2014

• Record 397 of
  
  Title:Investigations of switchable fiber soliton laser mode-locked by carbon nanotubes
  
  Author(s):Han, Dongdong(1); Zeng, Chao(1)
  Source: Optics Communications  Volume: 319  Issue:   DOI: 10.1016/j.optcom.2014.01.002  Published: May 15, 2014  
  Abstract:We have numerically and experimentally investigated a switchable erbium-doped fiber (EDF) laser mode-locked by single-walled carbon nanotubes for the first time to our best knowledge. Depending on the pump power, the central wavelength of the mode-locked pulse can be switched from about 1531 to 1557 nm. The formation and evolution of the switchable soliton operation are investigated numerically by solving the extended nonlinear Schrödinger equation with the appropriate gain profile. Numerical results demonstrate that the switchable mode-locking operation is attributed to the variation of the gain spectrum of EDF, agreeing well with the experimental observations. © 2014 Elsevier B.V.
  Accession Number: 20140617269398
• Record 398 of
  
  Title:A Study on the technical method of drilling micro holes on new CMC-SiC with femtosecond laser
  
  Author(s):Feng, Wang(1,2); Luo, Jian Jun(1); Li, Ming(2); Deng, Yue(2)
  Source: Applied Mechanics and Materials  Volume: 543-547  Issue:   DOI: 10.4028/www.scientific.net/AMM.543-547.3924  Published: 2014  
  Abstract:To solve the difficulties of processing micro holes on the CMC-SiC, femtosecond laser was used as the drilling tool in this paper. And a new type of laser beam scanning module was studied. The study confirms the feasibility of finishing the processing of micro holes whose diameter is less than 2mm on the new CMC-SiC. And the preliminary optimization of processing parameters is completed. According to the experimental results, the important factors affecting the quality of the micro holes were analyzed, and the factors are the processing power and the scanning speed. The results also show that the femtosecond laser processing technology can solve the difficulties of drilling mirco holes on the new CMC-SiC in our country's aerospace field. © (2014) Trans Tech Publications, Switzerland.
  Accession Number: 20141717625475
• Record 399 of
  
  Title:Giant and tunable electric field enhancement in the terahertz regime
  
  Author(s):Lu, Xiaoyuan(1); Wan, Rengang(1); Wang, Guoxi(1); Zhang, Tongyi(1); Zhang, Wenfu(1)
  Source: Optics Express  Volume: 22  Issue: 22  DOI: 10.1364/OE.22.027001  Published: 2014  
  Abstract:A novel array of slits design combining the nano-slit grating and dielectric-metal is proposed to obtain giant and tunable electric field enhancement in the terahertz regime. The maximum amplitude of electric field is more than 6000 times larger than that of the incident electric field. It is found that the enhancement depends primarily on the stripe and nano-slits width of grating, as well as the thickness of spacer layer. This property is particularly beneficial for the realization of ultra-sensitive nanoparticles detection and nonlinear optics in the terahertz range, such as the second harmonic generation (SHG). © 2014 Optical Society of America
  Accession Number: 20150100400618
• Record 400 of
  
  Title:Investigations of switchable fiber soliton laser mode-locked by carbon nanotubes
  
  Author(s):Han, Dongdong(1); Zeng, Chao(1)
  Source: Optics Communications  Volume: 319  Issue:   DOI: 10.1016/j.optcom.2014.01.002  Published: May 15, 2014  
  Abstract:We have numerically and experimentally investigated a switchable erbium-doped fiber (EDF) laser mode-locked by single-walled carbon nanotubes for the first time to our best knowledge. Depending on the pump power, the central wavelength of the mode-locked pulse can be switched from about 1531 to 1557 nm. The formation and evolution of the switchable soliton operation are investigated numerically by solving the extended nonlinear Schrödinger equation with the appropriate gain profile. Numerical results demonstrate that the switchable mode-locking operation is attributed to the variation of the gain spectrum of EDF, agreeing well with the experimental observations. © 2014 Elsevier B.V. All rights reserved.
  Accession Number: 20144800243509
• Record 401 of
  
  Title:Plasmonic spectral splitting in multi-resonator-coupled waveguide systems
  
  Author(s):Zeng, Chao(1)
  Source: Applied Optics  Volume: 53  Issue: 1  DOI: 10.1364/AO.53.000038  Published: January 1, 2014  
  Abstract:Spectral splitting is numerically investigated in a metal-insulator-metal plasmonic waveguide coupled with a series of disk cavities for the first time to our best knowledge. The finite-difference time-domain simulations find that, when an identical cavity is introduced into the single-cavity-coupled structure, a resonance peak emerges in reflection dip due to the plasmonic analogue of electromagnetically induced transparency. By cascading multiple cavities into the waveguide system, the resonance spectra are gradually split because of the phase-coupled effects. Particularly, the quality factors of splitting resonance spectra can be rapidly improved with increasing the number of coupled cavities. The proposed plasmonic systems may find potential applications in highly integrated optical circuits, especially for multichannel filtering, all-optical switching, and slow-light devices. © 2014 Optical Society of America.
  Accession Number: 20140217184125
• Record 402 of
  
  Title:Plasmonic sensor based on perfect absorber with metallic nanoring structures
  
  Author(s):Lu, Xiaoyuan(1); Zhang, Wenfu(1); L., Zhang; R., Wan; T., Zhang; G., Wangy
  Source: Proceedings of SPIE - The International Society for Optical Engineering  Volume: 9275  Issue:   DOI: 10.1117/12.2086963  Published: 2014  
  Abstract:We propose a nanoring array structure backed by a metal mirror to achieve perfect infrared absorber with absorption as high as 99:99%. The frequency of the absorption peak strongly depends on the refractive index surrounding the structured surface. This novel feature can be used as plasmonic sensor for refractive index measurement. This plasmonic sensor possesses sensitivity of 600 nm/RIU and the gure of merit can be 180. Due to the high sensitivity and simple sensing scheme, the sensing strategy can nd potential applications in nonlaboratory environments. © 2014 SPIE.
  Accession Number: 20150700531193
• Record 403 of
  
  Title:Low-cost multipoint liquid-level sensor with plastic optical fiber
  
  Author(s):Lin, Xiao(1); Ren, Liyong(1); Xu, Yiping(1); Chen, Nana(1); Ju, Haijuan(1); Liang, Jian(1); He, Zhengquan(1); Qu, Enshi(1); Hu, Baowen(1); Li, Yulin(1)
  Source: IEEE Photonics Technology Letters  Volume: 26  Issue: 16  DOI: 10.1109/LPT.2014.2329037  Published: August 15, 2014  
  Abstract:A simple and low-cost discrete liquid-level measurement system is present in this letter. It consists of a group of plastic optical fiber segments, which are aligned coaxially and spaced equally. When the spacing between every two adjacent fiber segments is filled with liquid, the light power will be easier to couple from one segment to the next as compared with the situation that the fibers are exposed in air. Based on this point, we design this intensity-based sensor and investigate its working properties theoretically by using the ray-tracing method. The performance of this sensor is demonstrated in detail where different liquids are utilized as specimens. © 2014 IEEE.
  Accession Number: 20143218040063
• Record 404 of
  
  Title:Bound state of dissipative solitons in a nanotube-mode-locked fiber laser
  
  Author(s):Yun, Ling(1); Han, Dongdong(1)
  Source: Optics Communications  Volume: 313  Issue:   DOI: 10.1016/j.optcom.2013.10.005  Published: 2014  
  Abstract:The bound state of dissipative solitons (DSs) in a nanotube-based erbium-doped fiber laser is observed experimentally for the first time to our best knowledge. The bound-state DSs exhibit a rectangular spectrum profile accompanied by high-contrast modulated fringes on the top. The pulse duration of DSs is estimated as ~3.6 ps and the pulse-pulse separation is ~30 ps. The propagation dynamics of the bound-state DSs are further investigated by utilizing single-mode fiber with different lengths. It is found that the pulses can be compressed to ~208 fs and subsequently broadened linearly along the extracavity fiber, while the pu separation between the two bound-state DSs remains constant. © 2013 Elsevier B.V.
  Accession Number: 20134516943990
• Record 405 of
  
  Title:Nanotube-mode-locked fiber laser delivering dispersion-managed or dissipative solitons
  
  Author(s):Han, Xiaoxiang(1)
  Source: Journal of Lightwave Technology  Volume: 32  Issue: 8  DOI: 10.1109/JLT.2014.2306961  Published: April 15, 2014  
  Abstract:We have proposed a bidirectional erbium-doped fiber laser delivering dispersion-managed soliton (DMS) or dissipative soliton (DS) based on a single-wall carbon nanotube mode-locker. In the proposed scheme, the net cavity dispersion approaches to zero in the counter-clockwise (CCW) direction while is normal in the clockwise (CW) direction. By properly adjusting the intracavity attenuators, DMS in the CCW direction and DS in the CW direction can be obtained, respectively. However, attributing to the cavity asymmetry between CCW and CW directions, simultaneous generation of DMS and DS is not achieved. Although the output DMS and DS almost have the same central wavelength, they exhibit distinct optical spectra, pulse durations, and repetition rates. The switchable all-fiber laser delivers two different types of ultra-short pulses, which significantly facilitates the practical applications. © 1983-2012 IEEE.
  Accession Number: 20141417542971
• Record 406 of
  
  Title:Dual-channel dispersionless slow light based on plasmon-induced transparency
  
  Author(s):Han, Xiaoxiang(1)
  Source: Applied Optics  Volume: 53  Issue: 1  DOI: 10.1364/AO.53.000009  Published: January 1, 2014  
  Abstract:I have proposed a dual-channel dispersionless slow-light waveguide system based on plasmon-induced transparency. By appropriately tuning the stub depth, two transparency windows in the transmission spectrumcan be achieved due to the destructive interference between the electromagnetic fields from the three stubs. Two flat bands can be achieved in the transparency windows, which have nearly constant group indices over the bandwidth of 2 THz. The analytical results show that the group velocity dispersion parameters of the two channels equal zero, which indicates that the incident pulse can be slowed down without distortion. The proposed plasmonic waveguide system can realize slow-light effect without pulse distortion, and thus can find important applications on slow-light systems, optical buffers, and all-optical signal processors in highly integrated optical circuits. © 2014 Optical Society of America.
  Accession Number: 20140217184126
• Record 407 of
  
  Title:High-contrast electro-optic modulation of spatial light induced by graphene-integrated Fabry-Pérot microcavity
  
  Author(s):Zeng, Chao(1); Guo, Jing(1); Liu, Xueming(1)
  Source: Applied Physics Letters  Volume: 105  Issue: 12  DOI: 10.1063/1.4895633  Published: September 22, 2014  
  Abstract:We have proposed a graphene-integrated Fabry-Pérot microcavity for efficient modulation of spatial light. A simplified theoretical model is established to analyze the performance of our system, and the calculated results agree well with the simulation results. It is shown that the plasmon-induced transparency (PIT) effect is achieved in the proposed microcavity and the central frequency of PIT window can be dynamically tuned by gate voltages. In particular, the PIT spectra exhibit extremely large modulation depths (∼ 90%) across a broad range of frequencies. The proposed ultracompact configuration demonstrates a type of cavity-induced high-contrast and frequency-selective electro-optic modulators, offering opportunities in exploiting active chip-integrated high-performance devices operating at frequencies from terahertz to mid-infrared. © 2014 AIP Publishing LLC.
  Accession Number: 20144100094319
• Record 408 of
  
  Title:Frequency non-degenerate phase-sensitive optical parametric amplification based on fourwave-mixing in width-modulated silicon waveguides
  
  Author(s):Wang, Zhaolu(1); Liu, Hongjun(1); Sun, Qibing(1); Huang, Nan(1); Li, Xuefeng(2)
  Source: Optics Express  Volume: 22  Issue: 25  DOI: 10.1364/OE.22.031486  Published: December 15, 2014  
  Abstract:A width-modulated silicon waveguide is proposed to realize nondegenerate phase sensitive optical parametric amplification. It is found that the relative phase at the input of the phase sensitive amplifier (PSA) θIn-PSA can be tuned by tailoring the width and length of the second segment of the width-modulated silicon waveguide, which will influence the gain in the parametric amplification process. The maximum gain of PSA is larger by 9 dB compared with the phase insensitive amplifier (PIA) gain, and the gain bandwidth of PSA is larger by 35 nm compared with the gain bandwidth of PIA. Our on-chip PSA can find important potential applications in highly integrated optical circuits for optical chip-to-chip communication and computers. © 2014 Optical Society of America.
  Accession Number: 20145200372585