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Photovoltaic properties of MEH-PPV/TiO_2 nanocomposites

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Chinese Science Bulletin 2008年第18期53卷 2743-2747页

作者： li yan HOU yanBing jin Hui SHI QuanMin WANG yan FENG ZhiHui Key Laboratory of Luminescence and Optical Information Ministry of Education of China Institute of Optoelectronic Technology Beijing Jiaotong University Beijing 100044 China

Photovoltaic properties of photodiodes based on nano-TiO_2 and poly[2-methoxy,5-(2′-ethlhexyloxy)- p-phenylenevinylene] (MEH-PPV) composites are investigated. By comparing composite devices with the same weight of TiO_2 (nanoparticles and nanotubes):MEH-PPV, it was found that the device with TiO_2 nanotubes exhibited better performance. By further optimizing the weight radio of TiO_2 nano- tubes:MEH-PPV, we gained the device with a short circuit current density of 9.27 μA/cm2 with a light intensity of 16.7 mW/cm2 at the 500 nm wavelength, the highest open-circuit voltage of 1.1 V, and a photosensitivity of 332 at reverse bias of -0.6 V. The photosensitivity is improved by a factor of 33 compared with the undoped MEH-PPV device.

关键词：太阳能电池氧化硅纳米管 MEH-PPV 纳米复合材料

Simulation of Voltage SET Operation in Phase-Change Random Access Memories with Heater Addition and Ring-Type Contactor for Low-Power Consumption by Finite Element Modeling

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Chinese Physics Letters 2010年第6期27卷 250-253页

作者： GONG Yue-Feng SONG Zhi-Tang liNG Yun liU yan li Yi-jin State Key Laboratory of Functional Materials for Informatics Laboratory of Nanotechnology Shanghai Institute of Micro-system and Information Technology Chinese Academy of Sciences Shanghai 200050

A three-dimensional finite element model for phase change random access memory is established to simulate electric, thermal and phase state distribution during （SET） operation. The model is applied to simulate the SET behaviors of the heater addition structure （HS） and the ring-type contact in the bottom electrode （RIB） structure. The simulation results indicate that the small bottom electrode contactor （BEC） is beneficial for heat efficiency and reliability in the HS cell, and the bottom electrode contactor with size Fx=80 nm is a good choice for the RIB cell. Also shown is that the appropriate SET pulse time is lOOns for the low power consumption and fast operation.

关键词： Simulation Models Cells Chops Electrodes Sets Lymphocytes

Controlling the Spectral Characteristics of Bismuth Doped Silicate Glass Based on the Reducing Reaction of Al Powder

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Chinese Physics Letters 2013年第4期30卷 95-98页

作者： WANG yan-Shan JIANG Zuo-Wen PENG jing-Gang li Hai-Qing yanG Lu-Yun li jin-yan DAI Neng-li Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074

Silicate glasses co-doped with Al metal powder and Bi2O3 are *** effects of Al on spectral properties of samples are *** is found that the absorption intensity increases with increasing Al concentration in bismuth doped silicate *** near-infrared(NIR)emission of the samples can be controlled by Al powder concentration no matter whether or not excited by 808 nm or 976 nm ***,the influence of Al on formation of Bi-NIR active ions is *** dependence relationship between the emission property of~416 nm and Al concentration is a way to investigate the NIR emission origin of bismuth doped glass.

关键词： glasses bismuth Glass

Blue-Extended Supercontinuum Generation in Photonic Crystal Fibers with Picosecond Pulse Pumping

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Chinese Physics Letters 2012年第12期29卷 109-111页

作者： ZHU Xian ZHANG Xin-Ben CHEN Xiang PENG jing-Gang DAI Neng-li li jin-yan Wuhan National Laboratory of Optoelectronics Huazhong University of Science and TecnologyWuhan 430074

We report supercontinuum generation extending to the blue spectral region using pulses of 1.8 ps duration at 1040 nm in GeO_(2)-doped core photonic crystal fibers.A spectrum in fundamental mode spanning from 415 nm to beyond 1750 nm is generated in a uniform photonic crystal fiber(PCF).A zero dispersion wavelength decreasing PCF is fabricated to optimize the parameters for deeper blue components generated by cross-phase modulation and group-velocity *** the PCF is pumped at a low input power of 1.3 W in anomalous dispersion and relatively far from the zero dispersion wavelength,a flat continuum covering 406.1-671.8 nm is generated,which is of primary importance in a number of bio-photonic applications such as fluorescence imaging microscopy.

关键词： pumped Crystal fiber

PMD compensation using birefringence photonic crystal fiber in 40Gbit/s optical communication system

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Optoelectronics Letters 2008年第1期4卷 30-32页

作者： CHEN Ming yanG Si-gang li jin-yan CHEN Wei XIE Shi-zhong Department of Electronic Engineering of Tsinghua University Beijing 100084 China Fiber Home Telecommunication Technologies CO. LTD Wuhan Research Institute of Post and TelecommunicationsWuhan 430074 China

A birefringence photonic crystal fiber is used for PMD compensation in a single-channel 40Gbit/s-speed optical communi- cation system with CSRZ format. The experimental results of transmission show that the PMD compen... 详细信息

关键词：光通信系统双折射光子晶体光纤光纤通信偏振模式散射

Enhanced Visible light Generation from 1μm Femtosecond Pulses within High-△Photonic Crystal Fibers

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Chinese Physics Letters 2011年第5期28卷 155-157页

作者： ZHANG Xin-Ben ZHU Xian CHEN Xiang PENG jing-Gang DAI Neng-li li jin-yan Wuhan National Laboratory of Optoelectronics Huazhong University of Science and TecnologyWuhan 430074

We demonstrate the blue light generated in high-△photonic crystal fibers(PCFs).A femtosecond Yb-doped fiber laser,operating at 1039nm,is used to pump a GeO_(2)-doped PCF in the largely anomalous group velocity dispersion(GVD)*** emitted radiation covers 418.6-544.6 nm with 5 dB *** calculated result indicates that the cross phase module(XPM)effect induced by higher-mode soliton makes a contribution to the blue component generation.

关键词： pump Femto fiber

A New Ge/F−Co-doped SMF with Enhanced SBS Threshold Fabricated by PCVD

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Chinese Physics Letters 2011年第10期28卷 116-118页

作者： liU Tian TONG Wei-Jun ZHANG Fang-Hai ZHANG Xin-Ben DAI Neng-li li jin-yan Wuhan National Laboratory of Optoelectronics Huazhong University of Science and TechnologyWuhan 430074 State Key Laboratory Yangtze Optical Fiber and Cable Company Ltd.Wuhan 430074

A new single-mode fibre(SMF)with high stimulated Brillouin scattering(SBS)threshold which is co-doped with GeO_(2) and F_(2) in the core is *** increase the SBS threshold,the acousto−optic effective area is increased by designing a transverse acoustic waveguide and adjusting the doping level of GeO2 and F2 while the designed fiber retains a step optical refractive index *** optimal design is found by numerical simulation and the optimal fiber is fabricated by a plasma−activated chemical vapor deposition(PCVD)*** yields the threshold 6.79 dB,which is higher than the conventional single-mode fiber G.652 and 3dB higher than the Corning®SMF−28e+^(™)optical fiber with NexCor®technology.

关键词： fiber waveguide scattering

No Culture, Without Languages

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China & The World Cultural Exchange 2014年第9期80卷 47-48页

作者： Su yan li jin

Language is the carrier of human civilizations passed on between generations, the key to exchanges and mutual understanding and the bond of cultural exchanges and mutual learning. There are different cultures behind d... 详细信息

关键词：文化语言人类文明交流

Photodarkening-Induced Absorption and Fluorescence Changes in Yb Fibers

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Chinese Physics Letters 2013年第10期30卷 116-119页

作者： CHEN Gui XIE Lu WANG Yi-Bo ZHAO Nan li Hai-Qing JIANG Zuo-Wen PENG jing-Gang yanG Lü-Yun DAI Neng-li li jin-yan Wuhan National Laboratory for Optoeletronics Huazhong University of Science and TechnologyWuhan 430074

We study the photodarkening effect in a double clad ytterbium-doped silica fiber fabricated by modified chemical vapor deposition and solution doping.A common measurement technology for photodarkening is used to study the photodarkening-induced absorption *** present a fast and simple method to observe the PD effect by measurement of the fluorescence *** method proposed here can be used to observe the influence for a short time,and thus reduces the requirements of system stability and heat *** is obtained that under the condition of 45.5%Yb ion inversion level,photodarkening-induced excessive loss at an equilibrium state is above 4.5 dB/m and florescence intensity degradation is above 10%after 500 min pumping at 1041 nm for the home-made normal Yb/Al co-doped silica fiber.

关键词： spectra pumping fiber