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Angle-selective perfect absorption with two-dimensional materials

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Light(Science & Applications) 2015年第1期4卷 59-64页

作者： Linxiao Zhu Fengyuan Liu Hongtao Lin Juejun Hu zongfu yu Xinran Wang Shanhui Fan Department of Applied Physics Stanford UniversityStanfordCA 94305USA National Laboratory of Solid State Microstructures School of Electronic Science and Engineering and Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China Department of Materials Science and Engineering Massachusetts Institute of TechnologyMA 02139USA Department of Electrical and Computer Engineering University of Wisconsin-MadisonMadisonWI 53706USA Department of Electrical Engineering Ginzton LaboratoryStanford UniversityStanfordCA 94305USA

Two-dimensional(2D)materials have great potential in photonic and optoelectronic ***,the relatively weak light absorption in 2D materials hinders their application in practical ***,we propose a general approach to achieve angleselective perfect light absorption in 2D *** a demonstration of the concept,we experimentally show giant light absorption by placing large-area single-layer graphene on a structure consisting of a chalcogenide layer atop a mirror and achieving a total absorption of 77.6%in the mid-infrared wavelength range(~13μm),where the graphene contributes a record-high 47.2%absorptivity of mid-infrared *** of such an angle-selective thin optical element is important for solar and thermal energy harvesting,photo-detection and sensing *** study points to a new opportunity to combine 2D materials with photonic structures to enable novel device applications.

关键词： angle-selective perfect absorption angle-selective thin optical element graphene mid-infrared two-dimensional materials

Metal-dielectric-metal plasmonic waveguide devices for manipulating light at the nanoscale

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Chinese Optics Letters 2009年第4期7卷 302-308页

作者： Georgios Veronis zongfu yu Sukru Ekin Kocaba David A. B. Miller Mark L. Brongersma Shanhui Fan Department of Electrical and Computer Engineering and Center for Computation and Technology Louisiana State University Baton Rouge LA 70803 USA Ginzton LaSoratory Stanford University Stanford CA 94305 USA GeSalle LaSoratory of Advanced Materials Stanford University Stanford CA 94305 USA

We review some of the recent advances in the development of subwavelength plasmonic devices for manipulating light at the nanoseale, drawing examples from our own work in metal-dielectric-metal （MDM） plasmonic waveguide devices. We introduce bends, splitters, and mode converters for MDM waveguides with no additional loss. We also demonstrate that optical gain provides a mechanism for on/off switching in MDM plasmonic waveguides. Highly efficient compact couplers between dielectric waveguides and MDM waveguides are also introduced.

关键词： Metals Multiplexing Nanotechnology Optical waveguides Plasmons Waveguide components Waveguides

Compact CMOS spectral sensor for the visible spectrum

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Photonics Research 2019年第9期7卷 961-966页

作者： YIBO ZHU XIN LEI KEN XINGZE WANG zongfu yu Coherent AI LLC Redwood CityCalifornia94065USA School of Physics Huazhong University of Science and TechnologyWuhan430079China Department of Electrical and Computer Engineering University of Wisconsin–MadisonMadisonWisconsin53705USA

A compact single-shot complementary metal-oxide semiconductor(CMOS) spectral sensor for the visible range(wavelength 400–700 nm) is presented. The sensor consists of two-dimensional silicon nitride-based photonic crystal(PC) slabs atop CMOS photodetectors. The PC slabs are fabricated using one-step lithography and amenable to monolithic integration into CMOS image sensors. Featuring a small footprint of 300 μm× 350 μm,the sensor can successfully measure the spectra over the 400–700 wavelength range with a best resolution of1 nm. The footprint of the sensor may be further reduced to enable hyperspectral imaging with high spatial resolution.

关键词： PC red Compact CMOS spectral sensor for the visible spectrum

Deep learning in photonics:introduction

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Photonics Research 2021年第8期9卷 I0001-I0003页

作者： LI GAO YANG CHAI DARKO ZIBAR and zongfu yu Institute of Advanced Materials(IAM) and School of Materials Science and EngineeringNanjing University of Posts and TelecommunicationsNanjing 210046China Department of Applied Physics The Hong Kong Polytechnic UniversityHong KongChina Department of Photonics Engineering Technical University of Denmark2800 Kgs.Lyngby Denmark department of Electrical and Computer Engineering University of WisconsinMadisonWisconsin 53706USA

The connection between Maxwell’s equations and neural networks opens unprecedented opportunities at the interface between photonics and deep *** feature issue highlights recent research progress at the interdisciplinary field of photonics and deep learning and provides an opportunity for different communities to exchange their ideas from different perspectives.

关键词： Deep photonics learning

Neuromorphic metasurface

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Photonics Research 2020年第1期8卷 46-50页

作者： ZHICHENG WU MING ZHOU ERFAN KHORAM BOyuAN LIU zongfu yu Department of Electrical and Computer Engineering University of WisconsinMadisonWisconsin 53706USA

Metasurfaces have been used to realize optical functions such as focusing and beam *** use subwavelength nanostructures to control the local amplitude and phase of *** we show that such control could also enable a new function of artificial neural *** demonstrate that metasurfaces can directly recognize objects by focusing light from an object to different spatial locations that correspond to the class of the object.

关键词： surfaces enable surface

Atomically thin optical lenses and gratings

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Light(Science & Applications) 2016年第1期5卷 562-569页

作者： Jiong Yang Zhu Wang Fan Wang Renjing Xu Jin Tao Shuang Zhang Qinghua Qin Barry Luther-Davies Chennupati Jagadish zongfu yu yuerui Lu Research School of Engineering College of Engineering and Computer Sciencethe Australian National UniversityCanberraACT 2601Australia Department of Electrical and Computer Engineering University of WisconsinMadisonWI 53706USA Department of Electronic Materials Engineering Research School of Physics and Engineeringthe Australian National UniversityCanberraACT 2601Australia CUDOS Laser Physics CentreResearch School of Physics and Engineeringthe Australian National UniversityCanberraACT 2601Australia

Two-dimensional(2D)materials have emerged as promising candidates for miniaturized optoelectronic devices due to their strong inelastic interactions with *** the other hand,a miniaturized optical system also requires strong elastic light–matter interactions to control the flow of *** we report that a single-layer molybdenum disulfide(MoS2)has a giant optical path length(OPL),around one order of magnitude larger than that from a single-layer of *** such giant OPL to engineer the phase front of optical beams we have demonstrated,to the best of our knowledge,the world’s thinnest optical lens consisting of a few layers of MoS2 less than 6.3 nm *** taking advantage of the giant elastic scattering efficiency in ultra-thin high-index 2D materials,we also demonstrated high-efficiency gratings based on a single-or few-layers of *** capability of manipulating the flow of light in 2D materials opens an exciting avenue towards unprecedented miniaturization of optical components and the integration of advanced optical *** importantly,the unique and large tunability of the refractive index by electric field in layered MoS2 will enable various applications in electrically tunable atomically thin optical components,such as micro-lenses with electrically tunable focal lengths,electrical tunable phase shifters with ultra-high accuracy,which cannot be realized by conventional bulk solids.

关键词： atomically thin grating micro-lens MoS2 two-dimensional

Nanophotonic media for artificial neural inference

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Photonics Research 2019年第8期7卷 823-827页

作者： ERFAN KHORAM ANG CHEN DIANJING LIU LEI YING QIQI WANG MING yuAN zongfu yu Department of Electrical and Computer Engineering University of Wisconsin MadisonMadisonWisconsin53706USA Department of Aeronautics and Astronautics Massachusetts Institute of TechnologyCambridgeMassachusetts02139USA Department of Statistics Columbia UniversityNew YorkNew York10027USA

We show optical waves passing through a nanophotonic medium can perform artificial neural *** information is encoded in the wavefront of an input light. The medium transforms the wavefront to realize sophisticated computing tasks such as image recognition. At the output, the optical energy is concentrated in well-defined locations, which, for example, can be interpreted as the identity of the object in the *** computing media can be as small as tens of wavelengths and offer ultra-high computing density. They exploit subwavelength scatterers to realize complex input/output mapping beyond the capabilities of traditional nanophotonic devices.

关键词： image simulation Nanophotonic media

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农村学前教育的困境与出路

教育发展研究 2009年第24期29卷 32-36页

作者：张朝于宗富山东理工大学教育科学研究所淄博255049

近年来,城乡间学前教育差距明显拉大,社会分层化日趋明显,并出现了农村学前教育边缘化的趋向,主要表现为农村幼儿园师幼比远低于城市;农村幼儿教师群体被忽视等。为改变这种状况,需要优先发展农村学前教育,政府必须成为促进农村幼儿教... 详细信息

近年来,城乡间学前教育差距明显拉大,社会分层化日趋明显,并出现了农村学前教育边缘化的趋向,主要表现为农村幼儿园师幼比远低于城市;农村幼儿教师群体被忽视等。为改变这种状况,需要优先发展农村学前教育,政府必须成为促进农村幼儿教育发展的主体,加大对农村学前教育的财政投入力度,改善农村幼儿教师待遇,提高教师素质。

关键词：教育公平学前教育城乡差距

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工科实践教学团队效能影响机制的实证研究

高等工程教育研究 2016年第3期64卷 181-186页

作者：张朝于宗富黄明东武汉大学教育科学研究院山东理工大学教育与心理科学系

本文根据团队效能的相关理论,探索工科实践教学团队效能的影响因素及其作用机理。在理论上构建和验证了团队效能(团队任务效能和团队关系效能)、共享心智模型(学习意愿共享、任务理解共享、队友认知共享、活动状态共享)、团队沟通(团队... 详细信息

本文根据团队效能的相关理论,探索工科实践教学团队效能的影响因素及其作用机理。在理论上构建和验证了团队效能(团队任务效能和团队关系效能)、共享心智模型(学习意愿共享、任务理解共享、队友认知共享、活动状态共享)、团队沟通(团队内部沟通和团队对外沟通)的结构和关系模型。研究表明,工科实践教学的团队沟通对共享心智模型具有正向预测作用;共享心智模型对团队效能具有正向预测作用;团队沟通对团队效能也具有正向预测作用;并证实了本文提出的其他8个假设。从整体结构方程模型看,在工科实践教学中,共享心智模型作为中介变量在团队沟通和团队效能之间起到完全中介作用。

关键词：工科实践教学团队沟通共享心智模型团队效能