Record 1 of 210

Title: Generation of single-cycle mid-infrared pulses via coherent synthesis

Author(s): Ma, F (Ma, Fen); Liu, HJ (Liu, Hongjun); Huang, N (Huang, Nan); Sun, QB (Sun, Qibing)

Source: OPTICS EXPRESS  Volume: 20  Issue: 27  Pages: 28455-28464  DOI: 10.1364/OE.20.028455  Published: DEC 17 2012  

Abstract: A new approach for the generation of single-cycle mid-infrared pulses without complicated control systems is proposed, which is based on direct coherent synthesis of two idlers generated by difference frequency generation (DFG) processes. It is found that the waveform of synthesized pulses is mainly determined by the spectra superposition, the carrier-envelope phase (CEP) difference, the relative timing and the chirp ratio between the idlers. The influences of these parameters on the synthesized waveform are also numerically calculated and analyzed via second-order autocorrelation, which offers general guidelines for the waveform optimization. The single-cycle synthesized mid-infrared pulses, which are centered at 4233 nm with the spectrum spanning from 3000 nm to 7000 nm, are achieved by carefully optimizing these parameters. The single-cycle mid-infrared laser source presents the possibility of investigating and controlling the strong field light-matter interaction. (C) 2012 Optical Society of America

Accession Number: WOS:000314911400051

PubMed ID: 23263081

Author Identifiers:

ISSN: 1094-4087

Record 2 of 210

Title: Unclassical ripple patterns in single-crystal silicon produced by femtosecond laser irradiation

Author(s): Zhang, W (Zhang, Wei); Cheng, GG (Cheng, Guanghua); Feng, Q (Feng, Qiang)

Source: APPLIED SURFACE SCIENCE  Volume: 263  Pages: 436-439  DOI: 10.1016/j.apsusc.2012.09.075  Published: DEC 15 2012  

Abstract: Laser-induced periodic surface structures (LIPSS) in single-crystal silicon upon irradiation with multiple linearly polarized femtosecond (fs) laser pulses (120 fs, 800 nm, 1 kHz) were investigated under different laser fluence and pulse number. Unclassical ripples (U-ripples), which were nearly parallel to the polarization of the laser beam, were observed to form gradually on the top of classical ripples with the effective pulse number. Their periods were significantly longer than the laser wavelength, and increased with increasing both the laser fluence and pulse number in the current study. The relationship between the types of ripple patterns and their parametric dependence was established. The mechanism of U-ripple formation was attributed to the capillary wave, arising from the inhomogeneous temperature gradient combined with the electric field of the pulses in the molten surface layer. (C) 2012 Elsevier B. V. All rights reserved.

Accession Number: WOS:000311217500070

ISSN: 0169-4332

eISSN: 1873-5584

Record 3 of 210

Title: A new design of large area MCP-PMT for the next generation neutrino experiment

Author(s): Wang, YF (Wang, Yifang); Qian, S (Qian, Sen); Zhao, T (Zhao, T.); Tian, JS (Tian, Jinshou); Li, HR (Li, Huirui); Cao, J (Cao, Jun); Xu, XY (Xu, Xiangyan); Wang, XY (Wang, Xiaoyun); Liu, SD (Liu, Shudong); Liu, HL (Liu, Hulin); Liu, SL (Liu, Shulin); Liu, DL (Liu, Delin); Heng, YK (Heng, Yuekun); Cao, XB (Cao, Xibin); Jun, ST (Jun Shentu)

Source: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT  Volume: 695  Pages: 113-117  DOI: 10.1016/j.nima.2011.12.085  Published: DEC 11 2012  

Abstract: This manuscript discusses a new design of large area MCP-PMT for the next generation neutrino experiments. The main motivation of the design is to improve the quantum efficiency (photo detection efficiency) of the PMT. Two sets of small MCP units, the transmission photocathode coated on the front hemisphere and the reflection photocathode coated on the rear hemisphere are assembled in the same glass envelope to form nearly 4 pi viewing angle to enhance the efficiency of the photoelectron detection. The photoelectrons from the 4 pi photocathode are collected and amplified by two sets of MCP units. Our goal is eventually to produce 20 in. diameter PMT following such an approach. We will report preliminary results of our ptoelectronic simulation and the results of a 5 in. diameter prototype PMT. Future plans and prospects are discussed at the end. (C) 2011 Elsevier B.V. All rights reserved.

Accession Number: WOS:000311469900022

Conference Title: International Conference on New Developments In Photodetection-NDIP11

Conference Date: JUL 04-08, 2011

Conference Location: Lyon, FRANCE

Author Identifiers:

ISSN: 0168-9002

eISSN: 1872-9576

Record 4 of 210

Title: High-peak-power, single-mode, nanosecond pulsed, all-fiber laser for high resolution 3D imaging LIDAR system

Author(s): Yun, J (Yun, Jian); Gao, CX (Gao, Cunxiao); Zhu, SL (Zhu, Shaolan); Sun, CD (Sun, Chuandong); He, HD (He, Haodong); Feng, L (Feng, Li); Dong, LJ (Dong, Lijun); Niu, LQ (Niu, Linquan)

Source: CHINESE OPTICS LETTERS  Volume: 10  Issue: 12  Article Number: 121402  DOI: 10.3788/COL201210.121402  Published: DEC 10 2012  

Abstract: This study presents an eye-safe, single-mode, nanosecond-pulsed, and all-fiber laser source with master-oscillator-power-amplifier configuration at 1 550 nm that is suitable for high-resolution three-dimensional (3D) imaging light detection and ranging (LIDAR) system. The output peak power of 7.6 kW is obtained at the 1.2-ns pulse width and 50-kHz repetition rate. The single-mode pulse laser output ensures the range precision and imaging results of the LIDAR system. The laser is used as a transmitter for the 3D imaging LIDAR system. The detailed characteristics of the LIDAR system and the results of the 3D imaging are presented.

Accession Number: WOS:000313022000012

Author Identifiers:

ISSN: 1671-7694

Record 5 of 210

Title: Observations of three types of sidebands in a passively mode-locked soliton fiber laser

Author(s): Han, DD (Han, D. D.); Yun, L (Yun, L.)

Source: LASER PHYSICS  Volume: 22  Issue: 12  Pages: 1837-1841  DOI: 10.1134/S1054660X12120092  Published: DEC 2012  

Abstract: We have experimentally observed three types of sidebands in a passively mode-locked soliton fiber laser with large anomalous dispersion for the first time to our best knowledge. By appropriately adjusting the polarization state of laser cavity, the conventional peak sidebands, peak-dip sidebands, and dip sidebands appear in the soliton spectra, respectively. The peak-dip and dip sidebands exhibit distinct characteristics from the conventional peak sidebands. The formation mechanism of the new type sidebands can be attributed to the periodic power variation. This work could help to a deeper insight of the spectrum shaping mechanism of conventional solitons.

Accession Number: WOS:000312063600015

ISSN: 1054-660X

eISSN: 1555-6611

Record 6 of 210

Title: Dispersion-free quantum clock synchronization via fiber link

Author(s): Hou, FY (Hou, Fei-yan); Dong, RF (Dong, Rui-fang); Quan, RA (Quan, Run-ai); Zhang, Y (Zhang, Yu); Bai, Y (Bai, Yun); Liu, T (Liu, Tao); Zhang, SG (Zhang, Shou-gang); Zhang, TY (Zhang, Tong-yi)

Source: ADVANCES IN SPACE RESEARCH  Volume: 50  Issue: 11  Pages: 1489-1494  DOI: 10.1016/j.asr.2012.07.029  Published: DEC 1 2012  

Abstract: We proposed a fiber-based quantum clock synchronization protocol by employing the dispersion cancellation feature of the frequency anti-correlated entangled source under the quantum interference measurement. It is shown that, the accuracy of the synchronization is mainly dependent on the bandwidth of the frequency entangled biphoton spectrum and on the temperature variation induced fluctuations in both the reference fiber coiling and the fiber link. With this proposal, synchronization between two clocks at a distance of ten kilometers can be implemented with an accuracy below a picosecond. (C) 2012 COSPAR. Published by Elsevier Ltd. All rights reserved.

Accession Number: WOS:000310389600005

Author Identifiers:

ISSN: 0273-1177

eISSN: 1879-1948

Record 7 of 210

Title: Synthesis of two benzo[1,2-b:3,4-b′]dithiophene-based conjugated polymers with different side chains and their applications in photovoltaic devices

Author(s): Qu, B (Qu, Bo); Yang, HS (Yang, Hongsheng); Tian, D (Tian, Di); Liu, HL (Liu, Hongli); Cong, ZY (Cong, Zhiyuan); Gao, C (Gao, Chao); Chen, ZJ (Chen, Zhijian); Xiao, LX (Xiao, Lixin); Gao, Z (Gao, Zhi); Wei, W (Wei, Wei); Gong, QH (Gong, Qihuang)

Source: SYNTHETIC METALS  Volume: 162  Issue: 23  Pages: 2020-2026  DOI: 10.1016/j.synthmet.2012.09.009  Published: DEC 2012  

Abstract: Two D-A conjugated polymers (named PBDTC6BT and PBDTC10DBT) with benzo[1,2-b:3,4-b']thiophene (BDT) as donor and 4,7-dithiophen-2,1,3-benzothiadiazole (DBT) as acceptor, were designed and synthesized. PBDTC6DBT and PBDTC10DBT have hexyl and decyl as side chains in the DBT units, respectively. The polymers were characterized by spectroscopic (NMR and UV-vis) methods, GPC, DSC and cyclic voltammetry. In order to study the photovoltaic properties of the two conjugated polymers, photovoltaic devices with the configuration of ITO/poly(3,4-ehylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS)/polymer:[6,6]-phenyl C-61-butyric acid methyl ester (PC61BM)/LiF/Al, were fabricated, in which PBDTC6DBT or PBDTC10DBT acted as electron donor in active layers. According to the experimental data, when the blend ratio of PBDTC6DBT and PC61 BM reached 1:2, the best photovoltaic properties among the PBDTC6DBT-based devices were obtained, and the open-circuit voltage, the short-circuit current density and the power conversion efficiency were measured to be 0.63 V, 6.18 mA/cm(2) and 1.86%, respectively. As to PBDTC10DBT-based devices, the maximum of power conversion efficiency reached 0.99% with the blend ratio of PBDTC10DBT and PC61BM being 1:2. PBDTC10DBT and PBDTC6DBT were both promising donor candidates in the application of polymer solar cells. (C) 2012 Elsevier B.V. All rights reserved,

Accession Number: WOS:000313401300005

Author Identifiers:

ISSN: 0379-6779

Record 8 of 210

Title: Multivariate Multilinear Regression

Author(s): Su, Y (Su, Ya); Gao, XB (Gao, Xinbo); Li, XL (Li, Xuelong); Tao, DC (Tao, Dacheng)

Source: IEEE TRANSACTIONS ON SYSTEMS MAN AND CYBERNETICS PART B-CYBERNETICS  Volume: 42  Issue: 6  Pages: 1560-1573  DOI: 10.1109/TSMCB.2012.2195171  Published: DEC 2012  

Abstract: Conventional regression methods, such as multivariate linear regression (MLR) and its extension principal component regression (PCR), deal well with the situations that the data are of the form of low-dimensional vector. When the dimension grows higher, it leads to the under sample problem (USP): the dimensionality of the feature space is much higher than the number of training samples. However, little attention has been paid to such a problem. This paper first adopts an in-depth investigation to the USP in PCR, which answers three questions: 1) Why is USP produced? 2) What is the condition for USP, and 3) How is the influence of USP on regression. With the help of the above analysis, the principal components selection problem of PCR is presented. Subsequently, to address the problem of PCR, a multivariate multilinear regression (MMR) model is proposed which gives a substitutive solution to MLR, under the condition of multilinear objects. The basic idea of MMR is to transfer the multilinear structure of objects into the regression coefficients as a constraint. As a result, the regression problem is reduced to find two low-dimensional coefficients so that the principal components selection problem is avoided. Moreover, the sample size needed for solving MMR is greatly reduced so that USP is alleviated. As there is no closed-form solution for MMR, an alternative projection procedure is designed to obtain the regression matrices. For the sake of completeness, the analysis of computational cost and the proof of convergence are studied subsequently. Furthermore, MMR is applied to model the fitting procedure in the active appearance model (AAM). Experiments are conducted on both the carefully designed synthesizing data set and AAM fitting databases verified the theoretical analysis.

Accession Number: WOS:000311353700005

PubMed ID: 22677310

Author Identifiers:

ISSN: 1083-4419

eISSN: 1941-0492

Record 9 of 210

Title: Age-related changes in prostate zonal volumes as measured by high-resolution magnetic resonance imaging (MRI): a cross-sectional study in over 500 patients

Author(s): Turkbey, B (Turkbey, Baris); Huang, R (Huang, Robert); Vourganti, S (Vourganti, Srinivas); Trivedi, H (Trivedi, Hari); Bernardo, M (Bernardo, Marcelino); Yan, P (Yan, Pingkun); Benjamin, C (Benjamin, Compton); Pinto, PA (Pinto, Peter A.); Choyke, PL (Choyke, Peter L.)

Source: BJU INTERNATIONAL  Volume: 110  Issue: 11  Pages: 1642-1647  DOI: 10.1111/j.1464-410X.2012.11469.x  Published: DEC 2012  

Abstract: OBJECTIVE
To use ability of magnetic resonance imaging (MRI) to investigate age-related changes in zonal prostate volumes.
PATIENTS AND METHODS
This Institutional Review Board approved, Health Insurance Portability and Accountability Act-compliant study consisted of 503 patients who underwent 3 T prostate MRI before any treatment for prostate cancer.
Whole prostate (WP) and central gland (CG) volumes were manually contoured on T2-weighted MRI using a semi-automated segmentation tool. WP, CG, peripheral zone (PZ) volumes were measured for each patient.
WP, CG, PZ volumes were correlated with age, serum prostate-specific antigen (PSA) level, International Prostate Symptom Score (IPSS), Sexual Health Inventory for Men (SHIM) scores.
RESULTS
Linear regression analysis showed positive correlations between WP, CG volumes and patient age (P < 0.001); there was no correlation between age and PZ volume (P= 0.173).
There was a positive correlation between WP, CG volumes and serum PSA level (P < 0.001), as well as between PZ volume and serum PSA level (P= 0.002).
At logistic regression analysis, IPSS positively correlated with WP, CG volumes (P < 0.001).
SHIM positively correlated with WP (P= 0.015) and CG (P= 0.023) volumes.
As expected, the IPSS of patients with prostate volumes (WP, CG) in first decile for age were significantly lower than those in tenth decile.
CONCLUSIONS
Prostate MRI is able to document age-related changes in prostate zonal volumes.
Changes in WP and CG volumes correlated inversely with changes in lower urinary tract symptoms.
These findings suggest a role for MRI in measuring accurate prostate zonal volumes; have interesting implications for study of age-related changes in the prostate.

Accession Number: WOS:000312245900018

PubMed ID: 22973825

Author Identifiers:

ISSN: 1464-4096

Record 10 of 210

Title: Die Bonding of High Power 808 nm Laser Diodes With Nanosilver Paste

Author(s): Yan, Y (Yan, Yi); Chen, X (Chen, Xu); Liu, XS (Liu, Xingsheng); Mei, YH (Mei, Yunhui); Lu, GQ (Lu, Guo-Quan)

Source: JOURNAL OF ELECTRONIC PACKAGING  Volume: 134  Issue: 4  Article Number: 041003  DOI: 10.1115/1.4007271  Published: DEC 2012  

Abstract: Conduction-cooled high power laser diodes have a variety of significant commercial, industrial, and military applications. For these devices to perform effectively, an appropriate die-attached material meeting specific requirements must be selected. In this study, nanosilver paste, a novel die-attached material, was used in packaging the 60 W 808 nm high power laser diodes. The properties of the laser diodes operating in the continuous wave (CW) mode, including the characteristics of power-current-voltage (LIV), spectrum, near field, far field, near field linearity, spatial spectrum, and thermal impedance, were determined. In addition, destructive tests, including the die shear test, scanning acoustic microscopy, and the thermal rollover test, were conducted to evaluate the reliability of the die bonding of the 60 W 808 nm high power semiconductor laser with nanosilver paste. Thermal analyses of the laser diodes operating at CW mode with different die-attached materials, indium solder, gold-tin solder and nanosilver paste, were conducted by finite element analysis (FEA). According to the result of the FEA, the nanosilver paste resulted in the lowest temperature in the laser diodes. The test results showed that the nanosilver paste was a very promising die-attached material in packaging high power semiconductor laser. [DOI: 10.1115/1.4007271]

Accession Number: WOS:000313031000003

Author Identifiers:

ISSN: 1043-7398

eISSN: 1528-9044

Record 11 of 210

Title: Sideband-controllable mode-locking fiber laser based on chirped fiber Bragg gratings

Author(s): Han, DD (Han, Dongdong); Liu, XM (Liu, Xueming)

Source: OPTICS EXPRESS  Volume: 20  Issue: 24  Pages: 27045-27050  DOI: 10.1364/OE.20.027045  Published: NOV 19 2012  

Abstract: We have proposed a sideband-controllable fiber soliton laser by means of chirped fiber Bragg gratings (CFBGs). Each side of the spectral sidebands of laser could be removed by using a CFBG with proper dispersion. Numerical simulations have well reproduced the experimental observations. The numerical and experimental investigations show that the generation of the unilateral sidebands is attributed to the CFBG-induced spectral filtering effect. Our work provides an effective way to manage conventional solitons with spectral sidebands. (C) 2012 Optical Society of America

Accession Number: WOS:000312452800095

PubMed ID: 23187560

Author Identifiers:

ISSN: 1094-4087

Record 12 of 210

Title: Virtual source for an Airy beam

Author(s): Yan, SH (Yan, Shaohui); Yao, BL (Yao, Baoli); Lei, M (Lei, Ming); Dan, D (Dan, Dan); Yang, YL (Yang, Yanlong); Gao, P (Gao, Peng)

Source: OPTICS LETTERS  Volume: 37  Issue: 22  Pages: 4774-4776  DOI: 10.1364/OL.37.004774  Published: NOV 15 2012  

Abstract: We identify a virtual source for generating an Airy wave. A spectral integral expression is derived to describe the Airy wave, which, in the paraxial limit, yields the freely accelerating, nondiffracting, and finite energy Airy beam. From the spectral representation of the Airy wave, the first two orders of nonparaxial corrections to the paraxial Airy beam are determined. Also, a connection between the obtained Airy wave and the well-known complex source point spherical wave is given. (C) 2012 Optical Society of America

Accession Number: WOS:000311169800070

PubMed ID: 23164909

Author Identifiers:

ISSN: 0146-9592

Record 13 of 210

Title: Portable fiber group velocity test method with a gain-switched laser

Author(s): Feng, Y (Feng, Ye); Zou, L (Zou, Lin); Wang, YS (Wang, Yi Shan); Zhao, W (Zhao, Wei); Yang, Z (Yang, Zhi); Zhang, W (Zhang, Wei); Hu, XH (Hu, Xiao Hong)

Source: APPLIED OPTICS  Volume: 51  Issue: 32  Pages: 7745-7749  DOI: 10.1364/AO.51.007745  Published: NOV 10 2012  

Abstract: A portable method of group velocity measurement is proposed based on a self-seeded gain-switched laser. The calculated group velocity in the optical fiber is obtained by measuring the round-trip frequencies of the gain-switched laser diode with different external cavities, and only a 2 m long fiber is needed. The measurement can be accomplished without oscilloscope or optical spectrum analyzer. The error associated with this test is within 0.65%, which is limited by the jitter of the voltage-controlled oscillator. Its spectrum resolution is 0.1 nm. (C) 2012 Optical Society of America

Accession Number: WOS:000311084300003

PubMed ID: 23142884

Author Identifiers:

ISSN: 1559-128X

eISSN: 2155-3165

Record 14 of 210

Title: Three-dimensional reconstruction of laser-imploded targets from simulated pinhole images

Author(s): Xu, P (Xu, Peng); Bai, YL (Bai, Yonglin); Bai, XH (Bai, Xiaohong); Liu, BY (Liu, Baiyu); Ouyang, X (Ouyang, Xian); Wang, B (Wang, Bo); Yang, WZ (Yang, Wenzheng); Gou, YS (Gou, Yongsheng); Zhu, BL (Zhu, Bingli); Qin, JJ (Qin, Junjun)

Source: APPLIED OPTICS  Volume: 51  Issue: 32  Pages: 7820-7825  DOI: 10.1364/AO.51.007820  Published: NOV 10 2012  

Abstract: This paper proposes an integral method to achieve a more accurate weighting matrix that makes very positive contributions to the image reconstruction in inertial confinement fusion research. Standard algebraic reconstruction techniques with a positivity constraint included are utilized. The final normalized mean-square error between the simulated and reconstructed projection images is 0.000365%, which is a nearly perfect result, indicating that the weighting matrix is very important. Compared with the error between the simulated and reconstructed phantoms, which is 2.35%, it seems that the improvement of the accuracy of the projection image does not mean the improvement of the phantom. The proposed method can reconstruct a simulated laser-imploded target consisting of 100 x 100 x 100 voxels. (C) 2012 Optical Society of America

Accession Number: WOS:000311084300014

PubMed ID: 23142895

Author Identifiers:

ISSN: 1559-128X

eISSN: 2155-3165

Record 15 of 210

Title: Tunable high-channel-count bandpass plasmonic filters based on an analogue of electromagnetically induced transparency

Author(s): Lu, H (Lu, Hua); Liu, XM (Liu, Xueming); Wang, GX (Wang, Guoxi); Mao, D (Mao, Dong)

Source: NANOTECHNOLOGY  Volume: 23  Issue: 44  Article Number: 444003  DOI: 10.1088/0957-4484/23/44/444003  Published: NOV 9 2012  

Abstract: We have proposed a novel type of bandpass plasmonic filter consisting of metal-insulator-metal bus waveguides coupled with a series of side-coupled cavities and stub waveguides. The theoretical modeling demonstrates that our waveguide-resonator system performs a plasmonic analogue of electromagnetically induced transparency (EIT) in atomic systems, as is confirmed by numerical experiments. The plasmonic EIT-like response enables the realization of nanoscale bandpass filters with multiple channels. Additionally, the operating wavelengths and bandwidths of our filters can be efficiently tuned by adjusting the geometric parameters such as the lengths of stub waveguides and the coupling distances between the cavities and stub waveguides. The ultracompact configurations contribute to the achievement of wavelength division multiplexing systems for optical computing and communications in highly integrated optical circuits.

Accession Number: WOS:000310574700004

PubMed ID: 23079958

Author Identifiers:

ISSN: 0957-4484

eISSN: 1361-6528

Record 16 of 210

Title: Numerical investigation of an all-optical switch in a graded nonlinear plasmonic grating

Author(s): Wang, GX (Wang, Guoxi); Lu, H (Lu, Hua); Liu, XM (Liu, Xueming); Gong, YK (Gong, Yongkang)

Source: NANOTECHNOLOGY  Volume: 23  Issue: 44  Article Number: 444009  DOI: 10.1088/0957-4484/23/44/444009  Published: NOV 9 2012  

Abstract: We have proposed and numerically investigated an all-optical switch based on a metal-insulator-metal waveguide with graded nonlinear plasmonic gratings. The influences of grating depth and refractive index of a Kerr nonlinear medium on the transmission of the switch are exactly analyzed by utilizing transmission line theory. The finite-difference time-domain simulation results show that the highly compact structure possesses excellent switch function by tuning the incident electric field intensity. In addition, the simulation results show that this all-optical switch has an ultrawide operating frequency regime and femtosecond-scale response time (similar to 130 fs). Such a switch can find potential applications for all-optical signal processing and optical communication.

Accession Number: WOS:000310574700010

PubMed ID: 23080383

Author Identifiers:

ISSN: 0957-4484

eISSN: 1361-6528

Record 17 of 210

Title: Optical bistability based on an analog of electromagnetically induced transparency in plasmonic waveguide-coupled resonators

Author(s): Cui, YD (Cui, Yudong); Zeng, C (Zeng, Chao)

Source: APPLIED OPTICS  Volume: 51  Issue: 31  Pages: 7482-7486  DOI: 10.1364/AO.51.007482  Published: NOV 1 2012  

Abstract: We have investigated numerically an optical bistability effect based on an analog of electromagnetically induced transparency (EIT) in a nanoscale plasmonic waveguide-coupled resonator system. The system consists of a metal-insulator-metal waveguide side-coupled with a slot cavity and a nanodisk cavity containing Kerr nonlinear material. By finite-difference time-domain simulations, the EIT-like spectral peak has a redshift with an increase of the dielectric constant of the nanodisk cavity. More importantly, we have achieved an optical bistability with threshold intensity about three times lower than that of recent literature [Appl. Opt. 50, 5287 (2011)]. The results show that our plasmonic structure can find more excellent application in highly integrated optical circuits, especially all-optical switching. (C) 2012 Optical Society of America

Accession Number: WOS:000310640800008

PubMed ID: 23128694

Author Identifiers:

ISSN: 1559-128X

eISSN: 2155-3165

Record 18 of 210

Title: Switchable mode-locking fiber laser with fiber Bragg gratings

Author(s): Han, DD (Han, Dongdong)

Source: OPTICAL ENGINEERING  Volume: 51  Issue: 11  Article Number: 114202  DOI: 10.1117/1.OE.51.11.114202  Published: NOV 2012  

Abstract: A switchable mode-locking fiber laser is proposed by means of fiber Bragg grating (FBG). The FBG plays two key roles, the switchable wavelength operation and the spectral filtering effect, on the proposed laser. The switchable single-wavelength mode-locking operation, lasing at either 1545.25 or 1548.34 nm, corresponding to the central wavelengths of the FBGs, is obtained by appropriately rotating the polarization controllers (PC). In addition, the dual-wavelength mode-locking operation is observed with proper PC state. The switchable mode-locking operation attributes to the wavelength-dependent loss mechanism and the spectral filter formed by PCs and FBGs. (C) 2012 Society of Photo-Optical Instrumentation Engineers (SPIE). [DOI: 10.1117/1.OE.51.11.114202]

Accession Number: WOS:000314462100035

ISSN: 0091-3286

eISSN: 1560-2303

Record 19 of 210

Title: A probabilistic model for image representation via multiple patterns

Author(s): Li, J (Li, Jun); Tao, DC (Tao, Dacheng); Li, XL (Li, Xuelong)

Source: PATTERN RECOGNITION  Volume: 45  Issue: 11  Pages: 4044-4053  DOI: 10.1016/j.patcog.2012.04.021  Published: NOV 2012  

Abstract: For image analysis, an important extension to principal component analysis (PCA) is to treat an image as multiple samples, which helps alleviate the small sample size problem. Various schemes of transforming an image to multiple samples have been proposed. Although having been shown effective in practice, the schemes are mainly based on heuristics and experience.
In this paper, we propose a probabilistic PCA model, in which we explicitly represent the transformation scheme and incorporate the scheme as a stochastic component of the model. Therefore fitting the model automatically learns the transformation. Moreover, the learned model allows us to distinguish regions that can be well described by the PCA model from those that need further treatment. Experiments on synthetic images and face data sets demonstrate the properties and utility of the proposed model. (C) 2012 Elsevier Ltd. All rights reserved.

Accession Number: WOS:000306584200015

Author Identifiers:

ISSN: 0031-3203

eISSN: 1873-5142

Record 20 of 210

Title: RETRACTED: Monomode optical planar and channel waveguides in Yb<SUP>3+</SUP>-doped silicate glasses formed by helium ion implantation (Retracted Article)

Author(s): Liu, CX (Liu, Chun-Xiao); Cheng, S (Cheng, Shu); Zhao, JH (Zhao, Jin-Hua); Li, WN (Li, Wei-Nan); Wei, W (Wei, Wei); Peng, B (Peng, Bo)

Source: OPTICS AND LASER TECHNOLOGY  Volume: 44  Issue: 8  Pages: 2323-2326  DOI: 10.1016/j.optlastec.2012.04.033  Published: NOV 2012  

Abstract: We report on the fabrication of optical planar and channel waveguides in Yb3+-doped silicate glasses by triple-energy helium ion implantation at a total dose of 6 x 10(16) ions/cm(2). The dark mode spectroscopy of the planar waveguide was measured using a prism coupling arrangement. The near-field mode profiles of the planar and channel waveguides were obtained with an end-face coupling system. The refractive index profile was reconstructed using the intensity calculation method. The results indicate that a refractive index enhanced region as well as an optical barrier has been created after the beam process. After post-implantation treatments at 260 degrees C for 1 h and 310 degrees C for 30 min, the channel waveguides possessed a propagation loss of similar to 0.9 dB/cm. The acceptable guiding properties suggest that further waveguide lasers may be realized on the He-implanted Yb3+-doped silicate glass waveguides. (c) 2012 Elsevier Ltd. All rights reserved.

Accession Number: WOS:000305371900001

ISSN: 0030-3992

eISSN: 1879-2545

Record 21 of 210

Title: Experimental study on the imaging of the squeezed-state light with a virtual object

Author(s): Lu, BZ (Lu, Baozhu); Bi, SW (Bi, Siwen); Feng, F (Feng, Fei); Kang, MH (Kang, Menghua); Qin, F (Qin, Fei)

Source: OPTICAL ENGINEERING  Volume: 51  Issue: 11  Article Number: 119001  DOI: 10.1117/1.OE.51.11.119001  Published: NOV 2012  

Abstract: A stable amplitude squeezed-state light was generated by utilizing the nondegenerate optical parametric amplifier based on periodically poled KTiOPO4 crystal at 1064 nm. We observed -4.93 dB of squeezing with a local oscillator phase locked in homodyne measurement. The imaging experiments of the resolution target have shown that the imaging resolution, which was based on squeezed-state light, is 1.41 times as much as the resolution that was acquired using coherent light as light source. In addition, the squeezed-state light was applied for imaging of the virtual object. It was found that the characters on the board were much more easily discerned with squeezed light as a light source than with coherent light. This result paves the way for further improvements of imaging resolution by use of the squeezed-state light. (C) 2012 Society of Photo-Optical Instrumentation Engineers (SPIE). [DOI: 10.1117/1.OE.51.11.119001]

Accession Number: WOS:000314462100063

Author Identifiers:

ISSN: 0091-3286

Record 22 of 210

Title: Modeling and testing of static pressure within an optical fiber cable spool using distributed fiber Bragg gratings

Author(s): Ma, CJ (Ma, Chengju); Ren, LY (Ren, Liyong); Qu, ES (Qu, Enshi); Tang, F (Tang, Feng); Liang, Q (Liang, Quan)

Source: OPTICS COMMUNICATIONS  Volume: 285  Issue: 24  Pages: 4949-4953  DOI: 10.1016/j.optcom.2012.07.064  Published: NOV 1 2012  

Abstract: Based on the force analysis, we establish a theoretical model to study the static pressure distribution of the fiber cable spool for the fiber optic guided missile (FOG-M). Simulations indicate that for each fiber layer in the fiber cable spool, the applied static pressure on it asymptotically converges as the number of fiber layers increases. Using the distributed fiber Bragg grating (FBG) sensing technique, the static pressure of fiber cable layers in the spool on the cable winding device was measured. Experiments show that the Bragg wavelength of FBG in every layer varies very quickly at the beginning and then becomes gently as the subsequent fiber cable was twisted onto the spool layer by layer. Theoretical simulations agree qualitatively with experimental results. This technology provides us a real-time method to monitor the pressure within the fiber cable layer during the cable winding process. (C) 2012 Elsevier B.V. All rights reserved.

Accession Number: WOS:000311196500040

Author Identifiers:

ISSN: 0030-4018

eISSN: 1873-0310

Record 23 of 210

Title: A copolymer based on benzo[1,2-b:4,5-b′]dithiophene and quinoxaline derivative for photovoltaic application

Author(s): Wu, HM (Wu, Haimei); Qu, B (Qu, Bo); Cong, ZY (Cong, Zhiyuan); Liu, HL (Liu, Hongli); Tian, D (Tian, Di); Gao, BW (Gao, Bowen); An, ZW (An, Zhongwei); Gao, C (Gao, Chao); Xiao, LX (Xiao, Lixin); Chen, ZJ (Chen, Zhijian); Liu, HH (Liu, Huanhuan); Gong, QH (Gong, Qihuang); Wei, W (Wei, Wei)

Source: REACTIVE & FUNCTIONAL POLYMERS  Volume: 72  Issue: 11  Pages: 897-903  DOI: 10.1016/j.reactfunctpolym.2012.07.006  Published: NOV 2012  

Abstract: A D-A-D copolymer (PBDTQx) with a bandgap of 1.78 eV, containing alkoxy-substituted benzo[1,2-b:4,5-b']dithiophene (BDT) as donor and quinoxaline derivative (Qx) as acceptor, was synthesized by Stille coupling reaction. In order to study the photovoltaic property of PBDTQx, polymer solar cells (PSCs) were fabricated with PBDTQx as the electron donor blended with [6,6]-phenyl-C61-butyric acid methyl ester (PC61 BM) as the electron acceptor. The power conversion efficiency (PCE) of PSC was 1.01% for an optimized PBDTQx: PC61 BM ratio of 1:5, under the illumination of AM 1.5, 100 mW/cm(2). The results indicated that PBDTQx was a promising donor candidate in the application of polymer solar cells. (C) 2012 Elsevier Ltd. All rights reserved.

Accession Number: WOS:000309622100014

Author Identifiers:

ISSN: 1381-5148

eISSN: 1873-166X

Record 24 of 210

Title: Comparison of end-pumped and multi-point pumped Yb<SUP>3+</SUP>-doped gain guided and index antiguided fiber laser

Author(s): Wu, JW (Wu, Jingwei); Zhou, EY (Zhou, Enyu); Yan, KL (Yan, Kunlun); Wei, W (Wei, Wei); Peng, B (Peng, Bo)

Source: OPTICS AND LASER TECHNOLOGY  Volume: 44  Issue: 8  Pages: 2371-2376  DOI: 10.1016/j.optlastec.2012.04.014  Published: NOV 2012  

Abstract: End-pumped and multi-point pumped Yb3+-doped gain guided and index antiguided (GG+IAG) fiber laser are analyzed by solving the rate equations and 3-D thermal conduction equations. Simulation results show that the multi-point pumped scheme can provide lower operating temperature and better temperature uniformity. Meanwhile, fabrication complexity, loss resulted from pump point should be taken into consideration in the practical design. Crown Copyright (c) 2012 Published by Elsevier Ltd. All rights reserved.

Accession Number: WOS:000305371900009

Author Identifiers:

ISSN: 0030-3992

eISSN: 1879-2545

Record 25 of 210

Title: Can Fixed Time Delay Signature be Concealed in Chaotic Semiconductor Laser With Optical Feedback?

Author(s): Wu, Y (Wu, Yuan); Wang, YC (Wang, Yun-Cai); Li, P (Li, Pu); Wang, AB (Wang, An-Bang); Zhang, MJ (Zhang, Ming-Jiang)

Source: IEEE JOURNAL OF QUANTUM ELECTRONICS  Volume: 48  Issue: 11  Pages: 1371-1379  DOI: 10.1109/JQE.2012.2212001  Published: NOV 2012  

Abstract: External-cavity lasers are usually used for chaos encryption in optical chaos-based communication systems. The external-cavity round-trip time (the time delay in the laser dynamics) is often regarded as an additional key to encode messages, which is a critical security parameter. The feasibility of identifying the time delay has been a crucial issue in chaotic optical communication. Some researchers propose that the time delay can be hidden by modulating the value of feedback strength or increasing the number of feedback cavities. In this paper, we experimentally and numerically demonstrate that the time delay signatures cannot be concealed in optical feedback semiconductor lasers. Whether single or double optical feedback, the time delay signatures can all be identified by the power spectrum analysis method. Furthermore, adjusting the feedback strength, the pumping current and the time-delay value, we find that the extraction of the time delay signatures still cannot be influenced.

Accession Number: WOS:000315455500001

Author Identifiers:

ISSN: 0018-9197

eISSN: 1558-1713

Record 26 of 210

Title: Creation of periodic subwavelength ripples on tungsten surface by ultra-short laser pulses

Author(s): Xue, L (Xue, Lu); Yang, JJ (Yang, Jianjun); Yang, Y (Yang, Yang); Wang, YS (Wang, Yishan); Zhu, XN (Zhu, Xiaonong)

Source: APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING  Volume: 109  Issue: 2  Pages: 357-365  DOI: 10.1007/s00339-012-7261-3  Published: NOV 2012  

Abstract: Formation of periodic subwavelength ripples on a metallic tungsten surface is investigated through a line-scribing method under the irradiation of 800 nm, 50 fs to 8 ps ultra-short laser pulses. The distinctive features of the induced ripple structures are described in detail with different laser parameters. Experimental measurements reveal that with gradual decrease of the laser fluence, the pulse duration or the scanning speed, the ripple period is inclined to reduce but the ripple depth tends to become pronounced. Theoretical analyses suggest that the transient dielectric function change of the tungsten surface mainly originates from the nonequilibrium distribution of electrons due to the d-band transitions. A sandwich-like physical model of air-plasma-target is proposed and the excitation of a surface plasmon polaritonic (SPP) wave is supposed to occur on the interface between the metallic target and the electron plasma layer. Formation of ripples can be eventually attributed to the laser-SPP interference. Theoretical interpretations are consistent with the experimental observations.

Accession Number: WOS:000310240900017

ISSN: 0947-8396

eISSN: 1432-0630

Record 27 of 210

Title: Soliton mode locking fiber laser with an all-fiber polarization interference filter

Author(s): Yan, ZJ (Yan, Zhijun); Wang, HS (Wang, Hushan); Zhou, KM (Zhou, Kaiming); Wang, YS (Wang, Yishan); Li, C (Li, Cheng); Zhao, W (Zhao, Wei); Zhang, L (Zhang, Lin)

Source: OPTICS LETTERS  Volume: 37  Issue: 21  Pages: 4522-4524  DOI: 10.1364/OL.37.004522  Published: NOV 1 2012  

Abstract: l An erbium doped fiber ring laser achieving soliton mode locking by the use of an intra-cavity all-fiber polarization interference filter (AFPIF) has been demonstrated. To incorporate an AFPIF with relative narrow transmission bandwidth, the laser has produced clean soliton pulses of 1.2 ps duration at a repetition rate of 14.98 MHz with a polarization extinction ratio up to 25.7 dB. Moreover, we have demonstrated that the operating wavelength of the mode locking laser can be tuned over 20 nm range from 1545 to 1565 nm by thermally tuning the AFPIF cavity. (C) 2012 Optical Society of America

Accession Number: WOS:000310577700057

PubMed ID: 23114350

Author Identifiers:

ISSN: 0146-9592

Record 28 of 210

Title: Evolution of dual-wavelength fiber laser from continuous wave to soliton pulses

Author(s): Yun, L (Yun, Ling); Han, DD (Han, Dongdong)

Source: OPTICS COMMUNICATIONS  Volume: 285  Issue: 24  Pages: 5406-5409  DOI: 10.1016/j.optcom.2012.07.114  Published: NOV 1 2012  

Abstract: Evolution of dual-wavelength fiber laser from continuous wave to soliton pulses is investigated experimentally by using the nonlinear polarization rotation technique. With the increase of pump power, the proposed laser successively delivers the dual-wavelength continuous wave, the single-wavelength soliton pulses, and the dual-wavelength soliton pulses. The dual-wavelength laser operates at the central wavelengths of about 1533 and 1546 nm with the separation of similar to 13 nm. The number of soliton pulses operating in the dual-wavelength state is much larger than that of the single-wavelength state, while the pulse intensity always keeps constant. Experimental results reveal that the dual-wavelength mode locking is determined by the combination of pump strength and the cavity filtering effect. (C) 2012 Elsevier B.V. All rights reserved.

Accession Number: WOS:000311196500117

Author Identifiers:

ISSN: 0030-4018

eISSN: 1873-0310

Record 29 of 210

Title: Single Image Super-Resolution With Non-Local Means and Steering Kernel Regression

Author(s): Zhang, KB (Zhang, Kaibing); Gao, XB (Gao, Xinbo); Tao, DC (Tao, Dacheng); Li, XL (Li, Xuelong)

Source: IEEE TRANSACTIONS ON IMAGE PROCESSING  Volume: 21  Issue: 11  Pages: 4544-4556  DOI: 10.1109/TIP.2012.2208977  Published: NOV 2012  

Abstract: Image super-resolution (SR) reconstruction is essentially an ill-posed problem, so it is important to design an effective prior. For this purpose, we propose a novel image SR method by learning both non-local and local regularization priors from a given low-resolution image. The non-local prior takes advantage of the redundancy of similar patches in natural images, while the local prior assumes that a target pixel can be estimated by a weighted average of its neighbors. Based on the above considerations, we utilize the non-local means filter to learn a non-local prior and the steering kernel regression to learn a local prior. By assembling the two complementary regularization terms, we propose a maximum a posteriori probability framework for SR recovery. Thorough experimental results suggest that the proposed SR method can reconstruct higher quality results both quantitatively and perceptually.

Accession Number: WOS:000310140700005

PubMed ID: 22829403

Author Identifiers:

ISSN: 1057-7149

eISSN: 1941-0042

Record 30 of 210

Title: Terahertz and mid-infrared spectroscopy of benzene-1,2-diol

Author(s): Zheng, ZP (Zheng, Zhuan-Ping); Fan, WH (Fan, Wen-Hui); Yan, H (Yan, Hui); Liu, J (Liu, Jia); Yang, WZ (Yang, Wen-Zheng); Zhu, SL (Zhu, Shao-Lan)

Source: JOURNAL OF MOLECULAR SPECTROSCOPY  Volume: 281  Pages: 13-17  DOI: 10.1016/j.jms.2012.09.005  Published: NOV 2012  

Abstract: The terahertz (THz) and mid-infrared (MIR) spectra of benzene-1,2-diol in the solid state have been modeled by density functional theory (DFT). Calculations of the vibrational spectra based on the optimized geometries provided a good fit to the observed spectra, and a more reasonable spectral reproduction has been achieved than those in previous work. For THz spectrum, the simulation based on the varied unit cell dimension has clearly shown that THz spectral reproduction is affected by the temperature change of unit cell. For MIR spectrum, band assignments are reported in terms of potential-energy distribution (PED). which differ to those previously reported for benzene-1,2-diol in some respects. (c) 2012 Elsevier Inc. All rights reserved.

Accession Number: WOS:000311771200004

Author Identifiers:

ISSN: 0022-2852

eISSN: 1096-083X

Record 31 of 210

Title: Theoretical analysis of output performance of GG-IAG fiber laser by multipoint distributed side pump

Author(s): Zhu, YG (Zhu, Yonggang); Duan, KL (Duan, Kailiang); Shao, HM (Shao, Hongmin); Zhao, BY (Zhao, Baoyin); Zhang, ET (Zhang, Entao); Zhao, W (Zhao, Wei)

Source: OPTICS COMMUNICATIONS  Volume: 285  Issue: 24  Pages: 5359-5363  DOI: 10.1016/j.optcom.2012.08.019  Published: NOV 1 2012  

Abstract: Based on a steady-state rate equations (REs) and heat dissipation model considering both convective and radiative heat transfer, the output performance and temperature distribution of Yb3+ doped gain guided and index antiguided (GG-IAG) fiber lasers by multipoint distributed pumping are analyzed by numerically solving REs. The results show that high output power and even temperature distribution can be obtained by increasing pump points and lowering the losses at the points; multipoint side pumping is an optimal method to obtain compact high power GG-IAG fiber lasers. The numerical analysis provides some insights for the construction of high power GG-IAG fiber lasers. (C) 2012 Elsevier B.V. All rights reserved.

Accession Number: WOS:000311196500107

Author Identifiers:

ISSN: 0030-4018

eISSN: 1873-0310

Record 32 of 210

Title: Fluorescence volume imaging with an axicon: simulation study based on scalar diffraction method

Author(s): Zheng, JJ (Zheng, Juanjuan); Yang, YL (Yang, Yanlong); Lei, M (Lei, Ming); Yao, BL (Yao, Baoli); Gao, P (Gao, Peng); Ye, T (Ye, Tong)

Source: APPLIED OPTICS  Volume: 51  Issue: 30  Pages: 7236-7245  DOI: 10.1364/AO.51.007236  Published: OCT 20 2012  

Abstract: In a two-photon excitation fluorescence volume imaging (TPFVI) system, an axicon is used to generate a Bessel beam and at the same time to collect the generated fluorescence to achieve large depth of field. A slice-by-slice diffraction propagation model in the frame of the angular spectrum method is proposed to simulate the whole imaging process of TPFVI. The simulation reveals that the Bessel beam can penetrate deep in scattering media due to its self-reconstruction ability. The simulation also demonstrates that TPFVI can image a volume of interest in a single raster scan. Two-photon excitation is crucial to eliminate the signals that are generated by the side lobes of Bessel beams; the unwanted signals may be further suppressed by placing a spatial filter in the front of the detector. The simulation method will guide the system design in improving the performance of a TPFVI system. (C) 2012 Optical Society of America

Accession Number: WOS:000310430900015

PubMed ID: 23089777

Author Identifiers:

ISSN: 1559-128X

eISSN: 2155-3165

Record 33 of 210

Title: Proton-implanted optical planar waveguides in Yb<SUP>3+</SUP>-doped silicate glasses

Author(s): Liu, CX (Liu, Chun-Xiao); Cheng, S (Cheng, Shu); Guo, HT (Guo, Hai-Tao); Li, WN (Li, Wei-Nan); Liu, XH (Liu, Xiu-Hong); Wei, W (Wei, Wei); Peng, B (Peng, Bo)

Source: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS  Volume: 289  Pages: 18-21  DOI: 10.1016/j.nimb.2012.08.004  Published: OCT 15 2012  

Abstract: We report on the characterization of planar waveguides in Yb3+-doped silicate glasses fabricated by double-energy proton implantation at a total dose of 3 x 10(16) ions/cm(2). The dark mode spectroscopy and near-field mode profile were evaluated by the prism coupling and end-face coupling methods, respectively. The results indicate that a refractive index enhanced region as well as an optical barrier has been created after the beam process. We propose the ion exchange mechanism between the proton and Na+ ions to illustrate the optical barrier and discuss its influence. (C) 2012 Elsevier B.V. All rights reserved.

Accession Number: WOS:000310765500003

Author Identifiers:

ISSN: 0168-583X

eISSN: 1872-9584

Record 34 of 210

Title: Spoof four-wave mixing for all-optical wavelength conversion

Author(s): Gong, YK (Gong, Yongkang); Huang, JG (Huang, Jungang); Li, K (Li, Kang); Copner, N (Copner, Nigel); Martinez, JJ (Martinez, J. J.); Wang, LR (Wang, Leirang); Duan, T (Duan, Tao); Zhang, WF (Zhang, Wenfu); Loh, WH (Loh, W. H.)

Source: OPTICS EXPRESS  Volume: 20  Issue: 21  Pages: 24030-24037  DOI: 10.1364/OE.20.024030  Published: OCT 8 2012  

Abstract: We present for the first time an all-optical wavelength conversion (AOWC) scheme supporting modulation format independency without requiring phase matching. The new scheme is named "spoof" four wave mixing (SFWM) and in contrast to the well-known FWM theory, where the induced dynamic refractive index grating modulates photons to create a wave at a new frequency, the SFWM is different in that the dynamic refractive index grating is generated in a nonlinear Bragg Grating (BG) to excite additional reflective peaks at either side of the original BG bandgap in reflection spectrum. This fundamental difference enable the SFWM to avoid the intrinsic shortcoming of stringent phase matching required in the conventional FWM, and allows AOWC with modulation format transparency and ultrabroad conversion range, which may have great potential applications for next generation of all-optical networks. (C) 2012 Optical Society of America

Accession Number: WOS:000309955100110

PubMed ID: 23188370

Author Identifiers:

ISSN: 1094-4087

Record 35 of 210

Title: Finger capacitance of a terahertz photomixer in low-temperature-grown GaAs using the finite element method

Author(s): Chen, LC (Chen Long-Chao); Fan, WH (Fan Wen-Hui)

Source: CHINESE PHYSICS B  Volume: 21  Issue: 10  Article Number: 104101  DOI: 10.1088/1674-1056/21/10/104101  Published: OCT 2012  

Abstract: Interdigitated finger capacitance of a continuous-wave terahertz photomixer is calculated using the finite element method. For the frequently used electrode width (0.2 mu m) and gap width (1.8 mu m), the finger capacitance increases quasi-quadratically with the number of electrodes increasing. The quasi-quadratic dependence can be explained by a sequence of lumped capacitors connected in parallel. For a photomixer composed of 10 electrodes and 9 photoconductive gaps, the finger capacitance increases as the gap width increases at a small electrode width, and follows the reverse trend at a large electrode width. For a constant electrode width, the finger capacitance first decreases and then slightly increases as the gap broadens until the smallest finger capacitance is formed. We also investigate the finger capacitances at different electrode and gap configurations with the 8 mu m x 8 mu m photomixer commonly used in previous studies. These calculations lead to a better understanding of the finger capacitance affected by the finger parameters, and should lead to terahertz photomixer optimization.

Accession Number: WOS:000309817400036

Author Identifiers:

ISSN: 1674-1056

Record 36 of 210

Title: Influence of Package Structure on the Performance of the Single Emitter Diode Laser

Author(s): Li, XN (Li, Xiaoning); Zhang, YX (Zhang, Yanxin); Wang, JW (Wang, Jingwei); Xiong, LL (Xiong, Lingling); Zhang, P (Zhang, Pu); Nie, ZQ (Nie, Zhiqiang); Wang, ZF (Wang, Zhenfu); Liu, H (Liu, Hui); Liu, XS (Liu, Xingsheng)

Source: IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY  Volume: 2  Issue: 10  Pages: 1592-1599  DOI: 10.1109/TCPMT.2012.2207456  Published: OCT 2012  

Abstract: The package structure critically influences the major characteristics of semiconductor lasers, such as thermal behavior, output power, wavelength, and far-field distribution. In this paper, a new single emitter package structure called F-mount is designed and compared with the conventional package structure C-mount. The influence of package structure on their performances is characterized and analyzed. The thermal resistances of lasers with different package structures are calculated through simulation, and are contrasted with experimental results. Some devices are also tested for the maximum output power level. Under the continuous wave (CW) condition, the maximum power of F-mount reaches 12.6 W at 808 nm while the output power only reaches 10.9 W for C-mount. Under the condition of 0.5% duty cycle (100 mu s, 50 Hz), the catastrophic optical mirror damage level reaches 58.7 W at 74 A for F-mount, and 54.8 W at 57 A for C-mount are reported for the first time. It is experimentally found that there is an obvious wavelength difference between the two type structure lasers: about 1.37 nm in CW mode and 2.89 nm in quasi CW mode. Theoretical analysis shows that red-shift and blue-shift is a result of external strain in the package process of F-mount and C-mount, respectively. It is also found that the package structure has an effect on the divergence angle of slow axis far fields, but little impact on that of fast axis far fields. The analysis shows that package structure has a strong influence on the performance of the laser; therefore, the package should be optimized to achieve better performance for some special applications.

Accession Number: WOS:000309729400004

Author Identifiers:

ISSN: 2156-3950

eISSN: 2156-3985

Record 37 of 210

Title: Image encryption based on the random rotation operation in the fractional Fourier transform domains

Author(s): Liu, ZJ (Liu, Zhengjun); Li, S (Li, She); Yang, M (Yang, Meng); Liu, WY (Liu, Wanyu); Liu, ST (Liu, Shutian)

Source: OPTICS AND LASERS IN ENGINEERING  Volume: 50  Issue: 10  Pages: 1352-1358  DOI: 10.1016/j.optlaseng.2012.05.021  Published: OCT 2012  

Abstract: A kind of image encryption scheme is presented by using a rotation operation being regarded as the scrambling scheme of the pixels. The rotation operation is composed of rotation center, radii and angle. For the data of phase and amplitude of complex number, the rotation operation is performed with random controlling parameters iteratively. The parameters are random and serve as the key of this encryption method. Subsequently, the fractional Fourier transform is introduced to alter the values of image pixel. The process mentioned above will be achieved many times for enhancing the security of the proposed algorithm. Numerical simulation is given to demonstrate the validity and performance of the image hiding procedure. (C) 2012 Elsevier Ltd. All rights reserved.

Accession Number: WOS:000307037200001

Author Identifiers:

ISSN: 0143-8166

Record 38 of 210

Title: Optical sorting of particles by dual-channel line optical tweezers

Author(s): Ma, BH (Ma, Baiheng); Yao, BL (Yao, Baoli); Peng, F (Peng, Fei); Yan, SH (Yan, Shaohui); Lei, M (Lei, Ming); Rupp, R (Rupp, Romano)

Source: JOURNAL OF OPTICS  Volume: 14  Issue: 10  Article Number: 105702  DOI: 10.1088/2040-8978/14/10/105702  Published: OCT 2012  

Abstract: A novel configuration of dual-channel line optical tweezers with a 'Y' shape is constructed for sorting of particles within a microfluidic chip. When yeast cells with different size pass the intersection of the specially designed line optical tweezers, they are separated and transported to different channels due to a difference in the forces exerted by the line tweezers that depends on the size of the cells. The influences of some experimental conditions, such as laser power and flow velocity, on the sorting efficiency are discussed.

Accession Number: WOS:000309812400015

Author Identifiers:

ISSN: 2040-8978

eISSN: 2040-8986

Record 39 of 210

Title: Formation and evolution of passively mode-locked fiber soliton lasers operating in a dual-wavelength regime

Author(s): Mao, D (Mao, Dong); Lu, H (Lu, Hua)

Source: JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS  Volume: 29  Issue: 10  Pages: 2819-2826  DOI: 10.1364/JOSAB.29.002819  Published: OCT 2012  

Abstract: formation and evolution of dual-wavelength solitons in passively mode-locked fiber soliton lasers are investigated both numerically and experimentally. By solving the Ginzburg-Landau equation and taking the gain profile into account, mode-locked soliton emissions at 1532 and 1555 nm are achieved simultaneously. Numerical results show that the two solitons exhibit the same intensity and duration, indicating that the dual-wavelength pulses possess the soliton energy quantization effect. In the process of pulse-pulse collisions, two solitons pass through each other and maintain their properties, qualitatively distinct from single-wavelength solitons that never overlap each other. The dual-wavelength mode-locked operation evolves into single-wavelength mode locking with the decrease of the pumping strength. The dual-peak gain spectrum of erbium-doped fiber and the birefringence-induced cavity filtering effect play crucial roles in the formation of dual-wavelength solitons. Numerical results agree well with analytical solutions and experimental observations. Our study provides an optional method of measuring the fiber dispersion by means of the dual-wavelength solitons. (c) 2012 Optical Society of America

Accession Number: WOS:000309588200024

Author Identifiers:

ISSN: 0740-3224

Record 40 of 210

Title: Color-stable deep red-emitting OLEDs based on a soluble terpolyrner containing fluorene, thiophene and benzothiadiazole units

Author(s): Qu, B (Qu, Bo); Feng, LM (Feng, Limin); Yang, HS (Yang, Hongsheng); Gao, Z (Gao, Zhi); Gao, C (Gao, Chao); Chen, ZJ (Chen, Zhijian); Xiao, LX (Xiao, Lixin); Gong, QH (Gong, Qihuang)

Source: SYNTHETIC METALS  Volume: 162  Issue: 17-18  Pages: 1587-1593  DOI: 10.1016/j.synthmet.2012.06.021  Published: OCT 2012  

Abstract: A novel soluble terpolymer (P8FO-Th-BT) containing 9,9-dioctylfluorene, thiophene, and 2,1,3-benzothiadiazole units were synthesized by Still coupling reaction. The single layer and multi-layer organic light emitting diodes (OLEDs) based on P8FO-Th-BT was fabricated. A deep red-emission device with the configuration of ITO/poly(3,4-ethylenedioxythiophene)-polystyrene sulfonate (PEDOT:PSS)/P8FO-Th-BT:N,N'-di(3-methylphenyl)-N,N'-diphenyl-(1,1'-biphenyl)-4,4-diamine (TPD) (weight ratio being 1:1)/2,9-dimethyl-4,7-diphenyl-1,10-phenanthroline (BCP, 15 nm)/tris(8-hydroxyquinoline) aluminum (Alq(3), 15 nm)/LiF(5 angstrom)/Al(150 nm) was obtained, and the maximum luminance was measured to be 226 cd/m(2) at the bias voltage of 10V. The electroluminescent peak located at 708 nm, and the spectrum covered both the red and infrared regions. Moreover, the Commission International De L'Eclairage (CIE) chromaticity coordinates of the device were inalterable when the bias voltage varied, which was beneficial to the application on display. Crown Copyright (c) 2012 Published by Elsevier B.V. All rights reserved.

Accession Number: WOS:000309488200017

Author Identifiers:

ISSN: 0379-6779

Record 41 of 210

Title: Highly stable, passively mode-locked fiber laser with low pump power for subpicosecond pulse generation

Author(s): Tang, DL (Tang, Dingkang); Zhang, JG (Zhang, Jian-Guo); Liu, YS (Liu, Yuanshan)

Source: LASER PHYSICS  Volume: 22  Issue: 10  Pages: 1586-1589  DOI: 10.1134/S1054660X12100052  Published: OCT 2012  

Abstract: We present the design of highly stable, passively mode-locked fiber lasers which are based on a simple configuration and require a low pump power for the generation of optical pulses with subpicosecond pulsewidth. Our designed fiber laser uses a semiconductor saturable absorber mirror to realize the self-starting, passive mode locking at a low pump power of 29 mW, with which a stable optical pulse train is obtained at the fundamental repetition rate of 52.5 MHz and the central wavelength of 1557 nm. The output mode-locked optical pulses have a pulsewidth of 881 fs and an average output power of 1.78 mW, respectively.

Accession Number: WOS:000309480900018

Author Identifiers:

ISSN: 1054-660X

eISSN: 1555-6611

Record 42 of 210

Title: Unidirectional excitation of surface plasmon polaritons in T-shaped waveguide with nanodisk resonator

Author(s): Wang, GX (Wang, Guoxi); Lu, H (Lu, Hua)

Source: OPTICS COMMUNICATIONS  Volume: 285  Issue: 21-22  Pages: 4190-4193  DOI: 10.1016/j.optcom.2012.07.019  Published: OCT 1 2012  

Abstract: The unidirectional excitation of surface plasmon polaritons (SPPs) in a novel configuration is numerically investigated by the finite-difference time-domain method. It is found that the transmission varies periodically with the increase of distance between the nanodisk resonator and horizontal nanoslit, which can be interpreted by the interference theory. The operating wavelength of this structure can be tuned by altering the refractive index of the nanodisk resonator. This subwavelength-scale structure exhibits high transmission (similar to 58%) due to the constructive interference of the SPP modes, and thus can find important applications on the manipulation of SPP excitation in highly integrated optical circuits. (C) 2012 Elsevier B.V. All rights reserved.

Accession Number: WOS:000309081600010

Author Identifiers:

ISSN: 0030-4018

eISSN: 1873-0310

Record 43 of 210

Title: Research of the navigation accuracy for the X-ray pulsar navigation system

Author(s): Wang, P (Wang Peng); Zhao, BS (Zhao Bao-Sheng); Sheng, LZ (Sheng Li-Zhi); Hu, HJ (Hu Hui-Jun); Yan, QR (Yan Qiu-Rong)

Source: ACTA PHYSICA SINICA  Volume: 61  Issue: 20  Article Number: 209702  DOI: 10.7498/aps.61.209702  Published: OCT 2012  

Abstract: In order to improve the navigation accuracy of the X-ray pulsar navigation system, in this paper we propose a constant fraction timing method based on the low-pass filter to measure the arrival time of the X-ray pulse in X-ray pulsar navigation. According to the technical scheme, the timing accuracies and dead times of original peaking timing and the improved constant fraction timing are measured. Experimental results indicate that the timing accuracy and the dead time of the peaking timing system are 18 ns and 4750 ns, the timing accuracy and the dead time of the constant fraction timing system are 0.78 ns and 105 ns. The timing accuracy and the dead time of constant fraction timing system are significantly improved compared with those of the peaking timing system. In the X-ray pulsar navigation system, the cumulative pulse profile of the X-ray pulse is constructed in the two different timing systems through measuring the arrival time of the X-ray photon. Experimental results indicate that compared with using the peaking timing system, the cumulative pulse profile of the X-ray pulse using the improved constant fraction timing system is improved obviously, therefore, the navigation accuracy could be improved by using the constant fraction timing system.

Accession Number: WOS:000311525400079

Author Identifiers:

ISSN: 1000-3290

Record 44 of 210

Title: Influence of Ag nanoparticles on luminescent performance of SiO₂:Tb<SUP>3+</SUP> nanomaterials

Author(s): Zhang, DK (Zhang, Dekai); Hu, XY (Hu, Xiaoyun); Ji, RN (Ji, Ruonan); Zhan, SC (Zhan, Suchang); Gao, JH (Gao, Jianhua); Yan, ZY (Yan, Zhiyun); Liu, EZ (Liu, Enzhou); Fan, J (Fan, Jun); Hou, X (Hou, Xun)

Source: JOURNAL OF NON-CRYSTALLINE SOLIDS  Volume: 358  Issue: 20  Pages: 2788-2792  DOI: 10.1016/j.jnoncrysol.2012.07.004  Published: OCT 1 2012  

Abstract: Tb3+ single-doped SiO2 (SiO2:Tb3+) and Tb3+, Ag co-doped SiO2 (SiO2:Tb3+-Ag) nanostructured luminescent materials were prepared by a modified Stober method. Their microstructure and optical property were investigated using scanning electron microscopy, ultraviolet visible absorption and photoluminescence spectrophotometry. Results show that the samples are composed of well-dispersed near-spherical particles with a diameter about 50 nm, the highest fluorescence intensity is obtained when the doping concentration of Tb3+ is 4.86 mol%, the corresponding internal quantum efficiency is 13.6% and the external quantum efficiency is 8.2%. The experimental results indicate that Ag nanoparticles can greatly enhance the light absorption at 226 nm and the light emission at 543 nm of SiO2:Tb3+-Ag, and the fluorescence lifetime reduces with increasing Ag concentration in SiO2:Tb3+-Ag. Additionally, the present results indicate that fluorescence enhancement is attributed to the local field enhancement and the increased radiative decay rates induced by Ag nanoparticles. (c) 2012 Elsevier B.V. All rights reserved.

Accession Number: WOS:000309647400010

Author Identifiers:

ISSN: 0022-3093

Record 45 of 210

Title: Video super-resolution with 3D adaptive normalized convolution

Author(s): Zhang, KB (Zhang, Kaibing); Mu, GW (Mu, Guangwu); Yuan, Y (Yuan, Yuan); Gao, XB (Gao, Xinbo); Tao, DC (Tao, Dacheng)

Source: NEUROCOMPUTING  Volume: 94  Pages: 140-151  DOI: 10.1016/j.neucom.2012.03.012  Published: OCT 1 2012  

Abstract: The classic multi-image-based super-resolution (SR) methods typically take global motion pattern to produce one or multiple high-resolution (HR) versions from a set of low-resolution (LR) images. However, due to the influence of aliasing and noise, it is difficult to obtain highly accurate registration with sub-pixel accuracy. Moreover, in practical applications, the global motion pattern is rarely found in the real LR inputs. In this paper, to surmount or at least reduce the aforementioned problems, we develop a novel SR framework for video sequence by extending the traditional 2-dimentional (2D) normalized convolution (NC) to 3-dimentional (3D) case. In the proposed framework, to bypass explicit motion estimation, we estimate a target pixel by taking a weighted average of pixels from its neighborhood. We further up-scale the input video sequence in temporal dimension based on the extended 3D NC and hence more video frames can be generated. Fundamental experiments demonstrate the effectiveness of the proposed SR framework both quantitatively and perceptually. (C) 2012 Elsevier B.V. All rights reserved.

Accession Number: WOS:000307087000014

Author Identifiers:

ISSN: 0925-2312

eISSN: 1872-8286

Record 46 of 210

Title: A Slot Micro/Nano Fiber With Elliptical Low-Index Core

Author(s): Zhang, WF (Zhang, Wenfu); Mu, JW (Mu, Jian-Wei); Huang, WP (Huang, Wei-Ping); Zhao, W (Zhao, Wei)

Source: IEEE PHOTONICS JOURNAL  Volume: 4  Issue: 5  Pages: 1610-1621  DOI: 10.1109/JPHOT.2012.2212241  Published: OCT 2012  

Abstract: A slot micro/nano optical fiber with elliptical low-index core, referred to as the elliptical-slot micro/nano fiber (ESMNF), is studied systematically in great detail in this paper. It is demonstrated that the ESMNF can confine most of the light in the low-index region and hence lead to large field enhancement. Benefiting from the large low-index power confinement factor and the field enhancement, the ESMNF also yields significant nonlinearity enhancement by the proper selection of materials. In addition, large birefringence between the two fundamental polarized modes is observed, due to the breakage of the circular symmetry for the core. The nonlinearity and low-index confinement properties of a more practical elliptical-slot embedded suspended microstructure fiber are also studied.

Accession Number: WOS:000308014900002

Author Identifiers:

ISSN: 1943-0655

eISSN: 1943-0647

Record 47 of 210

Title: Target classification using SIFT sequence scale invariants

Author(s): Zhu, XF (Zhu, Xufeng); Ma, CW (Ma, Caiwen); Liu, B (Liu, Bo); Cao, XQ (Cao, Xiaoqian)

Source: JOURNAL OF SYSTEMS ENGINEERING AND ELECTRONICS  Volume: 23  Issue: 5  Pages: 633-639  DOI: 10.1109/JSEE.2012.00079  Published: OCT 2012  

Abstract: On the basis of scale invariant feature transform (SIFT) descriptors, a novel kind of local invariants based on SIFT sequence scale (SIFT-SS) is proposed and applied to target classification. First of all, the merits of using an SIFT algorithm for target classification are discussed. Secondly, the scales of SIFT descriptors are sorted by descending as SIFT-SS, which is sent to a support vector machine (SVM) with radial based function (RBF) kernel in order to train SVM classifier, which will be used for achieving target classification. Experimental results indicate that the SIFT-SS algorithm is efficient for target classification and can obtain a higher recognition rate than affine moment invariants (AMI) and multi-scale auto-convolution (MSA) in some complex situations, such as the situation with the existence of noises and occlusions. Moreover, the computational time of SIFT-SS is shorter than MSA and longer than AMI.

Accession Number: WOS:000310275300002

ISSN: 1004-4132

Record 48 of 210

Title: Plasmonic nanosensor based on Fano resonance in waveguide-coupled resonators

Author(s): Lu, H (Lu, Hua); Liu, XM (Liu, Xueming); Mao, D (Mao, Dong); Wang, GX (Wang, Guoxi)

Source: OPTICS LETTERS  Volume: 37  Issue: 18  Pages: 3780-3782  DOI: 10.1364/OL.37.003780  Published: SEP 15 2012  

Abstract: We propose a plasmonic nanosensor based on Fano resonance in the strong-confinement metal-dielectric-metal waveguide side-coupled with a pair of nanoresonators. Due to the coherent interference of the splitting discrete and quasi-continuum modes, the reflection spectrum possesses a sharp asymmetric Fano resonance dip, which is dependent on the cavity-cavity phase and the refractive index change of the dielectric. The physical features contribute to a highly efficient plasmonic sensor for refractive index sensing. The nanosensor yields a sensitivity of similar to 900 nm/RIU and a figure of merit of similar to 500, remarkable values compared with those of plasmonic sensors supported by perfect absorbers. (C) 2012 Optical Society of America

Accession Number: WOS:000309046300014

PubMed ID: 23041857

Author Identifiers:

ISSN: 0146-9592

Record 49 of 210

Title: Picosecond laser-induced formation of spikes in a single crystal superalloy

Author(s): Zhang, W (Zhang, Wei); Cheng, GH (Cheng, Guanghua); Feng, Q (Feng, Qiang); Cao, LM (Cao, Lamei)

Source: APPLIED SURFACE SCIENCE  Volume: 258  Issue: 23  Pages: 9452-9456  DOI: 10.1016/j.apsusc.2012.02.056  Published: SEP 15 2012  

Abstract: The characteristics of laser-induced periodic surface structures (LIPSS) were investigated after laser irradiation with different pulse duration under a certain range of laser fluence (0.25 <= Phi <= 1.91 J/cm(2)) and pulse number (11 <= N <= 560). Spikes were generated by picosecond laser irradiation in ambient air, in comparison with only periodic ripple structures introduced by nanosecond and femtosecond laser irradiation. Microstructural investigations indicate that these spikes were initiated by the fragment of periodic ripple ridges or corrugation on the smooth surface with subsequent pulses, and their separation increased with increasing the laser fluence. Surface capillary waves associated with the resolidification process can be employed to explain the formation of spikes by picosecond laser irradiation. (c) 2012 Elsevier B.V. All rights reserved.

Accession Number: WOS:000307241800072

Conference Title: Symposium H on Indium Nitride and Related Alloys/ICAM IUMRS Spring Meeting of the European-Materials-Research-Society (E-MRS)

Conference Date: MAY 09-13, 2011

Conference Location: Nice, FRANCE

Conference Sponsors: European Mat Res Soc (E-MRS), ICAM, IUMRS

ISSN: 0169-4332

eISSN: 1873-5584

Record 50 of 210

Title: High-power and widely tunable Tm-doped fiber laser at 2 μm

Author(s): Guo, CZ (Guo, Chengzheng); Shen, DY (Shen, Deyuan); Long, JY (Long, Jingyu); Wang, F (Wang, Fei)

Source: CHINESE OPTICS LETTERS  Volume: 10  Issue: 9  Article Number: 091406  DOI: 10.3788/COL201210.091406  Published: SEP 10 2012  

Abstract: Efficient, high-power, and widely tunable Tm-doped fiber lasers cladding-pumped by diode lasers at 791 nm are demonstrated by use of an external cavity containing a diffraction grating. A maximum output power of 62 W is obtained at 2 004 nm for 140 W of launched pump power, corresponding to a slope efficiency of 48% with respect to launched pump power. The operating wavelength is tunable over 200 nm (1 895 to 2 109 nm), with >52 W of output power over a tuning range of 140 nm (1 926 to 2 070 nm). Prospects for further improvement in output power, lasing efficiency, and tuning range are considered.

Accession Number: WOS:000308782400015

Author Identifiers:

ISSN: 1671-7694

Record 51 of 210

Title: Slow-light element for tunable time delay based on optical microcoil resonator

Author(s): Ma, CJ (Ma, Chengju); Ren, LY (Ren, Liyong); Xu, YP (Xu, Yiping)

Source: APPLIED OPTICS  Volume: 51  Issue: 26  Pages: 6295-6300  DOI: 10.1364/AO.51.006295  Published: SEP 10 2012  

Abstract: We propose a simple and compact slow-light element by use of an optical microcoil resonator (OMR) constituted by two microfiber coils. Based on the matrix exponential method, we solve the coupled-wave equations of the OMR with n turns of microfiber coils and obtain a general solution. Simulations indicate that a tunable slow-light propagation can be obtained by controlling the coupling coefficient between the two adjacent microfiber coils by means of regulating the voltage applied to the ferroelectric crystal. A slow-light time delay up to 62 ps with a bandwidth of 0.4 nm is performed at the wavelength around 1.5 mu m. (C) 2012 Optical Society of America

Accession Number: WOS:000308858600004