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Highly efficient tunable photodetector with a bipolar response in van der Waals heterojunctions

Science China(Technological Sciences) 2024年第2期67卷 639-646页

作者： SHI ChaoFan ZHANG Shi XIAO KeNing ZHANG liBo HAN li ZHU Yulin TANG WeiWei liU ChangLong li guanhai CHEN XiaoShuang College of Physics and Optoelectronic Engineering Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of Sciences Hangzhou310024China State Key Laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200083China

The heterojunction integration of two-dimensional(2D)materials via van der Waals(vdW)forces,unencumbered by lattice and processing constraints,constitutes an efficacious approach to enhance the overall optoelectronic performance of photodetectors,due to an assortment of distinctive light-matter ***,vdW heterojunction photodetectors based on transition metal dichalcogenides(TMDs)face an inevitable trade-off between low dark currents and high responsivity,curtailing the application potential of myriad novel optoelectronic components in sensing,spectral,and communication *** this study,we present the successful actualization of a highly sensitive,self-powered,and gate-tunable bipolar response *** mechanisms underlying photocurrent generation were scrutinized via bias-,power-,and position-dependent mapping photoresponse measurements,identifying the photovoltaic effect,which is attributable to the Schottky junction’s built-in electric field,as the predominant *** prototype Au-WS2-graphene photodetector exhibits a remarkable light on/off ratio of 1.2×10^(6),a specific detectivity of 6.12×10^(11)cm H^(z1/2)W^(-1)with 20μs response time at 638 *** wide gate-tunable responsivity provides an adjustability scope,ranging from 0.9 to 3.1 A W^(-1).Notably,the device demonstrates an exceptional linear photocurrent response,with a linear dynamic range(LDR)value approximating 130 dB,which significantly surpasses that of other photodetectors based on TMDs.

关键词： WS2/graphene van der Waals heterojunction gate-tunable bipolar response

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Photonic slide rule with metasurfaces

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light(Science & Applications) 2022年第4期11卷 674-685页

作者： Feilong Yu Jin Chen Lujun Huang Zengyue Zhao Jiuxu Wang Rong Jin Jian Chen Jian Wang Andrey E.Miroshnichenko Tianxin li guanhai li Xiaoshuang Chen Wei Lu State Key Laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of Sciences500 Yu Tian Road200083 ShanghaiChina. Hangzhou Institute for Advanced Study University of Chinese Academy of SciencesNo.1 Subl ane Xiangshan310024 HangzhouChina SShanghai Research Center for Quantum Sciences 99 Xiupu Road201315 ShanghaiChina University of Chinese Academy of Science No.19 Yuquan Road100049 BejingChina. School of Engineering and Information Technology University of New South WalesCanberra 2602Australia

As an elementary particle,a photon that carries information in frequency,polarization,phase,and amplitude,plays a crucial role in modern science and ***,how to retrieve the full information of unknown photons *** ultracompact manner over broad bandwidth remains a challenging task with growing ***,we demonstrate a versatile photonic slide rule based on an ll-silicon metasurface that enables uS to reconstruct incident photons'frequency and polarization *** underlying mechanism relies on the coherent interactions of frequency-driven phase diagrams which rotate at various angular velocities within broad *** rotation direction and speed are determined by the topological charge and phase ***,our metasurface leverages both achromatically focusing and azimuthally evolving phases with topological charges+1 and-1 to ensure the confocal annular intensity *** combination of geometric phase and interference holography allows the joint manipulations of two distinct group delay coverages to realize angle-resolved in-pair spots in *** manner-a behavior that would disperse along longitudinal direction in conventional *** spin-orbital coupling between the incident photons and vortex phases provides routing for the simultaneous identifcation of the photons'frequency and circular polarization state through recognizing the spots'*** work provides an analog of the conventional slide rule to flexibly characterize the photons in an ultracompact and multifunctional way and may find applications in integrated optical circuits or pocketable devices.

关键词： rule topological elementary

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Real-time Risk-averse Dispatch of an Integrated Electricity and Natural Gas System via Condi-tional Value-at-risk-based Lookup-table Ap-proximate Dynamic Programming

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Protection and Control of Modern Power Systems 2024年第2期9卷 47-60页

作者： Jianquan Zhu guanhai li Ye Guo Jiajun Chen Haixin liu Yuhao Luo Wenhao liu School of Electric Power Engineering South China University of Tech-nologyGuangzhou 510640China South China University of Technology GuangzhouChina

The real-time risk-averse dispatch problem of an integrated electricity and natural gas system(IEGS)is studied in this *** is formulated as a real-time conditional value-at-risk(CVaR)-based risk-averse dis-patch model in the Markov decision process *** of its stochasticity,nonconvexity and nonlinearity,the model is difficult to analyze by traditional algorithms in an acceptable *** address this non-deterministic polynomial-hard problem,a CVaR-based lookup-table approximate dynamic programming(CVaR-ADP)algo-rithm is proposed,and the risk-averse dispatch problem is decoupled into a series of tractable *** line pack is used as the state variable to describe the impact of one period’s decision on the *** facilitates the reduction of load shedding and wind power *** the proposed method,real-time decisions can be made according to the current information,while the value functions can be used to overview the whole opti-mization horizon to balance the current cost and future risk *** simulations indicate that the pro-posed method can effectively measure and control the risk costs in extreme ***,the decisions can be made within 10 s,which meets the requirement of the real-time dispatch of an *** Terms—Integrated electricity and natural gas system,approximate dynamic programming,real-time dispatch,risk-averse,conditional value-at-risk.

关键词： Integrated electricity and natural gas system approximate dynamic programming real-time dispatch risk-averse conditional value-at-risk

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Polychromatic full-polarization control in mid-infrared light

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light(Science & Applications) 2023年第5期12卷 894-904页

作者： Jin Chen Feilong Yu Xingsi liu Yanjun Bao Rongsheng Chen Zengyue Zhao Jiuxu Wang Xiuxia Wang Wen liu Yuzhi Shi Cheng-Wei Qiu Xiaoshuang Chen Wei Lu guanhai li State Key Laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of Sciences500 Yu Tian RoadShanghai 200083China Hangzhou Institute for Advanced Study University of Chinese Academy of SciencesNo.1 SubLane XiangshanHangzhou 310024China Shanghai Research Center for Quantum Sciences 99 Xiupu RoadShanghai 201315China University of Chinese Academy of Science No.19 Yuquan RoadBeijing 100049China Department of Electrical and Computer Engineering National University of Singapore4 Engineering Drive 3Singapore 117583Singapore Institute of Nanophotonics Jinan UniversityGuangzhou 511443China Center for Micro-and Nanoscale Research and Fabrication University of Science and Technology of ChinaHefei 230026China Institute of Precision Optical Engineering School of Physics Science and EngineeringTongji UniversityShanghai 200092China National University of Singapore Suzhou Research Institute No.377 Linquan StreetSuzhouJiangsu 215123China

Objects with different shapes,materials and temperatures can emit distinct polarizations and spectral information in mid-infrared band,which provides a unique signature in the transparent window for object ***,the crosstalk among various polarization and wavelength channels prevents from accurate mid-infrared detections at high signal-to-noise ***,we report full-polarization metasurfaces to break the inherent eigen-polarization constraint over the wavelengths in *** recipe enables to select arbitrary orthogonal polarization basis at individual wavelength independently,therefore alleviating the crosstalk and efficiency degradation.A six-channel all-silicon metasurface is specifically presented to project focused mid-infrared light to distinct positions at three wavelengths,each with a pair of arbitrarily chosen orthogonal *** isolation ratio of 117 between neighboring polarization channels is experimentally recorded,exhibiting detection sensitivity one order of magnitude higher than existing infrared ***,the high aspect ratio~30 of our meta-structures manufactured by deep silicon etching technology at temperature−150℃ guarantees the large and precise phase dispersion control over a broadband from 3 to 4.5μ*** believe our results would benefit the noise-immune mid-infrared detections in remote sensing and space-to-ground communications.

关键词： polarization light noise

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Ultrawide dynamic modulation of perfect absorption with a Friedrich–Wintgen BIC

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Photonics Research 2023年第3期11卷 456-462页

作者： ENDUO GAO RONG JIN ZHENCHU FU GUANGTAO CAO YAN DENG JIAN CHEN guanhai li XIAOSHUANG CHEN HONGJIAN li School of Physics and Electronics Central South UniversityChangsha 410083China State Key Laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200083China School of Physics and Electronic Sciences Changsha University of Science and TechnologyChangsha 410004China School of Physics and Chemistry Hunan First Normal UniversityChangsha 410205China Hangzhou Institute for Advanced Study University of Chinese Academy of SciencesHangzhou 310024China

Dynamical control of perfect absorption plays an indispensable role in optical switch and ***,it always suffers from the limited modulation range,small depth,and susceptible absorption ***,we propose a new strategy based on Friedrich–Wintgen bound states in the continuum(F–W BICs)to realize a tunable perfect absorber with large dynamic modulation *** proof of concept,we demonstrate a pentaband ultrahigh absorption system consisting of graphene gratings and graphene sheets through elaborately tuning F–W *** nature of the F–W BIC arises from the destructive interference between Fabry–Perot resonance and guided mode resonance modes in the coherent phase-matching *** radiation channels are avoided from *** BIC can be dynamically modulated by engineering the Fermi level of graphene gratings,which breaks the traditional modulation methods with an incidence ***,the perfect absorber with this F–W BIC approach achieves the largest modulation range of up to 3.5 *** believe that this work provides a new way to dynamically engineer perfect absorption and stimulates the development of multiband ultracompact devices.

关键词： tuning absorption perfect

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All-dielectric metasurface for fully resolving arbitrary beams on a higher-order Poincaré sphere

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Photonics Research 2021年第3期9卷 331-343页

作者： Hui Yang Zhenwei Xie guanhai li Kai Ou Feilong Yu Hairong He Hong Wang Xiaocong Yuan Nanophotonics Research Center Shenzhen Key Laboratory of Microscale Optical Information TechnologyInstitute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China School of Electrical and Electronic Engineering Nanyang Technological UniversitySingapore 639798Singapore National Laboratory for Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200083China

Characterizing the amplitude, phase profile, and polarization of optical beams is critical in modern optics. With a series of cascaded optical components, one can accurately resolve the optical singularity and polarization state in traditional polarimetry systems. However, complicated optical setups and bulky configurations inevitably hinder future applications for integration. Here, we demonstrate a metadevice that fully resolves arbitrary beams on a higher-order Poincaré sphere(HOPS) via a single-layer all-silicon metasurface. The device is compact and capable of detecting optical singularities and higher-order Stokes parameters simultaneously through a single intensity measurement. To verify the validity of the proposed metadevice, different beams on HOPS0,0 and HOPS1,-1 are illuminated on the metadevices. The beams are fully resolved, and the reconstructed higher-order Stokes parameters show good agreement with the original ones. Taking the signal-to-noise ratio into account, the numerical simulations indicate that the design strategy can be extended to fully resolve arbitrary beams on HOPS with order up to 4. Because of the advantages of compact configuration and compatibility with current semiconductor technology, the metadevice will facilitate potential applications in information processing and optical communications.

关键词： Poincaré arbitrary singularity

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High-frequency enhanced response based on Sb_(2)Te_(3)topological insulators

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Photonics Research 2022年第10期10卷 2302-2308页

作者： SHI ZHANG CHAOFAN SHI WEIWEI TANG liBO ZHANG li HAN CHENGSEN YANG ZHENGYANG ZHANG JIAN WANG MIAO CAI guanhai li CHANGLONG liU liN WANG XIAOSHUANG CHEN WEI LU College of Physics and Optoelectronic Engineering Hangzhou Institute for Advanced StudyUniversity of Chinese Academy of SciencesHangzhou 310024China State Key Laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200083China Shanghai Institute of Optics and Fine Mechanics Chinese Academy of SciencesShanghai 201800China Department of Optoelectronic Science and Engineering Donghua UniversityShanghai 201620China Terahertz Technology Innovation Research Institute Shanghai Key Laboratory of Modern Optical SystemUniversity of Shanghai for Science and TechnologyShanghai 200093China

Topological insulators represent a new quantum phase of matter with spin-polarized surface states that are protected from backscattering, exhibiting electronic responses to light, such as topological quantum phase transitions. However, the effects of high-frequency driving topological intrinsic systems have remained largely unexplored challenges experimentally for high-sensitivity terahertz detection. In this study, by integrating Sb2Te3 topological insulators with subwavelength metal antennas through micro-nano processing, a high-frequency terahertz detector with high sensitivity is proposed. The enhanced response originates from the asymmetric scattering of the surface electrons in the Sb_(2)Te_(3) flakes induced by the terahertz wave. The device displays room-temperature photodetection with a responsivity of 192 mA/W and equivalent noise power of less than 0.35 nW/Hz^(1/2) in the frequency range from 0.02 to 0.3 THz. These results pave the way for the exploitation of topological insulators for high-frequency operation in real-time imaging within long-wavelength optoelectronics.

关键词： scattering insulator quantum

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宽带消色差红外光学超构透镜研究进展(特邀)

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红外与激光工程 2021年第1期50卷 16-24页

作者：欧凯郁菲茏陈金李冠海陈效双中国科学院上海技术物理研究所红外物理国家重点实验室上海200083

超构透镜是由亚波长散射单元结构排列而成的具有聚焦功能的平面二维超构表面。超构表面能够在亚波长尺度上操控光场的振幅、相位、色散和偏振态,是近年来迅速发展起来的新型光场调控载体。亚波长共振纳米结构使得高阶衍射被抑制,入射光... 详细信息

超构透镜是由亚波长散射单元结构排列而成的具有聚焦功能的平面二维超构表面。超构表面能够在亚波长尺度上操控光场的振幅、相位、色散和偏振态,是近年来迅速发展起来的新型光场调控载体。亚波长共振纳米结构使得高阶衍射被抑制,入射光场可以完美地被调制到设计的衍射级次上,从而确保了超构表面器件具有高的光子调控效率。同时,超构单元在设计上的灵活性及其特定的电磁响应使得超构表面可以实现对光场多个维度的定制化操控。不同于传统光学透镜依赖光传播的相位累积效应,宽带消色差超构透镜通过对光场相位和相位色散的同时独立调控解决了传统通过级联多个透镜修正色差造成的光学系统复杂和体积庞大限制,为发展小型化片上集成光学提供了全新的思路。文中围绕超构透镜的相关研究,首先介绍了超构表面调控光场振幅、相位和偏振态的基本原理,在此基础上,重点回顾了近年来关于超透镜的研究发展,包括通过单一参量调控的单波长超透镜的实现,以及通过对光场偏振、相位及相位色散的多参量联合调控的多功能宽带消色差超构透镜的发展现状,最后讨论其进一步发展的可能挑战与应用前景。

关键词：超构透镜相位色散消色差成像偏振调控

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喹唑啉-4-酮衍生物的合成及抗肿瘤活性

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有机化学 2017年第2期37卷 455-461页

作者：孙佳婧周利凯谭官海李帅王淑霞陈华李小六河北大学化学与环境科学学院河北省化学生物学重点实验室保定071002

以邻氨基苯甲酸、芳醛和甘氨酸乙酯为原料,利用亚胺和亚胺烯酮的加成反应,芳构化合成了系列含氨基酸链的C-2和N-3双取代的喹唑啉-4-酮衍生物5.酸性条件下脱除羧甲基,设计合成了连有氨基侧链的喹唑啉酮衍生物9,并评价了化合物的抗肿瘤细... 详细信息

以邻氨基苯甲酸、芳醛和甘氨酸乙酯为原料,利用亚胺和亚胺烯酮的加成反应,芳构化合成了系列含氨基酸链的C-2和N-3双取代的喹唑啉-4-酮衍生物5.酸性条件下脱除羧甲基,设计合成了连有氨基侧链的喹唑啉酮衍生物9,并评价了化合物的抗肿瘤细胞增殖活性.化合物9ba和9bc具有较好的抗Hela细胞增殖活性,IC_(50)值分别为8.16和7.47μmol/L,而9bc和9bd具有较好的抗A549细胞增殖活性,IC_(50)值分别为5.62和9.54μmol/L.构效关系表明,C-2位香豆素(较大的π平面芳环)取代以及氨基侧链的引入有利于化合物的抗肿瘤活性.

关键词：喹唑啉-4-酮抗肿瘤活性亚胺烯酮氨基侧链羧甲基脱除香豆素

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考虑灵活性不足风险的园区综合能源系统优化调度

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高电压技术 2024年第2期50卷 704-713,I0019-I0025页

作者：黎观海朱建全赵文猛朱文凯刘海欣曾恺华南理工大学电力学院广州510640 南方电网科学研究院有限责任公司广州510663

园区综合能源系统可以实现能源的高效利用,提高可再生能源的消纳能力。但是,随着可再生能源的渗透率升高,系统的运行灵活性需求激增,给其安全、经济运行带来了巨大挑战。在这种背景下,该文提出一种考虑运行灵活性不足风险的电-热园区综... 详细信息

园区综合能源系统可以实现能源的高效利用,提高可再生能源的消纳能力。但是,随着可再生能源的渗透率升高,系统的运行灵活性需求激增,给其安全、经济运行带来了巨大挑战。在这种背景下,该文提出一种考虑运行灵活性不足风险的电-热园区综合能源系统优化调度方法。首先,综合考虑电力子系统与非电(热力)子系统的运行灵活性需求,给出园区综合能源系统的运行灵活性需求和供给的数学表达,并以运行灵活性裕量和运行灵活性不足风险成本作为系统运行灵活性的评价指标。然后,基于条件风险价值,推导出系统运行灵活性不足风险约束的数学表达。由于考虑灵活性不足风险的电-热园区综合能源系统优化调度问题具有随机性、非凸性、非线性和0/1离散整数变量,在数学上属于NP-hard问题,因此,在马尔可夫决策过程框架下对其进行建模,并采用近似动态规划算法对所提模型进行求解。最后,通过算例验证了所提方法的有效性。

关键词：园区综合能源系统优化调度灵活性条件风险价值近似动态规划

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