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Influence of Beam Equilibrium Self-fields on Linear Gain for a Free Electron Laser

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Chinese Physics Letters 1991年第8期8卷 392-395页

作者： yu junsheng LIU Shenggang Southwestern Institute of Physics Chengdu 610041 University of Electronic Science and Technology of China Chengdu 610054

The small-signal linear gain for a combined electromagnetic wiggler and an axial-guide magnetic field free electron laser is derived within the presence of beam equilibrium *** numerical results show that the gain is ... 详细信息

关键词： gain fields wiggler

Microstructure control of organic semiconductors via UV-ozone for high-sensitivity NO2 detection

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Science China(Technological Sciences) 2021年第5期64卷 1057-1064页

作者： HOU SiHui FAN HuiDong WU MengGe yu XinGe yu junsheng State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu 610054China Department of Biomedical Engineering City University of Hong KongHong KongChina

Developing high sensitive organic semiconductors(OSCs)in organic thin-film transistors(OTFTs)is the key for OTFT based gas ***,we report a simple processing route of highly sensitive OSCs for high performance OTFT based nitrogen dioxide(NO2)sensors,where the active OSC layer is based on ultraviolet-ozone(UVO)treated poly(3-hexylthiophene-2,5-diyl)(P3HT).Compared to conventional P3HT based OTFT sensors,the reported device exhibits a remarkable improvement of the gas response from 350%to 30000%.The studies in morphologies,chemical compositions and microstructures of the UVOtreated films reveal that a large number of carrier traps generated in the P3HT films is the decisive reason for the enhancement of sensing ***,the optimized device shows great potential of practical applications on the stand points of sensitivity,selectivity,reusability and the ability of recovery,as well as limit of detection of~7.3 *** simple method provides an innovative understanding for the role of the carrier traps in sensing performance and demonstrates a bright future for developing high performance OTFT gas sensors.

关键词： ultraviolet-ozone organic thin-film transistors gas sensors carrier traps nitrogen dioxide

Analysis of axially displaced elliptical antenna using hybrid method

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The Journal of China Universities of Posts and Telecommunications 2015年第6期22卷 51-56,93页

作者： Liu Xiaoming yu junsheng Chen Xiaodong School of Electronic Engineering Beijing University of Posts and Telecommunications School of Electronic Engineering and Computer Science Queen Mary University of London

Axially displaced elliptical （ADE） antenna is an evolved version of Gregorian antenna, bearing advantages of minimized blockage and relatively uniform field distribution. However, the analysis of the electrical performance of this type of antenna is a difficulty to be addressed properly. To enable the simulation of such type of reflector antenna, a hybrid method is derived for predicting the farfield of ADE antennas. Closed formulae are firstly derived for the calculation of the near field of ADE antennas based on vector analysis and the law of energy conservation. These formulae avoid time-consuming surface current integration and the current singularity on the vertex of the sub-reflector. In addition, the nature of vector analysis makes the hybrid method be capable of predicting vector electric field precisely. Furthermore, since these formulae are in explicit manner, no ray tracing process is required. The farfield is then predicted using Huygens equivalent method, assuring the accuracy in the farfield. Compared to published experimental results in the literature, the proposed method agrees well with the measurement in the main beam region. In comparison to physical optic method, the computational efficiency is much improved.

关键词： ADE antenna hybrid method Huygens equivalent method

Preparation,Characterization and Comparative NH_3-sensing Characteristic Studies of PANI/inorganic Oxides Nanocomposite Thin Films

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Journal of Materials Science & Technology 2010年第7期26卷 605-613页

作者： Hulling Tai Yadong Jiang Cuangzhong Xie junsheng yu State Key Laboratory of-Electronic Thin Films and-Integrated Devices School of Optoelectronic Information University of Electronic Science and Technology of China (UESTC) Chengdu 610054 China

Polyaniline （PANI）, polyaniline/titanium dioxide （PANI/TiO2）, polyaniline/tin oxide （PANI/SnO2） and polyaniline/indium oxide （PANI/In203） thin films were developed by using an in-situ self-assembly method at -10℃. Chemical structure, optical property and morphology of all the thin films were characterized by X-ray diffraction （XRD）, Fourier transform infrared （FTIR） spectroscopy, UV-Vis absorption spectroscopy, scanning electron microscopy （SEM） and transmission electron microscopy （TEM）. NH3 gas-sensing properties of PANI and PANI nanocomposite thin films were examined at ambient temperature. The results showed that all the sensors composed of PANI nanocomposite thin films had faster response/recovery rate with better reproducibility, selectivity and long-term stability to NH3 than PANI,thiS film sensor, and PANI/TiO2 nanocomposite thin film sensor showed optimum NH3 gas-sensing characteristics. The effect of humidity on the responses of all the sensors was also investigated.

关键词： PANI/TiO2 PANI/SnO2 , PANI/In2O3 Thin films NH3

Control of vertical phase separation in high performance non-fullerene organic solar cell by introducing oscillating stratification preprocessing

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Nano Research 2021年第5期14卷 1319-1325页

作者： Dayong Zhang Pu Fan Jinyu Shi Yifan Zheng Jian Zhong junsheng yu State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of ChinaChengdu610054China Shanghai Institute of Optics and Fine Mechanics Chinese Academy of SciencesShanghai201800China

Non-fullerene organic solar cell(NFOSC)has attracted tremendous attention due to their great potential for commercial *** improve its power conversion efficiency(PCE),generally,sequential solution deposition(SSD)methods have been employed to construct the graded vertical phase separation(VPS)of the bulk-heterojunction(BHJ)active layer for efficient exciton separation and charge ***,a variety of orthogonal solvents used in the SSD may lead to the unpredicted change in the BHJ morphology and introduce additional defects inside the BHJ bulk thus complicate the fabrication ***,a simple oscillating stratification preprocessing(OSP)is developed to facilitate the formation of graded VPS among the BHJ *** a result,a significant improvement is obtained in PCE from 10.96%to 12.03%,which is the highest value reported among PBDB-T:ITIC based NFOSC.

关键词： oscillating stratification preprocessing graded vertical phase separation non-fullerene organic solar cells high performance sequential solution deposition

Fabrication and Properties of DC Magnetron Sputtered Indium Tin Oxide on Flexible Plastic Substrate

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Journal of Materials Science & Technology 2009年第1期25卷 119-122页

作者： Hui Lin junsheng yu Nana Wang Shuangling Lou Yadong Jiang State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Information University of Electronic Science and Technology of China （UESTC） Chengdu 610054 China

Indium tin oxide （ITO） thin films deposited on flexible polyethylene terephthalate （PET） substrates at low temperature by DC magnetron sputtering from an In-Sn （90-10 wt pct） alloy target were studied. The correla- tion between deposition conditions and ITO property was systematically investigated and characterized. These as-deposited ITO films were used as the anode contact for flexible organic light-emitting diodes （FOLEDs）. The fabricated FOLEDs with a structure of PET/ITO/NPB （50 nm）/Alq （20 nm）/Mg：Ag （100 nm） showed a maximum luminance of 2125 cd/m^2 at 13 V.

关键词： Flexible Organic light-emitting diodes Indium tin oxide DC sputtering

A Wideband E-Plane Crossover Coupler for Terahertz Applications

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China Communications 2021年第5期18卷 245-254页

作者： Xiaohe Cheng Zhiyan Liu yuan Yao junsheng yu Xiaodong Chen Beijing Key Laboratory of Work Safety Intelligent Monitoring School of Electronic EngineeringBeijing University of Posts and TelecommunicationsBeijing 100876China School of Electronic Engineering and Computer Science Queen Mary University of LondonLondon E14NSU.K.

In this paper,a new approach to design terahertz(THz)E-plane crossover coupler is *** cascading two symmetrical septum polarizers,a simple structure with wide operating bandwidth and high isolation performance is *** working principle is explained by operating waveguide *** simplify the optimization process,the scattering matrix(S-matrix)of the crossover is *** prototypes loaded and unloaded electromagnetic band gap(EBG)are fabricated and *** electrical contact problem at assembly plane is eliminated by the prototype loaded EBG.A measured bandwidth of 17.3%from 92.5 to 110 GHz for reflection and isolation coefficients-2 dB is achieved.

关键词： butler matrix crossover coupler high isolation multi-beam THz

Low Temperature DC Sputtering Deposition on Indium-Tin Oxide Film and Its Application to Inverted Top-emitting Organic Light-emitting Diodes

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Journal of Materials Science & Technology 2008年第2期24卷 179-182页

作者： Hui LIN junsheng yu Shuangling LOU Jun WANG Yadong JIANG State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Information University of Electronic Science and Technology of China （UESTC） Chengdu 610054 China

Indium tin oxide （ITO） ultrathin films were prepared on glass substrate by DC （direct current） magnetron sputtering technique with the assistance of H2O vapor to avoid potential surface damage. The film properties were characterized by X-ray diffraction （XRD） technique, four-point probe method and spectrophotometer. The results show that the deposited ITO film with introduced H2O during sputtering process was almost amorphous. The average visible light transmission of 100 nm ITO film was around 85% and square resistivity was below 80 Ω/square. The film was used as the transparent anode to fabricate an inverted top-emitting organic light-emitting diodes （IT-OLEDs） with the structure of glass substrate/Alq3 （40 nm）/NPB （15 nm）/CuPc （x nm）/ITO anode （100 nm）, where the film thickness of CuPc was optimized. It was found that the luminance of this IT-OLEDs was improved from 25 cd/m^2 to more than 527 cd/m^2 by increasing the thickness of CuPc, and luminance efficiency of 0.24 lm/W at 100 cd/m^2 was obtained, which indicated that the optimized thickness of CuPc layer was around 15 nm.

关键词： Inverted top-emitting organic light-emitting diodes Indium-tin-oxide Ultrathin film DC sputtering

High-Gain Dual Circularly Polarized Antenna for Air-to-Ground Wireless Link

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Chinese Journal of Electronics 2022年第3期31卷 555-561页

作者： JIANG Hang YAO yuan XIU Tao CHENG Xiaohe yu junsheng CHEN Xiaodong School of Electronic Engineering Beijing University of Posts and Telecommunications School of Electronic Engineering and Computer Science Queen Mary University of London

This paper presents an E-band reflector antenna fed by dual circularly polarized feed system. Axial displaced ellipse reflector is adopted for high gain and low blockage mechanisms. The feed system mainly composed of orthomode transducer, iris polarizer and horn antenna, and possesses dual circular polarization. The orthomode transducer offers high isolation performance in broadband by double symmetry and the iris polarizer achieves phase shift by introducing discontinuities. In addition, the ridge and iris in the feed are optimized to be wide enough to fabricate and maintain good mechanical properties in higher frequency band. The entire antenna is simulated and fabricated. The measured gain of 45 ± 1.2 d Bi corresponds to about 52% efficiency. The measured results of reflection coefficients less than-18 d B, isolation over 27 d B, axial-ratio value less than 2.3 d B are achieved from 71 to 86 GHz.

关键词： antenna radiation patterns low blockage mechanisms reflector antennas dual circular polarization high-gain dual circularly polarized antenna horn antennas radio links iris polarizer air-to-ground wireless link orthomode transducer electromagnetic wave polarisation E-band reflector antenna antenna feeds horn antenna high isolation performance dual circularly polarized feed system axial displaced ellipse reflector