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Epitaxial Growth of 4H-SiC on 4° Off-Axis Substrate for Power Devices

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Chinese Physics Letters 2011年第9期28卷 257-259页

作者： LI Zhe-Yang HAN Ping LI Yun NI Wei-Jiang BAO Hui-Qiang LI Yu-Zhu jiangsu provincial key lab of advance photonic and electronic materials Department of PhysicsNanjing UniversityNanjing 210093 National key laboratory of Monolithic Integrated Circuits and Modules Nanjing Electronic Devices InstituteNanjing 210016 TanKeBlue Semiconductor CO. Ltd.Beijing 100190

Homo-epitaxial layers are successfully grown on Si-face 4°off−axis 4H-SiC substrates using the horizontal hot-wall chemical vapor deposition *** smooth surface without morphological defects is obtained by the optimized in situ etching process and growth *** diodes fabricated on the epilayer present a typical I–V *** is the first report of Schottky diodes fabricated on 4°off-axis 4H-SiC substrates made in China.

关键词： temperature Schottky diodes

Influence of silicon cluster on epitaxial growth of silicon carbide

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Science China(Physics,Mechanics & Astronomy) 2011年第9期54卷 1579-1582页

作者： LI ZheYang LI Yun CHEN Chen HAN Pin jiangsu provincial key lab of advance photonic and electronic materials Department of Physics Nanjing University Nanjing 210093 China National key laboratory of Monolithic Integrated Circuits and Modules the 55th Research Institute of CETC Nanjing 210016 China

Precursor concentration dependences of growth rate, doping concentration and surface morphology have been investigated in the epitaxial growth of 4H-SiC（0001） epilayers with horizontal hot-wall CVD system using various precursor concentrations under constant C/Si ratio. Form the experimental data it is found that silicon cluster which is formed through gas phase nucleation plays an important role in controlling the doping concentration and epitaxial growth rate of the silicon carbide. It was observed that the concentration of silicon clusters cannot reach the equilibrium value in the process by using a low Sill4 concentration, and this phenomenon has not been reported by others.

关键词： 4H-SiC horizontal hot-wall CVD C/Si ratio growth rate doping concentration silicon cluster

Influence of single scattering and multiple scattering on backscattered Mueller matrix in turbid media

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Chinese Optics Letters 2009年第1期7卷 64-66页

作者：徐兰青李晖郑勇平 key laboratory of Opto-electronic Science and Technology for Medicine(Fujian Normal University) Ministry of EducationFujian Provincial Key Lab of Photonic Technology

Monte Carlo algorithm and Stokes-Mueller formalism are used to simulate the propagation behavior of polarized light in turbid media. The influence of single scattering and multiple scattering on backscattered Mueller matrix in turbid media is discussed. Single and double scattering photons form the major part of backscattered polarization patterns, while multiple scattering photons present more likely as background. Further quantitative analyses show that single scattering approximation and double scattering approximation are quite accurate when discussing the polarization patterns near the incident point.

关键词： Light Multiple scattering Photons Polarization Turbidity

Characterizing UVB-induced skin tumor process using optical coherence tomography

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Journal of Innovative Optical Health Sciences 2016年第5期9卷 30-37页

作者： Shulian Wu Zheng Huang Yunxia Wang Hui Li key lab of Optoelectronic Science and Technology for Medicine Fujian provincial key lab of photonic Technology College of photonic and electronic Engineering Fujian Normal University Fuzhou 350007 FujianP.R.China

The incidence of nonmelanoma skin cancer is rising *** major cardinogenic factor for most skin cancers is solar ultraviolet light,in particular,the chronic exposure to UVB(280-320nm).In this study,the optical characteristics of skin canceration process induced by UVB were *** coherence tomography(OCT)was used for monitoring the morphologic changes and compared with histological ***,the optical property,such as the attenuation cofficient(A4)was systematically extracted and *** addition,characteristic text ures,including energy,entropy and correlation were revealed from OCT *** suggest that OCT is a useful tool for monitoring the process of UVB-induced skin cancer and changes of optical property during this process.

关键词： Skin cancer UVB morphologic change attenuation coefficient texture

Scanning photoacoustic imaging of submucosal gastric tumor based on a long focused transducer in phantom and in vitro experiments

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Journal of Innovative Optical Health Sciences 2019年第3期12卷 55-66页

作者： Hua-Qin Wu Hao-Yu Wang Wen-Ming Xie Shu-Lian Wu Zhi-Fang Li Xiao-Man Zhang Hui Li key laboratory of Optoelectronic Science and Technology for Medicine Ministry of Education Fujian provincial key lab of photonic Technology College of photonic and electronic Engineering Fujian Normal University Fuzhou 350007FujianP.R.China

Photoacoustic imaging,which can provide the maximum intensity contrast in tissue depth imaging without ionizing radiation,will be a promising imaging trend for tumor *** this paper,a column diffusionfiber was employed to carry a pulsed laser for irradiating stomach directly through esophagus based on the characteristics of gastric tissue structure.A long focused ultrasonic transducer was placed outside the body to detect photoacoustic signals of gastric *** and in vitro experiments of submucosal gastric tumors were carried out to check the sensitivity of scanning photoacoustic tomography system,including the lateral and longitudinal resolution of the system,sensitivity of different absorption coefficient in imaging,capability of transversal detection,and probability of longitudinal *** results demonstrate that our innovative technique can improve the parameters of *** lateral resolution reaches 2.09 *** a depth of 5.5mm with a longitudinal accuracy of 0.36mm below gastric mucosa of early gastric cancer(EGC)has been *** addition,the optimal absorption coefficient differences among absorbers of system are 3.3-3.9 *** indicate that our photoacoustic imaging(PAI)system,is based on a long focusing transducer,can provide a potential application for detecting submucosal EGC without obvious symptoms.

关键词： Column diffusionfiber long focusing transducer gastric tumor detection scanning photoacoustic tomography phantom experiment

Reconstruction of 3D light distribution produced by cylindrical diffuser in deep tissues based on photoacoustic imaging

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Chinese Optics Letters 2014年第5期12卷 45-48页

作者：谢文明刘玉滨李志芳李晖 key lab of Optoelectronic Science and Technology for Medicine Fujian provincial key lab of photonic Technology College of photonic and electronic Engineering Fujian Normal University

Measurement of light distribution in biological tissue contributes to selecting strategy and optimizing dose for biomedical application. In this letter, a photoacoustic method combined with Monte Carlo simulation was used to estimate the three-dimensional light distribution in biological tissue. The light distribution was produced by a cylindrical diffuser which interposed into tissues. The light profiles obtained by the method were compared to those detected by photo diodes. The experimental results demonstrate the feasibility of this method. The approach can play a significant role for photo-dosimetry in biomedical phototherapy.

关键词： Reconstruction of 3D light distribution produced by cylindrical diffuser in deep tissues based on photoacoustic imaging deep

An All-Fiber Gas Raman Light Source Based on a Hydrogen-Filled Hollow-Core photonic Crystal Fiber Pumped with a Q-Switched Fiber Laser

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Chinese Physics Letters 2011年第7期28卷 118-121页

作者： CHEN Xiao-Dong MAO Qing-He SUN Qing ZHAO Jia-Sheng LI Pan FENG Su-Juan Anhui provincial key lab of photonics Devices and materials Anhui Institute of Optics and Fine MechanicsChinese Academy of SciencesHefei 230031 State key laboratory of Pulsed Power Laser Technology Optoelectronics DepartmentElectronic Engineering InstituteHefei 230037

A gas Raman light source based on a H2−filled hollow-core photonic-crystal-fiber cell with a Q-switched fiber laser followed by a fiber amplifier as the Raman pump source is *** Stokes frequency-shift lasing line is observed at 1135.7 nm with the Q-switched pump pulses at 1064.7 *** experimental results show that the generated Stokes pulse is much narrower than the pump pulse,and the generated Stokes pulse duration is increased with the single pulse energy for the same duration pump *** the 125 ns pump pulses with a repetition rate of 5 kHz,the Raman threshold pump energy and the conversion efficiency at the Raman threshold are 2.13µJ and 9.82%.Moreover,by choosing narrower pump pulses,the Raman threshold pump energy may be reduced and the conversion efficiency may be improved.

关键词： pump fiber switched

A platform for integrated spectrometers based on solution-processable semiconductors

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Light(Science & Applications) 2023年第9期12卷 1739-1748页

作者： Yanhao Li Xiong Jiang Yimu Chen Yuhan Wang Yunkai Wu De Yu Kaiyang Wang Sai Bai Shumin Xiao Qinghai Song Ministry of Industry and Information Technology key lab of Micro-Nano Optoelectronic Information System Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic SystemsHarbin Institute of Technology(Shenzhen)ShenzhenGuangdong 518055China Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengduSichuan 611731China Collaborative Innovation Center of Extreme Optics Shanxi UniversityTaiyuanShan`xi 030006China

Acquiring real-time spectral information in point-of-care diagnosis,internet-of-thing,and other lab-on-chip applications require spectrometers with hetero-integration capability and miniaturized *** to conventional semiconductors integrated by heteroepitaxy,solution-processable semiconductors provide a much-flexible integration platform due to their solution-processability,and,therefore,more suitable for the multi-material integrated ***,solution-processable semiconductors are usually incompatible with the micro-fabrication *** work proposes a facile and universal platform to fabricate integrated spectrometers with semiconductor substitutability by unprecedently involving the conjugated mode of the bound states in the continuum(conjugated-BIC)***,exploiting the conjugated-BIC photonics,which remains unexplored in conventional lasing studies,renders the broadband photodiodes with ultra-narrowband detection ability,detection wavelength tunability,and on-chip integration ability while ensuring the device *** based on these ultra-narrowband photodiode arrays exhibit high spectral resolution and wide/tunable spectral *** fabrication processes are compatible with solution-processable semiconductors photodiodes like perovskites and quantum dots,which can be potentially extended to conventional *** from the spectrometers directly constitute the incident spectra without being computation-intensive,latency-sensitive,and *** an example,the integrated spectrometers based on perovskite photodiodes are capable of realizing narrowband/broadband light reconstruction and in-situ hyperspectral imaging.

关键词： semiconductors process integration

Economical generation of high-quality optical vortices with gradual-width Fermat spiral slit mask

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Science China(Physics,Mechanics & Astronomy) 2023年第4期66卷 75-83页

作者： Qi Huang Xingyuan Lu Hao Zhang Zhuoyi Wang Yuanjie Yang Qiwen Zhan Yangjian Cai ChengLiang Zhao School of Physical Science and Technology Soochow UniversitySuzhou 215006China School of Physics University of Electronic Science and Technology of ChinaChengdu 610054China School of Optical-Electrical and Computer Engineering University of Shanghai for Science and TechnologyShanghai 200093China Shandong provincial Engineering and Technical Center of Light Manipulations&Shandong provincial key laboratory of Optics and photonic Device School of Physics and ElectronicsShandong Normal UniversityJinan 250358China

A general model for creating an optical vortex using a variable-width Fermat spiral slit(FSS)mask was *** generated optical vortex demonstrates much better quality than those produced by slits with a uniform *** depth of focus was nearly doubled,which can be explained by discretizing the gradual-width *** demonstrate the generation robustness,the slits were printed on a transparent slide,and an output vortex beam with greater than 98%intensity purity was *** the high quality and simplicity of this vortex generation method,its analysis and generation scheme are expected to be extended to generation of plasmonic vortices and short-wavelength light sources such as X-rays and electron *** of highquality optical vortex beams at an almost negligible cost will make investigation much more accessible.

关键词： optical vortex gradual-width Fermat spiral slit high quality economical generation