsilon-Near-Zero Material

Author(s): Shi, WJ (Shi, Wenjuan); Liu, HJ (Liu, Hongjun); Wang, ZL (Wang, Zhaolu)

Source: NANOMATERIALS  Volume: 11  Issue: 12  Article Number: 3424  DOI: 10.3390/nano11123424  Published: DEC 2021  

Abstract: The nonlinear optical response of common materials is limited by bandwidth and energy consumption, which impedes practical application in all-optical signal processing, light detection, harmonic generation, etc. Additionally, the nonlinear performance is typically sensitive to polarization. To circumvent this constraint, we propose that orthogonal nanoantennas coupled to Al-doped zinc oxide (AZO) epsilon-near-zero (ENZ) material show a broadband (~1000 nm bandwidth) large optical nonlinearity simultaneously for two orthogonal polarization states. The absolute maximum value of the nonlinear refractive index n(2) is 7.65 cm(2)center dot GW(-)(1), which is 4 orders of magnitude larger than that of the bare AZO film and 7 orders of magnitude larger than that of silica. The coupled structure not only realizes polarization independence and strong nonlinearity, but also allows the sign of the nonlinear response to be flexibly tailored. It provides a promising platform for the realization of ultracompact, low-power, and highly nonlinear all-optical devices on the nanoscale.

Accession Number: WOS:000736289600001

PubMed ID: 34947773

Author Identifiers:

eISSN: 2079-4991

Record 20 of 318

Title: Integral order photonic RF signal processors based on a soliton crystal micro-comb source

Author(s): Tan, MX (Tan, Mengxi); Xu, XY (Xu, Xingyuan); Wu, JY (Wu, Jiayang); Corcoran, B (Corcoran, Bill); Boes, A (Boes, Andreas); Nguyen, TG (Nguyen, Thach G.); Chu, ST (Chu, Sai T.); Little, BE (Little, Brent E.); Morandotti, R (Morandotti, Roberto); Mitchell, A (Mitchell, Arnan); Moss, DJ (Moss, David J.)

Source: JOURNAL OF OPTICS  Volume: 23  Issue: 12  Article Number: 125701  DOI: 10.1088/2040-8986/ac2eab  Published: DEC 2021  

Abstract: Soliton crystal micro-combs are powerful tools as sources of multiple wavelength channels for radio frequency (RF) signal processing. They offer a compact device footprint, a large number of wavelengths, very high versatility, and wide Nyquist bandwidths. Here, we demonstrate integral order RF signal processing functions based on a soliton crystal micro-comb, including a Hilbert transformer and first, second and third-order differentiators. We compare and contrast the results and the trade-offs involved with varying the comb spacing, and tap design and shaping methods.

Accession Number: WOS:000714247200001

Author Identifiers:

ISSN: 2040-8978

eISSN: 2040-8986

Record 21 of 318

Title: A New Design of Large-format Streak Tube with Single-lens Focusing System

Author(s): Tian, LP (Tian, Liping); Shen, LB (Shen, Lingbin); Chen, L (Chen, Lin); Li, LL (Li, Lili); Tian, JS (Tian, Jinshou); Chen, P (Chen, Ping); Zhao, W (Zhao, Wei)

Source: MEASUREMENT SCIENCE REVIEW  Volume: 21  Issue: 6  Pages: 191-196  DOI: 10.2478/msr-2021-0026  Published: DEC 2021  

Abstract: Streak tubes with large-format and high spatial resolution are central to mm-spatial-resolved STIL detection system and hyperspectral resolved ICF experiment. In this paper, we established a large-format streak tube with a three-coaxial-cylindrical single-lens focusing system, a spherically curved photocathode and phosphor screen model in CST Particle Studio. The temporal and spatial resolution were calculated and mimicked based on the Monte-Carlo sampling method in static and dynamic mode. The simulated results show that the static spatial resolution reaches 50 lp/mm over the whole 50 mm effective photocathode length, and the physical temporal resolution is better than 45 ps. Furthermore, in dynamic working mode, the streak tube can achieve spatial resolution of 10 lp/mm and temporal resolution of 60 ps. The simulation results will be used to guide the design and production for large-format with high spatial resolution streak tube development.

Accession Number: WOS:000712538800005

Author Identifiers:

ISSN: 1335-8871

Record 22 of 318

Title: Sliding Mode Robust Active Disturbance Rejection Control for Single-Link Flexible Arm with Large Payload Variations

Author(s): Wang, F (Wang, Fan); Liu, P (Liu, Peng); Jing, F (Jing, Feng); Liu, B (Liu, Bo); Peng, W (Peng, Wei); Guo, M (Guo, Min); Xie, ML (Xie, Meilin)

Source: ELECTRONICS  Volume: 10  Issue: 23  Article Number: 2995  DOI: 10.3390/electronics10232995  Published: DEC 2021  

Abstract: This paper proposes a novel robust control scheme for tip trajectory tracking of a lightweight flexible single-link arm. The developed control scheme deals with the influence of tip payload changes and disturbances during the working process of the flexible arm, thus realizing the accurate tracking for the tip reference trajectory. The robust control scheme is composed of an inner loop and an outer loop. The inner loop adopts the traditional PD control, and an active disturbance rejection control (ADRC) with a sliding mode (SM) compensation is designed in the outer loop. Moreover, the sliding mode compensation is mainly used to cope with the disturbance estimation error from the extended state observer (ESO), by which the insensitivity to tip payload variations and strong disturbance resistance is achieved. Finally, some numerical simulations are performed to support the theoretical analysis. The results show that the system is more robust to the tip mass variations of the arm and more resistant to the external torque after adding the sliding mode robustness term to the ADRC.

Accession Number: WOS:000735162900001

Author Identifiers:

eISSN: 2079-9292

Record 23 of 318

Title: Numerical study and improvement of the dynamic performance of dilation x-ray imager

Author(s): Wang, QQ (Wang, Qiangqiang); Cao, ZR (Cao, Zhurong); Chen, T (Chen, Tao); Deng, B (Deng, Bo); Deng, KL (Deng, Keli); Tian, JS (Tian, Jinshou)

Source: REVIEW OF SCIENTIFIC INSTRUMENTS  Volume: 92  Issue: 12  Article Number: 123305  DOI: 10.1063/5.0061685  Published: DEC 1 2021  

Abstract: We present in this Note a numerical study on the dynamic performance of a Dilation X-ray Imager (DIXI). The DIXI including a photoelectron tube (PT) and a magnetic solenoid is modeled in 3D space. The initial parameters of the photoelectrons are sampled with a Monte Carlo code. The trajectories of the photoelectrons are calculated by using the particle-in-cell method, and the transit time spread (TTS) and temporal magnification are analyzed in detail. We have designed a PT with a double-microstrip structure and compared the performance of the double-microstrip PT with the traditional single-microstrip PT. The results show that the sensitivity of the TTS and the temporal magnification to the emission time of the photoelectrons can be significantly reduced by using the double-microstrip PT, resulting in an improvement of the time window. Therefore, the dynamic performance of the DIXI is improved.

Accession Number: WOS:000733061600002

PubMed ID: 34972428

Author Identifiers:

ISSN: 0034-6748

eISSN: 1089-7623

Record 24 of 318

Title: Rapid Repetition Rate Fluctuation Measurement of Soliton Crystals in a Microresonator

Author(s): Xie, P (Xie, Peng); Wang, XY (Wang, Xinyu); Wang, WQ (Wang, Weiqiang); Zhang, WF (Zhang, Wenfu); Lu, ZZ (Lu, Zhizhou); Wang, Y (Wang, Yang); Zhao, W (Zhao, Wei)

Source: JOVE-JOURNAL OF VISUALIZED EXPERIMENTS  Issue: 178  Article Number: e60689  DOI: 10.3791/60689  Published: DEC 2021  

Abstract: Temporal solitons have attracted great interest in the past decades for their behavior in a steady state, where the dispersion is balanced by the nonlinearity in a propagation Kerr medium. The development of dissipative Kerr solitons (DKSs) in high-Q microcavities drives a novel, compact, chip-scale soliton source. When DKSs serve as femtosecond pulses, the repetition rate fluctuation can be applied to ultrahigh precision metrology, high-speed optical sampling, and optical clocks, etc. In this paper, the rapid repetition rate fluctuation of soliton crystals (SCs), a special state of DKSs where particle-like solitons are tightly packed and fully occupy a resonator, is measured based on the well-known delayed self-heterodyne method. The SCs are generated using a thermal-controlled method. The pump is a frequency fixed laser with a linewidth of 100 Hz. The integral time in frequency fluctuation measurements is controlled by the length of the delay fiber. For a SC with a single vacancy, the repetition rate fluctuations are similar to 53.24 Hz within 10 mu s and similar to 509.32 Hz within 125 mu s, respectively.

Accession Number: WOS:000802600300004

PubMed ID: 34978297

Author Identifiers:

ISSN: 1940-087X

Record 25 of 318

Title: Light-controlled pulsed x-ray tube with photocathode*

Author(s): Xuan, H (Xuan, Hao); Liu, YA (Liu, Yong-An); Qiang, PF (Qiang, Peng-Fei); Su, T (Su, Tong); Yang, XH (Yang, Xiang-Hui); Sheng, LZ (Sheng, Li-Zhi); Zhao, BS (Zhao, Bao-Sheng)

Source: CHINESE PHYSICS B  Volume: 30  Issue: 11  Article Number: 118502  DOI: 10.1088/1674-1056/abff1e  Published: DEC 2021  

Abstract: Unstable mechanical structure, low energy efficiency, and cooling requirements limit the application of conventional x-ray tubes based on filament as cathode in several academic areas. In this paper, we demonstrate a light-controlled pulsed x-ray tube using multialkali cathode as electron generator. The photocathode active area of the light controlled x-ray tube is 13.2 cm(2) (41 mm in diameter), which provides high photoelectron-emitting efficiency up to 0.288 mA/lm in 460-nm LED and 2.37-mA maximum tube current. Furthermore, the modulation ability from 1 kHz to 100 kHz of the x-ray tube is tested. The results suggest that the light-controlled pulsed x-ray tube has easy modulation and short x-ray pulse properties and is promising to be the next generation x-ray tube with wide applications in medical radiationtherapy as well as the calibration for detectors and scintillators.

Accession Number: WOS:000727700500001

Author Identifiers:

ISSN: 1674-1056

eISSN: 2058-3834

Record 26 of 318

Title: Abnormal event detection by a weakly supervised temporal attention network

Author(s): Zheng, XT (Zheng, Xiangtao); Zhang, YC (Zhang, Yichao); Zheng, YP (Zheng, Yunpeng); Luo, FL (Luo, Fulin); Lu, XQ (Lu, Xiaoqiang)

Source: CAAI TRANSACTIONS ON INTELLIGENCE TECHNOLOGY  Volume: 7  Issue: 3  Pages: 419-431  DOI: 10.1049/cit2.12068  Early Access Date: DEC 2021   Published: SEP 2022  

Abstract: Abnormal event detection aims to automatically identify unusual events that do not comply with expectation. Recently, many methods have been proposed to obtain the temporal locations of abnormal events under various determined thresholds. However, the specific categories of abnormal events are mostly neglect, which are important to help in monitoring agents to make decisions. In this study, a Temporal Attention Network (TANet) is proposed to capture both the specific categories and temporal locations of abnormal events in a weakly supervised manner. The TANet learns the anomaly score and specific category for each video segment with only video-level abnormal event labels. An event recognition module is exploited to predict the event scores for each video segment while a temporal attention module is proposed to learn a temporal attention value. Finally, to learn anomaly scores and specific categories, three constraints are considered: event category constraint, event separation constraint and temporal smoothness constraint. Experiments on the University of Central Florida Crime dataset demonstrate the effectiveness of the proposed method.

Accession Number: WOS:000724293300001

Author Identifiers:

ISSN: 2468-6557

eISSN: 2468-2322

Record 27 of 318

Title: RETRACTED: Energy Efficiency Analysis in Modified GoF Spectrum Sensing-Based AF Relay Cooperative Cognitive Sensor Network with Energy Harvesting (Retracted Article)

Author(s): Mi, Y (Mi, Yin); Lu, GY (Lu, Guangyue); Gao, WB (Gao, Wenbin)

Source: SECURITY AND COMMUNICATION NETWORKS  Volume: 2021  DOI: 10.1155/2021/3340525  Published: NOV 30 2021  

Abstract: In this paper, we propose a joint sensing duration and transmission power allocation scheme to maximize the energy efficiency (EE) of the secondary user (SU) in a cooperative cognitive sensor network (CSN). At the initial time slot of the frame, the secondary transmitter (ST) performs energy harvesting (EH) and spectrum sensing simultaneously using power splitting (PS) protocol. The modified goodness of fit (GoF) spectrum sensing algorithm is employed to detect the licensed spectrum, which is not sensitive to an inaccurate noise power estimate. Based on the imperfect sensing results, the ST will act as an amplify-and-forward (AF) relay and assist in transmission of the primary user (PU) or transmit its own data. The SU's EE maximization problem is constructed under the constraints of meeting energy causality, sensing reliability, and PU's quality of service (QoS) requirement. Since the SU's EE function is a nonconvex problem and difficult to solve, we transform the original problem into a tractable convex one with the aid of Dinkelbach's method and convex optimization technique by applying a nonlinear fractional programming. The closed-form expression of the ST's transmission power is also derived through Karush-Kuhn-Tucker (KKT) and gradient method. Simulation results show that our scheme is superior to the existing schemes.

Accession Number: WOS:000771302700006

Author Identifiers:

ISSN: 1939-0114

eISSN: 1939-0122

Record 28 of 318

Title: Impact remnants rich in carbonaceous chondrites detected on the Moon by the Chang'e-4 rover

Author(s): Yang, YZ (Yang, Yazhou); Li, S (Li, Shuai); Zhu, MH (Zhu, Meng-Hua); Liu, Y (Liu, Yang); Wu, B (Wu, Bo); Du, J (Du, Jun); Fa, WZ (Fa, Wenzhe); Xu, R (Xu, Rui); He, ZP (He, Zhiping); Wang, C (Wang, Chi); Xue, B (Xue, Bin); Yang, JF (Yang, Jianfeng); Zou, YL (Zou, Yongliao)

Source: NATURE ASTRONOMY  Volume: 6  Issue: 2  Pages: 207-+  DOI: 10.1038/s41550-021-01530-w  Early Access Date: NOV 2021   Published: FEB 2022  

Abstract: The Moon has experienced an intense bombardment history since its formation(1). Fragments of the impactor can remain on the lunar surface(2-4) and can provide evidence of the evolution of the impactor composition and impact population in the Earth-Moon system(3-5). However, the retained impactor fragments previously identified in the Apollo samples have been well mixed into bulk lunar regolith due to the subsequent impact gardening, and their properties cannot be easily isolated(3,6,7). Here we report observations of a two-metre-sized crater that formed less than one million years ago obtained by the Yutu-2 rover of Chang'e-4. Hyperspectral images in the visible and near-infrared range (0.45-0.945 mu m) with a spatial resolution less than 1 mm per pixel highlight the presence of glassy material with high concentration (47%) of carbonaceous chondrites. We identify this material as remnants of the original impactor that was not entirely vaporized by the impact. Although carbonaceous chondrite fragments have been found in Apollo samples(8,9,) no carbonaceous chondrite remnant had been directly observed on the lunar surface by remote sensing exploration. We suggest that carbonaceous chondrite-like bodies may still provide one of the sources of water to the present Moon.

Accession Number: WOS:000722538400001

Author Identifiers:

ISSN: 2397-3366

Record 29 of 318

Title: Dwarfism computer-aided diagnosis algorithm based on multimodal pyradiomics

Author(s): Qiu, S (Qiu, Shi); Jin, Y (Jin, Yi); Feng, SH (Feng, Songhe); Zhou, T (Zhou, Tao); Li, YD (Li, Yidong)

Source: INFORMATION FUSION  Volume: 80  Pages: 137-145  DOI: 10.1016/j.inffus.2021.11.012  Early Access Date: NOV 2021   Published: APR 2022  

Abstract: Dwarfism refers to the phenomenon that children with same gender and age are lower than two standard deviations of normal height in the same living environment. It is of great significance for early diagnosis and early treatment of dwarfism. Dwarfism can be divided into growth hormone deficiency (GHD) and idiopathic short stature (ISS). GHD can be distinguished by growth hormone, while ISS is difficult to distinguish because its hormone features are not obvious. Thus, a computer-aided diagnosis model based on brain image data and clinical features is established for the first time and a dwarfism prediction algorithm is proposed based on multimodal pyradiomics. Firstly, we establish the extraction of pituitary gland based on tensor and binary wavelet model, as the pituitary gland is an important organ that affects the growth hormone. Then, the multidimensional fusion model is established to distinguish dwarfism. In the process of distinguishment, the pyradiomics features and clinical features are extracted to distinguish together. Finally, dwarfism computer-aided diagnosis algorithm based on multimodal pyradiomics is realized.

Accession Number: WOS:000724320000008

ISSN: 1566-2535

eISSN: 1872-6305

Record 30 of 318

Title: Monolithic RGB Micro-Light-Emitting Diodes Fabricated with Quantum Dots Embedded inside Nanoporous GaN

Author(s): Song, J (Song, Jie); Kang, JH (Kang, Jin-ho); Han, J (Han, Jung)

Source: ACS APPLIED ELECTRONIC MATERIALS  Volume: 3  Issue: 11  Pages: 4877-4881  DOI: 10.1021/acsaelm.1c00700  Published: NOV 23 2021  

Abstract: We report the use of colloidal quantum dots (QDs) embedded in nanoporous (NP) gallium nitride (GaN) as a color converter to achieve different emission colors and fabricate micro-light-emitting diodes (micro-LEDs). The optical property of NP-GaN has been studied by analyzing the light transmittance propagating in NP-GaN. A strong light scattering effect can be induced by NP-GaN, resulting in a dramatically increased optical transmission path for blue light and high light absorption by QDs loaded inside NP-GaN. A 4 in. color converter has been achieved with a wavelength deviation of 1 nm across the entire wafer. Monolithic red, green, and blue micro-LEDs have been fabricated with a pixel size of around 35 x 35 mu m(2).

Accession Number: WOS:000756989100023

Author Identifiers:

eISSN: 2637-6113

Record 31 of 318

Title: Visual inspection system for battery screen print using joint method with multi-level block matching and K nearest neighbor algorithm

Author(s): Zhao, Z (Zhao, Zhuo); Li, B (Li, Bing); Liu, TK (Liu, Tongkun); Zhang, SJ (Zhang, Shaojie); Lu, JS (Lu, Jiasheng); Geng, LQ (Geng, Leqi); Cao, J (Cao, Jie)

Source: OPTIK  Volume: 250  Article Number: 168332  DOI: 10.1016/j.ijleo.2021.168332  Early Access Date: NOV 2021   Part: 1  Published: JAN 2022  

Abstract: To overcome the drawbacks of manual quality inspection in battery industry, an online vision system is designed for battery screen print. Defect detection technique is based on the joint method of multi-level block matching and K nearest neighbor (KNN) algorithm. Firstly, execute preprocessing to origin images in segmentation, tilt correction and region cutting; Then create block templates on print area and train the corresponding models for active shape model (ASM) and KNN methods; Finally, coarse and accurate block matchings are applied to extract print defects in subsequent stages. In this period, KNN uses shape features of region components to recheck each target block. In addition, we adopt dynamic model updating mechanism to enhance system adaptability of condition changing. The joint method has two advantages: fault detection caused by print distortion is obviously reduced; accurate defect localization is also assured. Meanwhile, system hardware and software are also developed and calibrated to support detection method. Performance comparison, recognition rate and time efficiency are validated in experiment stage. It can be concluded that the proposed method has superior performances in both simulations and industrial application.

Accession Number: WOS:000737258200005

Author Identifiers:

ISSN: 0030-4026

eISSN: 1618-1336

Record 32 of 318

Title: Direct generation of ultrafast vortex beam from a Tm:CaYAlO₄ oscillator featuring pattern matching of a folded-cavity resonator

Author(s): Cao, X (Cao, Xue); Liu, YY (Liu, Yangyu); Xian, AH (Xian, Anhua); Li, YF (Li, Yifei); Wu, K (Wu, Kun); Xu, XD (Xu, Xiaodong); Zhou, W (Zhou, Wei); Wang, HT (Wang, Haotian); Huang, HT (Huang, Haitao); Jia, BH (Jia, Baohua); Wang, YS (Wang, Yishan); Tang, DY (Tang, Dingyuan); Shen, DY (Shen, Deyuan)

Source: OPTICS EXPRESS  Volume: 29  Issue: 24  Pages: 39312-39322  DOI: 10.1364/OE.437584  Published: NOV 22 2021  

Abstract: Optical vortices, beams with spiral wavefronts and screw phase dislocations have been explored in applications in optical manipulation, quantum optics, and the next generation of optical communications. In traditional methods, optical vortices are generated using space light modulators or spiral phase plates, which would sharply decrease the integration of optical systems. Different from previous transverse mode conversion outside the cavity, here we experimentally demonstrate a direct generation of ultrafast vortex beam from a Tm:CaYAlO4 oscillator by pattern matching of a six-mirror-folded-cavity resonator. By accurately adjusted the angle of the end mirror and the distance L between the M4 and the SESAMs to control the beam diameter of laser incidence on the gain medium in the sagittal and tangential planes, a stable 2 mu m ultrafast vortex laser emission of annular Laguerre-Gaussian (LG) mode was obtained with a maximum output power of 327 mW and pulse duration of 2.1 ps. A simple YAG crystal plate was used as handedness selector and a homemade Mach-Zehnder (MZ) interferometer has verified the vortical property of the LG(01) mode. By furtherly controlling the cavity mode pattern matching, other stable transverse-mode operations for TEM00, high-order Hermite-Gaussian (HG) transverse mode and doughnut-shaped beams were successfully realized. This work provides a flexible and reliable way to generate mid-infrared ultrafast vortex beams and is of special significance for applications in the areas of molecular spectroscopy and organic material processing amongst others. (C) 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

Accession Number: WOS:000722251200032

PubMed ID: 34809298

Author Identifiers:

ISSN: 1094-4087

Record 33 of 318

Title: Partially Coherent Illumination Based Point-Diffraction Digital Holographic Microscopy Study Dynamics of Live Cells

Author(s): Zhuo, KQ (Zhuo, Kequn); Wang, Y (Wang, Yu); Wang, Y (Wang, Yang); Wen, K (Wen, Kai); Liu, M (Liu, Min); Ma, Y (Ma, Ying); Zheng, JJ (Zheng, Juanjuan); Gao, P (Gao, Peng)

Source: FRONTIERS IN PHYSICS  Volume: 9  Article Number: 796935  DOI: 10.3389/fphy.2021.796935  Published: NOV 22 2021  

Abstract: This paper presents a partially coherent point-diffraction digital holographic microscopy (PC-pDHM) prototype and demonstrates its application in label-free imaging of the dynamic processes of live cells. In PC-pDHM, the light scattered by a rotating diffuser is coupled into a multi-mode fiber, and the output light is used as the partially coherent illumination (PCI), which reduces the speckle noise significantly in PC-pDHM. A polarization-grating is used to remold the object and the reference waves, and the fringe contrast of the generated hologram can be adjusted by changing the polarization of the illumination wave. Using the PC-pDHM prototype, transparent samples and notably the dynamic processes of live cells were imaged with high contrast and in a label-free manner, discovering the pathological mechanisms of biology in the cellular and sub-cellular levels.

Accession Number: WOS:000727186100001

Author Identifiers:

ISSN: 2296-424X

Record 34 of 318

Title: Study on the Application of Super-Resolution Ultrasound for Cerebral Vessel Imaging in Rhesus Monkeys

Author(s): Yan, L (Yan, Li); Bai, C (Bai, Chen); Zheng, Y (Zheng, Yu); Zhou, XD (Zhou, Xiaodong); Wan, MX (Wan, Mingxi); Zong, YJ (Zong, Yujin); Chen, SS (Chen, Shanshan); Zhou, Y (Zhou, Yin)

Source: FRONTIERS IN NEUROLOGY  Volume: 12  Article Number: 720320  DOI: 10.3389/fneur.2021.720320  Published: NOV 17 2021  

Abstract: Background: Ultrasound is ideal for displaying intracranial great vessels but not intracranial microvessels and terminal vessels. Even with contrast agents, the imaging effect is still unsatisfactory. In recent years, significant theoretical advances have been achieved in super-resolution imaging. The latest commonly used ultrafast plane-wave ultrasound Doppler imaging of the brain and microbubble-based super-resolution ultrasound imaging have been applied to the imaging of cerebral microvessels and blood flow in small animals such as mice but have not been applied to in vivo imaging of the cerebral microvessels in monkeys and larger animals. In China, preliminary research results have been obtained using super-resolution imaging in certain fields but rarely in fundamental and clinical experiments on large animals. In recent years, we have conducted a joint study with the Xi'an Jiaotong University to explore the application and performance of this new technique in the diagnosis of cerebrovascular diseases in large animals.Objective: To explore the characteristics and advantages of microbubble-based super-resolution ultrasound imaging of intracranial vessels in rhesus monkeys compared with conventional transcranial ultrasound.Methods: First, the effectiveness and feasibility of the super-resolution imaging technique were verified by modular simulation experiments. Then, the imaging parameters were adjusted based on in vitro experiments. Finally, two rhesus monkeys were used for in vivo experiments of intracranial microvessel imaging.Results: Compared with conventional plane-wave imaging, super-resolution imaging could measure the inner diameters of cerebral microvessels at a resolution of 1 mm or even 0.7 mm and extract blood flow information. In addition, it has a better signal-to-noise ratio (5.625 dB higher) and higher resolution (~30-fold higher). The results of the experiments with rhesus monkeys showed that microbubble-based super-resolution ultrasound imaging can achieve an optimal resolution at the micron level and an imaging depth >35 mm.Conclusion: Super-resolution imaging can realize the monitoring imaging of high-resolution and fast calculation of microbubbles in the process of tissue damage, providing an important experimental basis for the clinical application of non-invasive transcranial ultrasound.

Accession Number: WOS:000725749000001

PubMed ID: 34867712

Author Identifiers:

ISSN: 1664-2295

Record 35 of 318

Title: A large dispersion-managed monolithic all-fiber chirped pulse amplification system for high-energy femtosecond laser generation

Author(s): Li, F (Li, Feng); Zhao, W (Zhao, Wei); Wang, YS (Wang, Yishan); Wang, N (Wang, Na); Li, QL (Li, Qianglong); Yang, Y (Yang, Yang); Wen, WL (Wen, Wenlong)

Source: OPTICS AND LASER TECHNOLOGY  Volume: 147  Article Number: 107684  DOI: 10.1016/j.optlastec.2021.107684  Early Access Date: NOV 2021   Published: MAR 2022  

Abstract: A high energy monolithic all fiber chirped pulse amplification (CPA) system composed of fiber-silicate glass fiber is demonstrated in this work. In this compact system, the optical stretcher consists of two large dispersion chirped fiber Bragg gratings that offer a high stretch ratio to lower the nonlinearity that accumulates in the fiber amplifier. By employing high gain silicate glass fiber with a length of 20 cm as the main amplifier, an optimal balance of pulse energy and the B-integral is achieved. An amplified power of 42.6 W, corresponding to a pulse energy of 213 mu J, is obtained with an injection power of 100 mW. After compression, the laser pulses are compressed by a novel polarization-controlled double-pass configuration of a chirped volume Bragg grating (CVBG) to match the dispersion of the fiber stretcher. A total compression efficiency of 79.8% is obtained. The dispersion between the stretcher and the compressor is matched with the self-made temperature tuning device of the fiber grating. An optimized pulse width of 781 fs and a pulse energy of 170 mu J are obtained with the single mode beam profile. To the best of our knowledge, this is the highest energy ever obtained with a single-mode beam profile for a spliced monolithic all-fiber CPA system. This compact high-energy fiber system will be useful in scientific research and industrial applications.

Accession Number: WOS:000724478500004

Author Identifiers:

ISSN: 0030-3992

eISSN: 1879-2545

Record 36 of 318

Title: Spectral Characteristics of Fiber-Based S-Shape Taper Refractometer With High Sensitivity

Author(s): Ma, JW (Ma, Jianwen); Cheng, HH (Cheng, Haihao); Yang, XM (Yang, Xuemei); Zhang, SY (Zhang, Songyang); Li, YQ (Li, Yongqi); Wang, S (Wang, Shun); Wu, S (Wu, Shun)

Source: IEEE PHOTONICS TECHNOLOGY LETTERS  Volume: 33  Issue: 22  Pages: 1266-1269  DOI: 10.1109/LPT.2021.3115955  Published: NOV 15 2021  

Abstract: In this work, we have experimentally demonstrated the refractive index (RI) sensing characteristics of a S-shape taper refractometer (STR) based on modal interference theory. Our preliminary theoretical analysis reveals that there exists a critical cladding mode, which is essential for understanding the sensing characteristics. When the dominant cladding mode involved in a core-cladding interference is close to the critical cladding mode, the resulting RI sensitivity tends to reach a maximum value. Moreover, both the critical and the dominant cladding mode are dependent on ambient RI. Our sensor achieves a high RI sensitivity of 2109.7 nm/RIU for a transmission dip at around 1505 nm with a measurement range of 1.36 to 1.39.

Accession Number: WOS:000704821300001

Author Identifiers:

ISSN: 1041-1135

eISSN: 1941-0174

Record 37 of 318

Title: Method to Improve the Detection Accuracy of Quadrant Detector Based on Neural Network

Author(s): Wang, X (Wang, Xuan); Su, XQ (Su, Xiuqin); Liu, GZ (Liu, Guizhong); Han, JF (Han, Junfeng); Zhu, WH (Zhu, Wenhua); Liu, ZX (Liu, Zengxin)

Source: IEEE PHOTONICS TECHNOLOGY LETTERS  Volume: 33  Issue: 22  Pages: 1254-1257  DOI: 10.1109/LPT.2021.3116240  Published: NOV 15 2021  

Abstract: The quadrant detector (QD), has developed into a core detector in the free space optical communication system. The light power received by the detector surface will be very weak after long distance transmission of laser, it brings great challenges to the high precision spot position detection of the detector. Therefore, this letter proposes a method to improve the spot position detection accuracy of the QD through artificial neural network. The neural network can solve the impact of multiple different factors on the detection accuracy of the detector at one time, which can save a lot of time and cost. Moreover, the test results of the detection accuracy of the network show that the neural network has significantly improved the detection accuracy of the spot position of the QD.

Accession Number: WOS:000704108500005

Author Identifiers:

ISSN: 1041-1135

eISSN: 1941-0174

Record 38 of 318

Title: Analogous Optical Activity in Free Space Using a Single Pancharatnam-Berry Phase Element

Author(s): Liu, S (Liu, Sheng); Qi, SX (Qi, Shuxia); Li, P (Li, Peng); Wei, BY (Wei, Bingyan); Chen, P (Chen, Peng); Hu, W (Hu, Wei); Zhang, Y (Zhang, Yi); Gan, XT (Gan, Xuetao); Zhang, P (Zhang, Peng); Lu, YQ (Lu, Yanqing); Chen, ZG (Chen, Zhigang); Zhao, JL (Zhao, Jianlin)

Source: LASER & PHOTONICS REVIEWS  Volume: 16  Issue: 1  Article Number: 2100291  DOI: 10.1002/lpor.202100291  Early Access Date: NOV 2021   Published: JAN 2022  

Abstract: It is commonly believed that optical activity (OA) is manifested mainly in chiral media, but rare in non-chiral structures. Here, an analog of OA in free space is experimentally demonstrated by using a single liquid-crystal Pancharatnam-Berry phase element (PBPE), for which the mechanism is highly consistent with that of the traditional OA. The specifically designed PBPE supports the direction-dependent polarization rotation of a Bessel beam with controllable "rotatory power." Such a polarization rotation can be revoked by another PBPE with the same structure. Unlike in a chiral medium, this scheme shows simultaneous realization of equivalent leverotation and dextorotation merely by switching the optical element orientation, promising for applications non-magnetic optical devices such as optical isolators.

Accession Number: WOS:000718008000001

Author Identifiers:

ISSN: 1863-8880

eISSN: 1863-8899

Record 39 of 318

Title: Axial resolution enhancement for planar Airy beam light-sheet microscopy via the complementary beam subtraction method

Author(s): Liu, C (Liu, Chao); Yu, XH (Yu, Xianghua); Bai, C (Bai, Chen); Li, X (Li, Xing); Zhou, Y (Zhou, Yuan); Yan, SH (Yan, Shaohui); Min, JW (Min, Junwei); Dan, D (Dan, Dan); Li, RZ (Li, Runze); Gu, SY (Gu, Shuangyu); Yao, BL (Yao, Baoli)

Source: APPLIED OPTICS  Volume: 60  Issue: 32  Pages: 10239-10245  DOI: 10.1364/AO.441070  Published: NOV 10 2021  

Abstract: Airy beam light-sheet illumination can extend the field of view (FOV) of light-sheet fluorescence microscopy due to the unique propagation properties of non-diffraction and self-acceleration. However, the side lobes create undesirable out-of-focus background, leading to poor axial resolution and low image contrast. Here, we propose an Airy complementary beam subtraction (ACBS) method to improve the axial resolution while keeping the extended FOV. By scanning the optimized designed complementary beam that has two main lobes (TML), the generated complementary light-sheet has almost identical intensity distribution to that of the planar Airy light-sheet except for the central lobe. Subtraction of the two images acquired by double exposure respectively using the planar Airy light-sheet and the planar TML light-sheet can effectively suppress the influence of the out-of-focus background. The axial resolution improves from similar to 4 mu m to 1.2 mu m. The imaging performance was demonstrated by imaging specimens of aspergillus conidiophores and GFP labeled mouse brain section. The results show that the ACBS method enables the Airy beam light-sheet fluorescence microscopy to obtain better imaging quality. (C) 2021 Optical Society of America

Accession Number: WOS:000717521700030

PubMed ID: 34807133

Author Identifiers:

ISSN: 1559-128X

eISSN: 2155-3165

Record 40 of 318

Title: A synchroscan streak tube with high deflection sensitivity

Author(s): Liu, XL (Liu Xue-Ling); Tian, JS (Tian Jin-Shou); Tian, LP (Tian Li-Ping); Chen, P (Chen Ping); Zhang, MR (Zhang Min-Rui); Xue, YH (Xue Yan-Hua); Li, YH (Li Ya-Hui); Fang, YM (Fang Yu-Man); Xu, XY (Xu Xiang-Yan); Liu, BY (Liu Bai-Yu); Gou, YS (Gou Yong-Sheng)

Source: ACTA PHYSICA SINICA  Volume: 70  Issue: 21  Article Number: 218502  DOI: 10.7498/aps.70.20210814  Published: NOV 5 2021  

Abstract: A synchroscan streak tube with high spatiotemporal resolution and high deflection sensitivity is proposed, which contains several innovation designs. Some measures are taken to improve the imaging performances of the streak tube. Firstly, in order to obtain a high deflection sensitivity, the difference in voltage between the photocathode and anode and the length of the equipotential region of the streak tube are reduced as much as possible. Secondly, by introducing a hyperfine grid behind the cathode, reasonably designing the voltages applied to the six-electrode electrostatic focusing system, and moving the electron beam crossing point to the entrance of the deflection plates, the temporal dispersion and the temporal distortion of the streak tube are reduced, and the spatiotemporal resolution of the streak tube is improved. Besides, the streak tube is technically analyzed by tracking the temporal and spatial distribution of electrons under an operating voltage of 7000 V with the aid of computer simulation technology (CST) software. The results show that the deflection sensitivity is 125 mm/kV, the physical temporal resolution is better than 1.83 ps @MTF = 10%, and the static spatial resolution on the photocathode is better than 38 lp/mm @MTF = 10% over the effective photocathode area with a size of 10 mm x 4 mm. By applying a synchronous scanning voltage with a repetition frequency of 250 MHz to the deflection electrode, the results show that the dynamic spatial resolution of the streak tube is better than 16 lp/mm, the limit of the dynamic temporal resolution is 1.39 ps, and two rectangular electron pulses with a size of 10 mm x 20 mu m and an interval of 2.3 ps emitted from the photocathode can be well resolved by the streak tube. In addition, the experimental measurements are conducted with a streak tube developed in our laboratory. The results demonstrate that the photocathode of the streak tube can work in the entire visible light region, and the response in the short wavelength region is significantly better than that in the long wavelength region. The static spatial resolution of this streak tube is 40 lp/mm in the center of the photocathode. The temporal resolution of this streak tube is 5.55 ps measured under a synchronous scanning voltage with a repetition frequency of 75 MHz.

Accession Number: WOS:000716870500008

Author Identifiers:

ISSN: 1000-3290

Record 41 of 318

Title: Analysis of a higher-energy structure in nanotip enhanced fields

Author(s): Gao, XZ (Gao, Xu-Zhen); Landsman, AS (Landsman, Alexandra S.); Wang, HS (Wang, Hushan); Huang, P (Huang, Pei); Zhang, YP (Zhang, Yanpeng); Wang, B (Wang, Bo); Wang, YS (Wang, Yishan); Cao, HB (Cao, Huabao); Fu, YX (Fu, Yuxi); Pi, LW (Pi, Liang-Wen)

Source: NEW JOURNAL OF PHYSICS  Volume: 23  Issue: 11  Article Number: 113017  DOI: 10.1088/1367-2630/ac320c  Published: NOV 2021  

Abstract: We investigate strong field ionization of an atomic gas in a plasmonically enhanced field resulting from the illumination of a nanometer-sized structure with ultrafast laser pulse. We use perturbation theory to derive an approximate solution for electron's motion following ionization. These analytical estimates are corroborated by the time-dependent Schrodinger equation and classical trajectory Monte Carlo simulations. Notably, our approach can be used to obtain electron energy spectra without having to rely on numerical simulations. This allows for a deeper study of the dependence of electron energy spectrum on the properties of the near-field, suggesting electric field sensor applications. We derive an analytical expression for the location of the peak of the higher-energy structure (HES) as a function of laser parameters and near-field decay length. We find a particularly strong dependence of the energy peak on laser frequency, with lower frequencies causing a significant upward shift in the final electron energies. Combined with control of the width of the HES, which can be done by changing the size of the nanostructure, this points to the possibility of using nanotips as sources of ultrashort electron beams of tunable energy.

Accession Number: WOS:000716132600001

Author Identifiers:

ISSN: 1367-2630

Record 42 of 318

Title: High-throughput fast full-color digital pathology based on Fourier ptychographic microscopy via color transfer

Author(s): Gao, YT (Gao, Yuting); Chen, JR (Chen, Jiurun); Wang, AY (Wang, Aiye); Pan, A (Pan, An); Ma, CW (Ma, Caiwen); Yao, BL (Yao, Baoli)

Source: SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY  Volume: 64  Issue: 11  Article Number: 114211  DOI: 10.1007/s11433-021-1730-x  Published: NOV 2021  

Abstract: The usage of full-color imaging in digital pathology produces significant results. Compared with a grayscale image or a pseudocolor image containing contrast information, a full-color image can identify and detect the target object better with color texture information. Fourier ptychographic microscopy (FPM) is a high-throughput computational imaging technique that breaks the tradeoff between high resolution (HR) and a large field of view. It also eliminates the artifacts of scanning and stitching in digital pathology and improves its imaging efficiency. However, the conventional full-color digital pathology based on FPM is still time-consuming because of the repeated experiments with tri-wavelengths. A color transfer FPM approach termed "CFPM" was reported. The color texture information of a low-resolution full-color pathologic image is directly transferred to the HR grayscale FPM image captured by only a single wavelength. Both of the color space of FPM based on the standard CIE-XYZ color model and the display based on the standard RGB color space were established. Different FPM colorization schemes were analyzed and compared with 30 biological samples. Three types of evaluation approaches were provided, including the root-mean-square error (RMSE), the difference maps, and the image histogram cosine similarity. The average RMSE values of the conventional method and CFPM compared with the ground truth were 5.3% and 5.7%, respectively. Therefore, the reconstruction time is significantly reduced by 2/3 with the sacrifice of precision of only 0.4%. The CFPM method is also compatible with advanced fast FPM approaches to further reduce computation time.

Accession Number: WOS:000682673300001

Author Identifiers:

ISSN: 1674-7348

eISSN: 1869-1927

Record 43 of 318

Title: Ultra-Broadband Polarization Conversion Metasurface with High Transmission for Efficient Multi-Functional Wavefront Manipulation in the Terahertz Range

Author(s): Jiang, XQ (Jiang, Xiaoqiang); Fan, WH (Fan, Wenhui); Qin, C (Qin, Chong); Chen, X (Chen, Xu)

Source: NANOMATERIALS  Volume: 11  Issue: 11  Article Number: 2895  DOI: 10.3390/nano11112895  Published: NOV 2021  

Abstract: Recently, terahertz (THz) wireless communication has been widely investigated as the future prospect of wireless network architecture. However, most of the natural existing materials are inapplicable for THz devices, which hinder their further development. To promote the integration and channel capacity of the THz wireless communication systems, an ultrabroadband polarization conversion metasurface for efficient multi-functional wavefront manipulation is proposed. The designed metasurface is composed of an arrow-type structure sandwiched by a pair of orthogonal gratings, which can induce the Fabry-Perot-like cavity for improving the transmission. Simulated results indicate that the transmission coefficient of the cross-polarization metasurface is higher than 90% from 0.73 THz to 2.24 THz, and the corresponding polarization conversion ratio is greater than 99.5%. Moreover, the phase coverage of 0-2 pi at operation frequency can be easily obtained by altering the geometric parameter of the metasurface. To demonstrate the concept of wavefront manipulation, anomalous refraction, focusing metalens, and vortex beam generation are investigated in detail. All of these applications exhibit a remarkable performance of the proposed metasurface that has great potential in prompting the efficient, broadband and compact systems for THz wireless communication.

Accession Number: WOS:000727288400001

PubMed ID: 34835660

Author Identifiers:

eISSN: 2079-4991

Record 44 of 318

Title: Off-axis optical levitation and transverse spinning of metallic microparticles

Author(s): Liang, YS (Liang, Yansheng); Yan, SH (Yan, Shaohui); Wang, ZJ (Wang, Zhaojun); Yao, BL (Yao, Baoli); Lei, M (Lei, Ming)

Source: PHOTONICS RESEARCH  Volume: 9  Issue: 11  Pages: 2144-2151  DOI: 10.1364/PRJ.431413  Published: NOV 1 2021  

Abstract: Optical manipulation of metallic microparticles remains a significant challenge because of the strong scattering forces arising from the high extinction coefficient of the particles. This paper reports a new mechanism for stable confinement of metallic microparticles using a tightly focused linearly polarized Gaussian beam. Theoretical and experimental results demonstrate that metallic microparticles can be captured off the optical axis in such a beam. Meanwhile, the three-dimensionally confined particles are observed spinning transversely as a response to the asymmetric force field. The off-axis levitation and transverse spinning of metallic micropartides may provide a new way for effective manipulation of metallic micropartides. (C) 2021 Chinese Laser Press

Accession Number: WOS:000713930800002

Author Identifiers:

ISSN: 2327-9125

Record 45 of 318

Title: Ultrafast photonics applications of zirconium carbide as a novel mode-locker for fiber lasers

Author(s): Liu, SC (Liu, Sicong); Lv, RD (Lv, Ruidong); Wang, J (Wang, Jiang); Wang, YS (Wang, Yishan); Wang, HS (Wang, Hushan); Zhang, H (Zhang, Han); Wang, YG (Wang, Yonggang)

Source: JOURNAL OF MATERIALS CHEMISTRY C  Volume: 9  Issue: 47  Pages: 16985-16990  DOI: 10.1039/d1tc04073a  Early Access Date: NOV 2021   Published: DEC 9 2021  

Abstract: Zirconium carbide (ZrC), as a novel member of the MXene family, has outstanding physical and chemical properties; however, the applications of ZrC in ultrafast photonics are still rare. Herein, a ZrC film was deposited by magnetron sputtering deposition (MSD) technology onto a D-shaped fiber and the nonlinear optical properties of the ZrC film were demonstrated. MSD technology is an advanced preparation method applicable to various materials. The saturation intensity and the modulation depth of the ZrC film were measured to be 197.6 MW cm(-2) and 11.9%, respectively. After inserting the ZrC SA into an erbium-doped fiber laser (EDFL) cavity, a passive mode-locked EDFL pulse was formed. In mode-locked operation, conventional solitons with an ultrashort pulse duration of 395 fs and an output power of 49.86 mW were achieved in the communication band. The corresponding central wavelength of the output spectrum was 1562.19 nm with a 7.73 nm spectral width. This work pioneers the application of a ZrC-based device as a mode-locker to achieve ultrashort pulses for the first time and expands the application of the ZrC material. The experimental results open new opportunities for the use of ZrC in mode-locked lasers and photonics applications.

Accession Number: WOS:000719960600001

Author Identifiers: