| Record 1 of 17 |
| Author(s): Huang, X (Huang, X.); Zhang, XH (Zhang, X. H.); Zhu, YG (Zhu, Y. G.); Li, T (Li, T.); Han, LF (Han, L. F.); Shang, XJ (Shang, X. J.); Ni, HQ (Ni, H. Q.); Niu, ZC (Niu, Z. C.) |
| Title: The refractive nonlinearities of InAs/GaAs quantum dots above-bandgap energy |
| Source: OPTICS COMMUNICATIONS, 283 (7): 1510-1513 APR 1 2010 |
| Abstract: The third-order optical nonlinear refractive properties of InAs/GaAs quantum dots grown by molecular beam epitaxy have been measured using the reflection Z-scan technique at above-bandgap energy. The nonlinear refractive index and nonlinear absorption index of the InAs/GaAs quantum dots were determined for wavelengths from 740 to 777 nm. The measured results are compared with the nonlinear refractive response of several typical III-V group semiconductor materials. The corresponding mechanisms responsible for the large nonlinear response are discussed. (C) 2009 Elsevier B.V. All rights reserved. |
| ISSN: 0030-4018 |
| DOI: 10.1016/j.optcom.2009.12.002 |
| Record 2 of 17 |
| Author(s): Wu, YF (Wu, Yue-Feng); Li, F (Li, Fang); Xu, TW (Xu, Tuan-Wei); Liu, YL (Liu, Yu-Liang) |
| Book Group Author(s): IEEE |
| Title: External Optical Feedback Induced Noise in DFB Fiber Laser Sensor System |
| Source: APOS: 2008 1ST ASIA-PACIFIC OPTICAL FIBER SENSORS CONFERENCE: 39-41 2008 |
| Conference Title: 1st Asia-Pacific Optical Fiber Sensors Conference |
| Conference Date: NOV 07-09, 2008 |
| Conference Location: Chengdu, PEOPLES R CHINA |
| Abstract: External optical feedback effects due to reflection, Rayleigh backscattering and coherent Rayleigh backscattering in DFB fiber laser sensor system has been investigated. If the feedback intensity exceeds critical amount, excess noise would be induced in the demodulator. The maximum tolerable intensity back-reflection coefficient R-c and backscattering coefficient Sc into a fiber distributed feedback (DFB) laser with lead fiber length from 1m similar to 37.5km before the onset of instabilities were shown. Rc was found to decrease with increasing lead fiber length while Sc was relatively invariable with varying fiber length. The coherent Rayleigh backscattering (CRBS) would induce neglectable noise with a lead fiber exceeding 13.5km. To eliminate these noises, one or two isolators should be incorporated in the system. |
| ISBN: 978-1-4244-2131-2 |
| Record 3 of 17 |
| Author(s): He, J (He, Jun); Li, F (Li, Fang); Xiao, H (Xiao, Hao); Liu, YL (Liu, Yuliang) |
| Book Group Author(s): IEEE |
| Title: Fiber Bragg Grating Sensor Array System Based on Digital Phase Generated Carrier Demodulation and Reference Compensation Method |
| Source: APOS: 2008 1ST ASIA-PACIFIC OPTICAL FIBER SENSORS CONFERENCE: 46-49 2008 |
| Conference Title: 1st Asia-Pacific Optical Fiber Sensors Conference |
| Conference Date: NOV 07-09, 2008 |
| Conference Location: Chengdu, PEOPLES R CHINA |
| Abstract: A novel fiber Bragg grating (FBG) sensor array system based on digital phase generated carrier (PGC) demodulation and reference compensation method is proposed and set up. Experimental results confirm that the digital PGC demodulation can be used for wavelength-division-multiplexed FBG sensor array and the reference compensation method can reduce the environmental interference by approximately 40 dB in the frequency range from 20 Hz to 2 kHz. The minimum detectable wavelength-shift of the sensor System is 1 x 10(-3) pm/root Hz. |
| ISBN: 978-1-4244-2131-2 |
| Record 4 of 17 |
| Author(s): Feng, L (Feng, Lei); He, J (He, Jun); Duan, JY (Duan, Jing-Yuan); Li, F (Li, Fang); Liu, YL (Liu, Yu-Liang) |
| Book Group Author(s): IEEE |
| Title: Implementation of Phase Generated Carrier Technique for FBG Laser Sensor Multiplexed System based on Compact RIO |
| Source: APOS: 2008 1ST ASIA-PACIFIC OPTICAL FIBER SENSORS CONFERENCE: 54-57 2008 |
| Conference Title: 1st Asia-Pacific Optical Fiber Sensors Conference |
| Conference Date: NOV 07-09, 2008 |
| Conference Location: Chengdu, PEOPLES R CHINA |
| Abstract: This paper presents the fundamental technique of PGC (phase generated carrier) and its realization on Compact RIO (Compact Reconfigurable Input and Output) which adopts real-time and FPGA (Field Programmable Grate Array) techniques. Improvement of the PGC technique is also introduced by using peak-to-peak value detection method to reduce the influence of variation of the light intensity. A four-element FBG (Fibre Bragg Gratings) Laser Sensor system is conducted in the experiment and the demodulated results demonstrate correlation coefficient as high as 0.995 with the reference signal and the dynamic range to be 120dB@63Hz. |
| ISBN: 978-1-4244-2131-2 |
| Record 5 of 17 |
| Author(s): Xiao, H (Xiao, Hao); Li, F (Li, Fang); He, J (He, Jun); Liu, YL (Liu, Yuliang) |
| Book Group Author(s): IEEE |
| Title: A DFB Fiber Laser Sensor System with Ultra-high Resolution and its Noise Analysis |
| Source: APOS: 2008 1ST ASIA-PACIFIC OPTICAL FIBER SENSORS CONFERENCE: 78-81 2008 |
| Conference Title: 1st Asia-Pacific Optical Fiber Sensors Conference |
| Conference Date: NOV 07-09, 2008 |
| Conference Location: Chengdu, PEOPLES R CHINA |
| Abstract: We describe a distributed feedback fiber laser (DFB FL) sensor system with ultra-high resolution. The sensor is made by writing distributed feedback structures into a high gain active fiber, and the system employs an unbalanced Michelson interferometer to translate laser wavelength shifts induced by weak measurands into phase shifts. A digital phase generated carrier demodulation scheme is introduced to achieve ultra-high resolution interrogation. A detailed noise analysis of the system is presented, and it is shown that the system resolution is limited by the frequency noise of the DFB FL. |
| ISBN: 978-1-4244-2131-2 |
| Record 6 of 17 |
| Author(s): Zhang, WT (Zhang, Wentao); Li, F (Li, Fang); Liu, YL (Liu, Yuliang); Xiao, H (Xiao, Hao) |
| Book Group Author(s): IEEE |
| Title: FBG Hydrophone: Theory and Experiment |
| Source: APOS: 2008 1ST ASIA-PACIFIC OPTICAL FIBER SENSORS CONFERENCE: 115-118 2008 |
| Conference Title: 1st Asia-Pacific Optical Fiber Sensors Conference |
| Conference Date: NOV 07-09, 2008 |
| Conference Location: Chengdu, PEOPLES R CHINA |
| Abstract: A fiber Bragg grating (FBG) hydrophone with enhanced sensitivity is demonstrated. A novel piston-like diaphragm with a hard core fixed at the center is used as the sensing element. Theoretical analysis shows that the Young's modulus of the diaphragm and the radius of the hard core have significant effect on the pressure sensitivity. Experiments are carried out to test this effect and the performance of the hydrophone. The static measurement result is in good agreement with the theoretical result and an acoustic sensitivity of 7nm/MPa has been achieved. |
| ISBN: 978-1-4244-2131-2 |
| Record 7 of 17 |
| Author(s): Lu, GJ (Lu Guo-Jun); Zhu, JJ (Zhu Jian-Jun); Jiang, DS (Jiang De-Sheng); Wang, YT (Wang Yu-Tian); Zhao, DG (Zhao De-Gang); Liu, ZS (Liu Zong-Shun); Zhang, SM (Zhang Shu-Ming); Yang, H (Yang Hui) |
| Title: Structural and optical properties of Al1-xInxN epilayers on GaN template grown by metalorganic chemical vapor deposition |
| Source: CHINESE PHYSICS B, 19 (2): Art. No. 026804 FEB 2010 |
| Abstract: This paper reports that Al1-xInxN epilayers were grown on GaN template by metalorganic chemical vapor deposition with an In content of 7%-20%. X-ray diffraction results indicate that all these Al1-xInxN epilayers have a relatively low density of threading dislocations. Rutherford backscattering/channeling measurements provide the exact compositional information and show that a gradual variation in composition of the Al1-xInxN epilayer happens along the growth direction. The experimental results of optical reflection clearly show the bandgap energies of Al1-xInxN epilayers. A bowing parameter of 6.5 eV is obtained from the compositional dependence of the energy gap. The cathodoluminescence peak energy of the Al1-xInxN epilayer is much lower than its bandgap, indicating a relatively large Stokes shift in the Al1-xInxN sample. |
| ISSN: 1674-1056 |
| Article Number: 026804 |
| Record 8 of 17 |
| Author(s): Yang, XH (Yang, Xiaohong); Xu, XL (Xu, Xiulai); Wang, XP (Wang, Xiuping); Ni, HQ (Ni, Haiqiao); Han, Q (Han, Qin); Niu, ZC (Niu, Zhichuan); Williams, DA (Williams, David A.) |
| Title: Optically controlled quantum dot gated transistors with high on/off ratio |
| Source: APPLIED PHYSICS LETTERS, 96 (8): Art. No. 083503 FEB 22 2010 |
| Abstract: We report the design and fabrication of InAs quantum dot gated transistors, which are normally-on, where the channel current can be switched off by laser illumination. Laser light at 650 nm with a power of 850 pW switches the channel current from 5 mu A to 2 pA, resulting in an on/off ratio of more than 60 dB. The switch-off mechanism and carrier dynamics are analyzed with simulated band structure. |
| ISSN: 0003-6951 |
| Article Number: 083503 |
| DOI: 10.1063/1.3323101 |
| Record 9 of 17 |
| Author(s): Zheng, WH (Zheng, Wanhua); Xing, MX (Xing, Mingxin); Chen, W (Chen, Wei); Zhou, WJ (Zhou, Wenjun); Liu, AJ (Liu, Anjin); Wang, HL (Wang, Hailing); Chen, LH (Chen, Lianghui) |
| Book Group Author(s): IEEE |
| Title: High efficient and tunable edge emitting microlaser on photonic crystal slab |
| Source: 2009 CONFERENCE ON LASERS AND ELECTRO-OPTICS AND QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE (CLEO/QELS 2009), VOLS 1-5: 632-633 2009 |
| Conference Title: Conference on Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference (CLEO/QELS 2009) |
| Conference Date: JUN 02-04, 2009 |
| Conference Location: Baltimore, MD |
| Abstract: Tunable edge emitting microlaser was realized with a line defect waveguide, in which the radii of holes adjacent to the defect was varied gradually. A tunable range of 17 nm was obtained experimentally. (C)2009 Optical Society of America |
| ISBN: 978-1-4244-5184-5 |
| Record 10 of 17 |
| Author(s): Liu, AJ (Liu, Anjin); Qu, HW (Qu, Hongwei); Chen, W (Chen, Wei); Xing, MX (Xing, Mingxin); Zhou, WJ (Zhou, Wenjun); Zheng, WH (Zheng, Wanhua) |
| Book Group Author(s): IEEE |
| Title: Coherent coupling in ring defect photonic crystal vertical cavity surface emitting laser |
| Source: 2009 CONFERENCE ON LASERS AND ELECTRO-OPTICS AND QUANTUM ELECTRONICS AND LASER SCIENCE CONFERENCE (CLEO/QELS 2009), VOLS 1-5: 2795-2796 2009 |
| Conference Title: Conference on Lasers and Electro-Optics/Quantum Electronics and Laser Science Conference (CLEO/QELS 2009) |
| Conference Date: JUN 02-04, 2009 |
| Conference Location: Baltimore, MD |
| Abstract: Selectively oxidized ring defect photonic crystal vertical cavity surface emitting laser (RD-PCVCSEL) is first demonstrated. The device achieves coherent coupling over the entire continuous-wave current range. (C) 2009 Optical Society of America |
| ISBN: 978-1-4244-5184-5 |
| Record 11 of 17 |
| Author(s): Zhang, B (Zhang, B.); Chen, CC (Chen, C. C.); Yang, C (Yang, C.); Wang, JZ (Wang, J. Z.); Shi, LQ (Shi, L. Q.); Cheng, HS (Cheng, H. S.); Zhao, DG (Zhao, D. G.) |
| Title: Ferromagnetic modification of GaN film by Cu+ ions implantation |
| Source: NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, 268 (2): 123-126 JAN 15 2010 |
| Abstract: The structural and magnetic properties of Cu+ ions-implanted GaN films have been reported. Eighty kilo-electron-volt Cu+ ions were implanted into n-type GaN film at room temperature with fluences ranging from 1 x 10(16) to 8 x 10(16) cm(-2) and subsequently annealed at 800 degrees C for 1 h in N-2 ambient. PIXE was employed to determine the Cu-implanted content. The magnetic property was measured by the Quantum Design MPMS SQUID magnetometer. No secondary phases or clusters were detected within the sensitivity of XRD. Raman spectrum measurement showed that the Cu ions incorporated into the crystal lattice positions of GaN through substitution of Ga atoms. Apparent ferromagnetic hysteresis loops measured at 10 K were presented. The experimental result showed that the ferromagnetic signal strongly increased with Cu-implanted fluence from 1 x 10(16) to 8 x 10(16) cm(-2). (C) 2009 Elsevier B.V. All rights reserved. |
| ISSN: 0168-583X |
| DOI: 10.1016/j.nimb.2009.10.168 |
| Record 12 of 17 |
| Author(s): Zhu, HL (Zhu, Hongliang); Xu, XD (Xu, Xiaodong); Wang, H (Wang, Huan); Kong, DH (Kong, Duanhua); Liang, S (Liang, Song); Zhao, LJ (Zhao, Lingjuan); Wang, W (Wang, Wei) |
| Title: The Fabrication of Eight-Channel DFB Laser Array Using Sampled Gratings |
| Source: IEEE PHOTONICS TECHNOLOGY LETTERS, 22 (5): 353-355 MAR 1 2010 |
| Abstract: An eight-channel monolithically integrated complex-coupled distributed-feedback laser array based on sampled gratings has been designed and fabricated. Selective lasing at different wavelengths is obtained. The frequency separation between each adjacent channel is about 200 GHz. The typical threshold current is between 30 and 40 mA. The optical output power of each channel is about 10 mW at an injection current of 100 mA. The continuous tuning of emission wavelength with injected currents is also demonstrated. |
| ISSN: 1041-1135 |
| DOI: 10.1109/LPT.2010.2041498 |
| Record 13 of 17 |
| Author(s): Che, KJ (Che, Kai-Jun); Yang, YD (Yang, Yue-De); Huang, YZ (Huang, Yong-Zhen) |
| Title: Mode Characteristics for Square Resonators With a Metal Confinement Layer |
| Source: IEEE JOURNAL OF QUANTUM ELECTRONICS, 46 (3): 414-420 MAR 2010 |
| Abstract: Microsquare resonators laterally confined by SiO2/Au/air multilayer structure are investigated by light ray method with reflection phase-shift of the multiple layers and two-dimensional (2-D) finite-difference time-domain (FDTD) technique. The reflectivity and phase shift of the mode light ray on the sides of the square resonator with the semiconductor/SiO2/Au/air multilayer structure are calculated for TE and TM modes by transfer matrix method. Based on the reflection phase shift and the reflectivity, the mode wavelength and factor are calculated by the resonant condition and the mirror loss, which are in agreement well with that obtained by the FDTD simulation. We find that the mode factor increases greatly with the increase of the SiO2 layer thickness, especially as d < 0.3 mu m. For the square resonator with side length 2 mu m and refractive index 3.2, anticrossing mode couplings are found for confined TE modes at wavelength about 1.6 mu m at d = 0.11 mu m, and confined TM modes at d = 0.71 mu m, respectively. |
| ISSN: 0018-9197 |
| DOI: 10.1109/JQE.2009.2031616 |
| Record 14 of 17 |
| Author(s): Chen, Y (Chen Yang); Wang, SJ (Wang Shoujue) |
| Title: Comparing the Performance of Biomimetic Pattern Recognition with W8 and SVM on Prediction of Horizontal Gene Transfers in Bacteria Genomes |
| Source: CHINESE JOURNAL OF ELECTRONICS, 19 (1): 86-90 JAN 2010 |
| Abstract: With the accomplishment of sequencing genomes, lots of homologous genes had been found in different species. These homologous genes are called horizontal transfer genes, in which genetic material is transferred from the genome of one organism to another. Prediction of the Horizontal gene transfers (HGT) has important meaning for understanding the genome evolution and estimating the hereditary material between species. A novel approach based on Biomimetic pattern recognition (BPR) was proposed to predict the horizontal gene transfers in bacterial genomes. The basis of BPR points to the Principle of homology-continuity (PHC) that the difference between two samples of the same class must be gradually changed. The aim of BPR is to find an optimal covering in the feature space, which rather than "division" in traditional pattern recognition, emphasizing the "similarity" among homologous group members. Two neuron models called Hyper sausage neuron (HSN) and psi(3)-neuron as covering units in BPR were used to construct the multi-weighted neural network. The performance of the approach was superior to that of gene scoring method of 8-nucleotide composition (W8) and one-class Support vector machine (SVM). |
| ISSN: 1022-4653 |
| Record 15 of 17 |
| Author(s): Ding, Y (Ding, Y.); Fan, WJ (Fan, W. J.); Xu, DW (Xu, D. W.); Tong, CZ (Tong, C. Z.); Liu, Y (Liu, Y.); Zhao, LJ (Zhao, L. J.) |
| Title: Low threshold current density, low resistance oxide-confined VCSEL fabricated by a dielectric-free approach |
| Source: APPLIED PHYSICS B-LASERS AND OPTICS, 98 (4): 773-778 Sp. Iss. SI MAR 2010 |
| Conference Title: Spring Meeting of the Quantum Optics and Photonics Section of the German-Physical-Society |
| Conference Date: 2009 |
| Conference Location: Hamburg, GERMANY |
| Conference Host: Univ Hamburg |
| Abstract: We present the fabrication process and experimental results of 850-nm oxide-confined vertical cavity surface emitting lasers (VCSELs) fabricated by using dielectric-free approach. The threshold current of 0.4 mA, which corresponds to the threshold current density of 0.5 kA/cm(2), differential resistance of 76 Omega, and maximum output power of more than 5 mW are achieved for the dielectric-free VCSEL with a square oxide aperture size of 9 mu m at room temperature (RT). L-I-V characteristics of the dielectric-free VCSEL are compared with those of conventional VCSEL with the similar aperture size, which indicates the way to realize low-cost, low-power consumption VCSELs with extremely simple process. Preliminary study of the temperature-dependent L-I characteristics and modulation response of the dielectric-free VCSEL are also presented. |
| ISSN: 0946-2171 |
| DOI: 10.1007/s00340-009-3810-7 |
| Record 16 of 17 |
| Author(s): Liu, AJ (Liu An-Jin); Xing, MX (Xing Ming-Xin); Qu, HW (Qu Hong-Wei); Chen, W (Chen Wei); Zhou, WJ (Zhou Wen-Jun); Zheng, WH (Zheng Wan-Hua) |
| Title: Control of the photonic crystal waveguide over the beam profile of vertical-cavity surface-emitting lasers |
| Source: ACTA PHYSICA SINICA, 59 (2): 1035-1039 FEB 2010 |
| Abstract: The control of the photonic crystal waveguide over the beam profile of vertical-cavity surface-emitting lasers is investigated. The symmetric slab waveguide model is adopted to analyze the control parameters, of the beam profile in the photonic-crystal vertical-cavity surface-emitting laser (PC-VCSEL). The filling factor (the ratio of the hole diameter to the lattice constant) and the etching depth control the divergence angle of the PC-VCSEL, and the low filling factor and the shallow etching depth are beneficial to achieve the low-divergence-angle beam. Two types of PC-VCSELs with different filling factors and etching depths are designed and fabricated. The experimental results show that the device with a lower filling factor and a shallower etching depth has a lower divergence angle, which agrees well with the theoretical predictions. |
| ISSN: 1000-3290 |
| Record 17 of 17 |
| Author(s): Peng, YC (Peng Ying-Cai); Fan, ZD (Fan Zhi-Dong); Bai, ZH (Bai Zhen-Hua); Ma, L (Ma Lei) |
| Title: Controlled growth of silicon nanowires by solid-liquid-solid method and their formation mechanism |
| Source: ACTA PHYSICA SINICA, 59 (2): 1169-1174 FEB 2010 |
| Abstract: High quality silicon nanowires (SiNWs) were grown directly from n-(111) silicon single crystal substrate by using Au film as a metallic catalyst. The diameter and length of the formed nanowires are 30-60 nm and from several micrometers to sereral tens of micrometers, respectively. The effects of Au film thickness, annealing temperature, growth time and N-2 gas flow rate on the formation of the nanowires were experimentally investigated. The results confirmed that the silicon nanowires with controlled diameter, length, shape and orientation can be obtained via reasonably choosing and optimizing various technical conditions. The formation process of the silicon nanowires is analyzed qualitatively based on solid-liquid-solid growth mechanism. |
| ISSN: 1000-3290 |
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