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Broadband high-efficiency dielectric metalenses based on quasi-continuous nanostrips

Opto-electronic advances 2024年第5期7卷 43-51页

作者： Xiaohu Zhang Qinmiao Chen Dongliang Tang Kaifeng Liu Haimo Zhang Lintong Shi Mengyao He Yongcai Guo Shumin Xiao key laboratory of optoelectronic Technology and Systems of the Education Ministry of China Chongqing UniversityChongqing 400044China 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 TechnologyShenzhen 518055China key laboratory for Micro/Nano Optoelectronic Devices of Ministry of Education&Hunan provincial key laboratory of Low-Dimensional Structural Physics and Devices School of Physics and ElectronicsHunan UniversityChangsha 410082China

Benefiting from the abrupt phase changes within subwavelength thicknesses,metasurfaces have been widely applied for lightweight and compact optical *** broadband and high-efficiency characteristics are highly attractive for the practical implementation of ***,current metasurface devices mostly adopt discrete micro/nano structures,which rarely realize both merits *** this paper,dielectric metasurfaces composed of quasi-continuous nanostrips are proposed to overcome this *** quasi-continuous nanostrips metasurface,a normal focusing metalens and a superoscillatory lens overcoming the diffraction limit are designed and experimentally *** quasi-continuous metadevices can operate in a broadband wavelength ranging from 450 nm to 1000nm and keep a high power *** average efficiency of the fabricated metalens reaches 54.24%,showing a significant improvement compared to the previously reported metalenses with the same *** proposed methodology can be easily extended to design other metadevices with the advantages of broadband and high-efficiency in practical optical systems.

关键词： broadband high-efficiency metalens sub-diffraction quasi-continuous

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Resonantly enhanced second-and third-harmonic generation in dielectric nonlinear metasurfaces

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Opto-electronic advances 2024年第5期7卷 5-19页

作者： Ji Tong Wang Pavel Tonkaev Kirill Koshelev Fangxing Lai Sergey Kruk Qinghai Song Yuri Kivshar Nicolae C.Panoiu Department of electronic and Electrical Engineering University College LondonLondon WC1E 7JEUnited Kingdom Nonlinear Physics Center Research School of PhysicsAustralian National UniversityCanberra ACT 2601Australia 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 TechnologyShenzhen 518055China Wuzhen laboratory EGO Wuzhen Digital Economy Industrial ParkNo.925 Daole RoadTongxiangChina

Nonlinear dielectric metasurfaces provide a promising approach to control and manipulate frequency conversion optical processes at the nanoscale,thus facilitating both advances in fundamental research and the development of new practical applications in photonics,lasing,and ***,we employ symmetry-broken metasurfaces made of centrosymmetric amorphous silicon for resonantly enhanced second-and third-order nonlinear optical *** the rich physics of optical quasi-bound states in the continuum and guided mode resonances,we comprehensively study through rigorous numerical calculations the relative contribution of surface and bulk effects to second-harmonic generation(SHG)and the bulk contribution to third-harmonic generation(THG) from the ***,we experimentally achieve optical resonances with high quality factors,which greatly boosts light-matter interaction,resulting in about 550 times SHG enhancement and nearly 5000-fold increase of THG.A good agreement between theoretical predictions and experimental measurements is *** gain deeper insights into the physics of the investigated nonlinear optical processes,we further numerically study the relation between nonlinear emission and the structural asymmetry of the metasurface and reveal that the generated harmonic signals arising from linear sharp resonances are highly dependent on the asymmetry of the *** work suggests a fruitful strategy to enhance the harmonic generation and effectively control different orders of harmonics in all-dielectric metasurfaces,enabling the development of efficient active photonic nanodevices.

关键词： second-harmonic generation third-harmonic generation bound state in the continuum guided mode resonance all-dielectric metasurfaces nonlinear optics

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Highly efficient nonuniform finite difference method for three-dimensional electrically stimulated liquid crystal photonic devices

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photonics Research 2024年第4期12卷 865-875页

作者： ZHENGHAO GUO MENGJUN LIU ZIJIA CHEN RUIZHI YANG PEIYUN LI HAIXIA DA DONG YUAN GUOFU ZHOU LINGLING SHUI HUAPENG YE Guangdong provincial key laboratory of Optical Information materials and Technology&Institute of electronic Paper Displays South China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou 510006China SCNU-TUE Joint lab of Device Integrated Responsive materials(DIRM) National Center for International Research on Green OptoelectronicsSouth China Normal UniversityGuangzhou 510006China Guangdong provincial key laboratory of Nanophotonic Functional materials and Devices School of Information and Optoelectronic Science and EngineeringSouth China Normal UniversityGuangzhou 510006China Joint laboratory of Optofluidic Technology and Systems National Center for International Research on Green OptoelectronicsSouth China Academy of Advanced OptoelectronicsSouth China Normal UniversityGuangzhou 510006China College of electronic and Optical Engineering&College of Microelectronics Nanjing University of Posts and TelecommunicationsNanjing 210046China key laboratory of Radio Frequency and Micro-Nano electronics of jiangsu Province Nanjing 210023China

Liquid crystal(LC)photonic devices have attracted intensive attention in recent decades,due to the merits of tunability,cost-effectiveness,and high ***,the precise and efficient simulation of large-scale three-dimensional electrically stimulated LC photonic devices remains challenging and resource *** we report a straightforward nonuniform finite difference method(NFDM)for efficiently simulating largescale LC photonic devices by employing a spatially nonuniform mesh grid.

关键词： nonuniform crystal finite

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Miniature tunable Airy beam optical meta-device

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Opto-electronic advances 2024年第2期7卷 5-12页

作者： Jing Cheng Zhang Mu Ku Chen Yubin Fan Qinmiao Chen Shufan Chen Jin Yao Xiaoyuan Liu Shumin Xiao Din Ping Tsai Department of Electrical Engineering City University of Hong KongKowloonHong Kong SAR 999077China State key laboratory of Terahertz and Millimeter Waves City University of Hong KongKowloonHong Kong SAR 999077China Centre for Biosystems Neuroscienceand NanotechnologyCity University of Hong KongKowloonHong Kong SAR 999077China 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 TechnologyShenzhen 518055China

Tunable Airy beams with controllable propagation trajectories have sparked interest in various fields,such as optical manipulation and laser *** research approaches encounter challenges related to insufficient compactness and integration feasibility,or they require enhanced tunability to enable real-time dynamic manipulation of the propagation *** this work,we present a novel method that utilizes a dual metasurface system to surpass these limitations,significantly enhancing the practical potential of the Airy *** approach involves encoding a cubic phase profile and two off-axis Fresnel lens phase profiles across the two *** validity of the proposed strategy has been confirmed through simulation and experimental *** proposed meta-device addresses the existing limitations and lays the foundation for broadening the applicability of Airy beams across diverse domains,encompassing light-sheet microscopy,laser fabrication,optical tweezers,etc.

关键词： metasurface miniature device tunable Airy beam tunable meta-device

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Physical simulations and experimental results of 4H-SiC MESFETs on high purity semi-insulating substrates

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Chinese Physics B 2009年第10期18卷 4474-4478页

作者：陈刚柏松李哲洋吴鹏陈征韩平 jiangsu provincial key lab of advanced photonic and electronic materials Department of Physics Nanjing University National key laboratory of Monolithic Integrated Circuits and Modules Nanjing Electronic Devices Institute

In this paper we report on DC and RF simulations and experimental results of 4H-SiC metal semiconductor field effect transistors （MESFETs） on high purity semi-insulating substrates. DC and small-signal measurements are compared with simulations. We design our device process to fabricate n-channel 4H-SiC MESFETs with 100 #m gate periphery. At 30 V drain voltage, the maximum current density is 440 mA/mm and the maximum transconductance is 33 mS/mm. For the continuous wave （CW） at a frequency of 2 GHz, the maximum output power density is measured to be 6.6 W/mm, with a gain of 12 dB and power-added efficiency of 33.7%. The cut-off frequency （fT） and the maximum frequency （fmax） are 9 GHz and 24.9 GHz respectively. The simulation results of fT and fmax are 11.4 GHz and 38.6 GHz respectively.

关键词： 4H-SiC MESFET simulation microwave

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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：李哲洋韩平李赟倪伟江鲍慧强李宇柱 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

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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 SiH 4 concentration, and this phenomenon has not been reported by others.

关键词：外延生长碳化硅集群浓度依赖性掺杂浓度表面形貌数据发现 SiC

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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

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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

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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

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