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High-performance silicon−graphene hybrid plasmonic waveguide photodetectors beyond 1.55μm

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Light(Science & Applications) 2020年第1期9卷 1731-1741页

作者： Jingshu Guo Jiang Li Chaoyue Liu Yanlong Yin Wenhui Wang Zhenhua Ni Zhilei Fu Hui Yu Yang Xu Yaocheng Shi Yungui Ma Shiming Gao limin tong Daoxin Dai State Key Laboratory for Modern Optical Instrumentation Zhejiang Provincial Key Laboratory for Sensing TechnologiesCollege of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang UniversityZijingang Campus310058 HangzhouChina Ningbo Research Institute Zhejiang University315100 NingboChina Department of Physics and Key Laboratory of MEMS of the Ministry of Education Southeast University211189 NanjingChina College of Information Science and Electronic Engineering Zhejiang University310027 HangzhouZhejiangChina

Graphene has attracted much attention for the realization of high-speed photodetection for silicon photonics over a wide wavelength ***,the reported fast graphene photodetectors mainly operate in the 1.55μm wavelength *** this work,we propose and realize high-performance waveguide photodetectors based on bolometric/photoconductive effects by introducing an ultrathin wide silicon−graphene hybrid plasmonic waveguide,which enables efficient light absorption in graphene at 1.55μm and *** operating at 2μm,the present photodetector has a responsivity of ~70 mA/W and a setup-limited 3 dB bandwidth of >20 *** operating at 1.55μm,the present photodetector also works very well with a broad 3 dB bandwidth of >40 GHz(setup-limited)and a high responsivity of ~0.4 A/W even with a low bias voltage of−0.3 *** work paves the way for achieving highresponsivity and high-speed silicon-graphene waveguide photodetection in the near/mid-infrared ranges,which has applications in optical communications,nonlinear photonics,and on-chip sensing.

关键词： waveguide beyond performance

Single optical microfiber enabled tactile sensor for simultaneous temperature and pressure measurement

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Photonics Research 2022年第9期10卷 2040-2046页

作者： NI YAO XIAOYU WANG SHUQI MA XINGDA SONG SHAN WANG ZHANGXING SHI JING PAN SHIPENG WANG JIANLIANG XIAO HAITAO LIU LONGTENG YU YAO TANG ZHANG ZHANG XIONG LI WEI FANG LEI ZHANG limin tong Research Center for Humanoid Sensing Zhejiang LabHangzhou 311121China State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou 310027China Shandong Institute of Advanced Technology Jinan 250100China Tencent Robotics X Lab Tencent Technology(Shenzhen)Co.LtdShenzhen 518054China

The ability to sense heat and touch is essential for healthcare,robotics,and human–machine *** taking advantage of the engineerable waveguiding properties,we design and fabricate a flexible optical microfiber sensor for simultaneous temperature and pressure measurement based on theoretical *** sensor exhibits a high temperature sensitivity of 1.2 nm/℃ by measuring the shift of a high-order mode cutoff wavelength in the short-wavelength *** the case of pressure sensing,the sensor shows a sensitivity of 4.5%per kilopascal with a fast temporal frequency response of 1000 Hz owing to the strong evanescent wave guided outside the *** cross talk is negligible because the temperature and pressure signals are measured at different wavelengths based on different *** properties of fast temporal response,high temperature,and pressure sensitivity enable the sensor for real-time skin temperature and wrist pulse measurements,which is critical to the accurate analysis of pulse *** believe the sensor will have great potential in wearable optical devices ranging from healthcare to humanoid robots.

关键词： simultaneous optical sensor

Ultrasensitive skin‐like wearable optical sensors based on glass micro/nanofibers

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Opto-Electronic Advances 2020年第3期3卷 18-24页

作者： Lei Zhang Jing Pan Zhang Zhang Hao Wu Ni Yao Dawei Cai Yingxin Xu Jin Zhang Guofei Sun Liqiang Wang Weidong Geng Wenguang Jin Wei Fang Dawei Di limin tong State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou 310027China College of Computer Science and Technology Zhejiang UniversityHangzhou 310027China College of Information Science and Electronic Engineering Zhejiang UniversityHangzhou 310027China Cavendish Laboratory University of CambridgeJJ Thomson AvenueCambridge CB30HEUnited Kingdom

Electronic skin,a class of wearable electronic sensors that mimic the functionalities of human skin,has made remarkable success in applications including health monitoring,human-machine interaction and electronic-biological *** electronic skin continues to achieve higher sensitivity and faster response,its ultimate performance is fundamentally limited by the nature of low-frequency AC ***,highly sensitive skin-like wearable optical sensors are demonstrated by embedding glass micro/nanofibers(MNFs)in thin layers of polydimethylsiloxane(PDMS).Enabled by the transition from guided modes into radiation modes of the waveguiding MNFs upon external stimuli,the skin-like optical sensors show ultrahigh sensitivity(1870 k·Pa^-1),low detection limit(7 mPa)and fast response(10μs)for pressure sensing,significantly exceeding the performance metrics of state-of-the-art electronic *** interference(EMI)-free detection of high-frequency vibrations,wrist pulse and human voice are ***,a five-sensor optical data glove and a 2×2-MNF tactile sensor are *** initial results pave the way toward a new category of optical devices ranging from ultrasensitive wearable sensors to optical skins.

关键词： optical micro/nanofiber pressure sensor tactile sensor wearable sensor

Highly sensitive and fast response strain sensor based on evanescently coupled micro/nanofibers

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Opto-Electronic Advances 2022年第9期5卷 34-42页

作者： Wen Yu Ni Yao Jing Pan Wei Fang Xiong Li limin tong Lei Zhang State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou 310027China Research Center for Intelligent Sensing Zhejiang LabHangzhou 311121China Tencent Robotics X Lab Tencent Technology(Shenzhen)Co.LtdShenzhen 518054China

Flexible strain sensors play an important role in electronic skins,wearable medical devices,and advanced ***,a highly sensitive and fast response optical strain sensor with two evanescently coupled optical micro/nanofibers(MNFs)embedded in a polydimethylsiloxane(PDMS)film is *** strain sensor exhibits a gauge factor as high as 64.5 for strain≤0.5%and a strain resolution of 0.0012%which corresponds to elongation of 120 nm on a 1 cm long *** a proof-of-concept,highly sensitive fingertip pulse measurement is *** properties of fast temporal frequency response up to 30 kHz and a pressure sensitivity of 102 kPa^(−1) enable the sensor for sound *** versatile sensor could be of great use in physiological signal monitoring,voice recognition and micro-displacement detection.

关键词： optical micro/nanofiber strain sensor pressure sensor micro-displacement directional coupler

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光流控微纳光纤传感器

激光与光电子学进展 2019年第17期56卷 210-222页

作者：许悦张磊童利民浙江大学光电科学与工程学院

微纳光纤(MNF)是直径接近或小于光波长的一种新型光纤。近年来,微纳光纤因在光流控传感器方面的重要应用受到了广泛关注。首先简要介绍了微纳光纤的制备方法和导波特性,然后重点介绍了强度调制型和相位调制型光流控微纳光纤传感器在高... 详细信息

微纳光纤(MNF)是直径接近或小于光波长的一种新型光纤。近年来,微纳光纤因在光流控传感器方面的重要应用受到了广泛关注。首先简要介绍了微纳光纤的制备方法和导波特性,然后重点介绍了强度调制型和相位调制型光流控微纳光纤传感器在高灵敏、快响应、小尺寸生化传感中的研究进展,最后对光流控微纳光纤传感器的研究及应用进行了总结及展望。

关键词：光纤光学传感器光纤传感器微纳光纤光流控

An Evanescent Coupling Approach for Optical Characterization of ZnO Nanowires

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Journal of Semiconductors 2006年第3期27卷 425-428页

作者：杨青楼静漪杨德仁童利民浙江大学硅材料国家重点实验室杭州310027 浙江大学现代光学仪器国家重点实验室杭州310027

Using a nanoscale silica fiber taper,light can be efficiently coupled into a single ZnO nanowire by means of evanescent coupling. The method is valid for launching light into a single nanowire in the ultraviolet to infrared range with a coupling efficiency of 25%, Low-loss optical guiding of ZnO nanowires is demonstrated, and the photoluminescence of a single ZnO nanowire is also observed. Compared to conventional approaches in which a lensfocused laser beam is used to excite nanowires at specific wavelengths,this evanescent coupling approach has advantages such as high coupling efficiency and broad-band validity, and it is promising for the optical characterization of semiconductor nanowires or nanoribbons.

关键词： ZnO nanowire evanescent coupling optical characterization

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微纳光纤及其锁模激光应用

光学学报 2019年第1期39卷 181-199页

作者：王利镇李林军童利民浙江大学光电科学与工程学院现代光学仪器国家重点实验室浙江杭州310027

微纳光纤是一种直径接近或小于传输光波长的纤维波导,由于纤芯和包层折射率差较大,具有强光场约束、强倏逝场、低损耗、反常波导色散、表面均匀性好和机械性能高等特性。近年来,以纳米材料作为饱和吸收体的被动锁模激光器成为超短脉冲... 详细信息

微纳光纤是一种直径接近或小于传输光波长的纤维波导,由于纤芯和包层折射率差较大,具有强光场约束、强倏逝场、低损耗、反常波导色散、表面均匀性好和机械性能高等特性。近年来,以纳米材料作为饱和吸收体的被动锁模激光器成为超短脉冲激光技术方向的研究热点。得益于微纳光纤的强光场约束能力及大比例倏逝场,纳米材料与微纳光纤的复合结构能显著增强光与物质的相互作用,进而降低该复合结构的饱和吸收阈值,为超短脉冲产生和非线性动力学等研究提供一个新颖而灵活的平台。同时,微纳光纤因具有反常波导色散、光谱滤波、饱和吸收和偏振敏感等特性,在激光器的色散调控、偏振锁模等方面获得应用。介绍了微纳光纤的制备和特性以及在锁模激光方面的典型应用和相关技术的最新进展,并就未来的发展方向进行了展望。

关键词：微纳光纤锁模激光器饱和吸收体色散调控

Single whispering-gallery mode lasing in polymer bottle microresonators via spatial pump engineering

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Light(Science & Applications) 2017年第1期6卷 490-496页

作者： Fuxing Gu Fuming Xie Xing Lin Shuangyi Linghu Wei Fang Heping Zeng limin tong Songlin Zhuang Shanghai Key Laboratory of Modern Optical Systems Engineering Research Center of Optical Instrument and System(Ministry of Education)University of Shanghai for Science and TechnologyShanghai 200093China State Key Laboratory of Modern Optical Instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou 310027China State Key Laboratory of Precision Spectroscopy East China Normal UniversityShanghai 200062China

Single-mode lasing in whispering-gallery mode(WGM)microresonators is challenging to *** bottle microresonators,the highly non-degenerated WGMs are spatially well-separated along the long-axis direction and provide mode-selection *** this work,by engineering the pump intensity to modify the spatial gain profiles of bottle microresonators,we demonstrate a simple and general approach to realizing single-mode WGM lasing in polymer bottle *** pump intensity is engineered into an interference distribution on the bottle microresonator *** tuning the spacing between axial positions of the interference pump patterns,the mode intensity profiles of single-bottle WGMs can be spatially overlapped with the interference stripes,intrinsically enabling single-mode lasing and *** advantages of the system,including high sidemode suppression factors 420 dB,large spectral tunability 48 nm,low-lasing threshold and reversible control,are *** demonstrated approach may have a variety of promising applications,ranging from tunable single-mode lasing and sensing to nonlinear optics.

关键词： bottle microresonators polymer single-mode lasing spatial pump engineering whispering-gallery modes

21世纪社会保险制度面临三重挑战：老龄化、全球化和信息化

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社会科学 2009年第3期 42-48页

作者：仝利民王西民华东理工大学社会学院讲师上海财经大学《财经研究》编辑上海200433

社会保险制度最早产生于19世纪80年代的德国,是俾斯麦政府为了维护社会秩序的稳定和构筑社会安全网而推出的重要的社会保障制度,也得到了后续更多工业化国家的积极响应。这一制度不仅实现了由传统家庭保障向现代社会保障的转变,而且实... 详细信息

社会保险制度最早产生于19世纪80年代的德国,是俾斯麦政府为了维护社会秩序的稳定和构筑社会安全网而推出的重要的社会保障制度,也得到了后续更多工业化国家的积极响应。这一制度不仅实现了由传统家庭保障向现代社会保障的转变,而且实现了工业社会的快速发展和人民生活水平的极大提高。但是当人类跨入21世纪,面临人口老龄化、经济全球化和科技信息化的挑战,如何建立可持续发展的社会保险制度,成为考验世界各国政府智慧的一道难题。

关键词：社会保险老龄化全球化信息化