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Resonant enhancement of second harmonic generation in etchless thin film lithium niobate heteronanostructure

Science China(Physics,Mechanics & Astronomy) 2022年第10期65卷 75-82页

作者： Zhijin Huang Kaiwen Luo Ziwei Feng Zhanyuan Zhang Yang Li Wentao Qiu heyuan guan Yi Xu Xiangping Li Huihui Lu guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Department of Optoelectronic EngineeringJinan UniversityGuangzhou 510632China guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Institute of Photonics TechnologyJinan UniversityGuangzhou 510632China guangdong Provincial Key Laboratory of Information Photonics Technology Institute of Advanced Photonics TechnologySchool of Information EngineeringGuangdong University of TechnologyGuangzhou 510006China

Lithium niobate has received interest in nonlinear frequency conversion due to its wide transparency window,from ultraviolet to mid-infrared spectral regions,and large second-order nonlinear susceptibility.However,its nanostructure is generally difficult to etch,resulting in low-Q resonance and lossy nanostructures for second harmonic generation.By applying the concept of bound states in the continuum,we performed theoretical and experimental investigations on high-Q resonant etchless thin-film lithium niobate with Si O_(2) nanostructures on top for highly efficient second harmonic generation.In the fabricated nanostructured devices,a resonance with a Q factor of 980 leads to the strong enhancement of second harmonic generation by over 1500 times compared with that in unpatterned lithium niobate thin film.Although the pump slightly deviates from central resonance,an absolute conversion efficiency of 6.87×10^(-7) can be achieved with the fundamental pump peak intensity of 44.65 MW/cm^(2),thus contributing to the normalized conversion efficiency of 1.54×10^(-5)cm^(2)/GW.Our work establishes an etchless lithium niobate device for various applications,such as integrated nonlinear nanophotonics,terahertz frequency generation,and quantum information processing.

关键词： second harmonic generation etchless thin-film lithium niobate heteronanostructure high-Q resonance

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Side Polished Fiber:A Versatile Platform for Compact Fiber Devices and Sensors

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Photonic Sensors 2023年第1期13卷 1-24页

作者： Linqing ZHUO Jieyuan TANG Wenguo ZHU Huadan ZHENG heyuan guan Huihui LU Yaofei CHEN Yunhan LUO Jun ZHANG Yongchun ZHONG Jianhui YU Zhe CHEN Key Laboratory of Optoelectronic Information and Sensing Technologies of guangdong Higher Education Institutes Department of Optoelectronic EngineeringJinan UniversityGuangzhou 510632China Engineering Research Center on Visible Light Communication of guangdong Province Department of Optoelectronic EngineeringJinan UniversityGuangzhou 510632China Key Laboratory of Visible Light Communications of guangzhou Jinan UniversityGuangzhou 510632China

Side polished fiber(SPF)has a controllable average roughness and length of the side-polishing region,which becomes a versatile platform for integrating multiple materials to interact with the evanescent field to fabricate all-fiber devices and sensors.It has been widely used in couplers,filters,polarizers,optical attenuators,photodetectors,modulators,and sensors for temperature,humidity,strain,biological molecules,chemical gas,and vector magnetic monitoring.In this article,an overview of the development history,fabrication techniques,fiber types,transmission characteristics,and varied recent applications of SPFs are reviewed.Firstly,the fabrication techniques of SPFs are reviewed,including the V-groove assisted polishing technique and wheel polishing technique.Then,the different types of SPFs and their characteristics are discussed.Finally,various applications of SPFs are discussed and concluded theoretically and experimentally,including their principles and structures.When designing the device,the residual thickness and polishing lengths of the SPF need to be appropriately selected in order to obtain the best performance.Developing all-fiber devices and sensors is aimed at practical usability under harsh environments and allows to avoid the high coupling loss between optical fibers and on-chip integrated devices.

关键词： Side polished fiber(SPF) V-groove assisted polishing technique wheel polishing technique lab-on-fiber fiberdevices sensors

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Resonance-assisted light–control–light characteristics of SnS_2 on a microfiber knot resonator with fast response

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Photonics Research 2018年第12期6卷 1137-1143页

作者： HUIHUI LU ZHONGMIN WANG ZHIJIN HUANG JUN TAO HANQING XIONG WENTAO QIU heyuan guan HUAZHUO DONG JIANGLI DONG WENGUO ZHU JIANHUI YU YONGCHUN ZHONG YUNHAN LUO JUN ZHANG ZHE CHEN guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Department of Optoelectronic EngineeringJinan University Key Laboratory of Optoelectronic Information and Sensing Technologies of guangdong Higher Education Institutes Jinan University

An all-optical light–control–light functionality with the structure of a microfiber knot resonator (MKR) coated with tin disulfide (SnS_2) nanosheets is experimentally demonstrated. The evanescent light in the MKR [with a resonance Q of ～59,000 and an extinction ratio (ER) of ～26 dB] is exploited to enhance light–matter interaction by coating a two-dimensional material SnS_2 nanosheet onto it. Thanks to the enhanced light–matter interaction and the strong absorption property of SnS_2, the transmitted optical power can be tuned quasi-linearly with an external violet pump light power, where a transmitted optical power variation rate ΔT with respect to the violet light power of ～0.22 dB∕mW is obtained. In addition, the MKR structure possessing multiple resonances enables a direct experimental demonstration of the relationship between resonance properties (such as Q and ER), and the obtained ΔT variation rate with respect to the violet light power. It verifies experimentally that a higher resonance Q and a larger ER can lead to a higher ΔT variation rate. In terms of the operating speed, this device runs as fast as ～3.2 ms. This kind of all-optical light–control–light functional structure may find applications in future all-optical circuitry, handheld fiber sensors, etc.

关键词： response fast experimental optical multiple pump can tin

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Tunable spin splitting of Laguerre–Gaussian beams in graphene metamaterials

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Photonics Research 2017年第6期5卷 203-207页

作者： WENGUO ZHU MENGJIANG JIANG heyuan guan JIANHUI YU HUIHUI LU JUN ZHANG ZHE CHEN guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Jinan University Department of Optoelectronic Engineering Jinan University Key Laboratory of Optoelectronic Information and Sensing Technologies of guangdong Higher Education Institutes Jinan University

Optical spin splitting has attracted significant attention owing to its potential applications in quantum information and precision metrology. However, it is typically small and cannot be controlled efficiently. Here, we enhance the spin splitting by transmitting higher-order Laguerre–Gaussian(LG) beams through graphene metamaterial slabs. The interaction between LG beams and metamaterial results in an orbital-angularmomentum-(OAM) dependent spin splitting. The upper bound of the OAM-dependent spin splitting is found,which varies with the incident OAM and beam waist. Moreover, the spin splitting can be flexibly tuned by modulating the Fermi energy of the graphene sheets. This tunable spin splitting has potential applications in the development of spin-based applications and the manipulation of mid-infrared waves.

关键词： EF OAM Tunable spin splitting of Laguerre Gaussian beams in graphene metamaterials

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Optimized weak measurement of orbital angular momentum-induced beam shifts in optical reflection

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Photonics Research 2019年第11期7卷 1273-1278页

作者： Wenjin Long Jintao Pan Xinyi Guo Xiaohe Liu Haolin Lin Huadan Zheng Jianhui Yu heyuan guan Huihui Lu Yongchun Zhong Shenhe Fu Li Zhang Wenguo Zhu Zhe Chen guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Jinan UniversityGuangzhou 510632China Department of Optoelectronic Engineering Jinan UniversityGuangzhou 510632China School of Physics and Optoelectronic Engineering Foshan UniversityFoshan 528000China

Tiny but universal beam shifts occur when a polarized light beam is reflected upon a planar interface.Although the beam shifts of Gaussian beams have been measured by the weak measurement technique, the weak measurement for orbital angular momentum(OAM)-induced spatial shifts of vortex beams is still missing.Here, by elaborately choosing the preselection and postselection states, the tiny OAM-induced Goos–H?nchen and Imbert–Fedorov shifts are amplified at an air–prism interface. The maximum shifts along directions both parallel and perpendicular to the incident plane are theoretically predicted and experimentally verified with optimal preselection and postselection states. These maximum shifts can be used to determine the OAM of vortex beams.

关键词： beam momentum angular

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Sensitivity-enhanced surface plasmon resonance sensor utilizing a tungsten disulfide (WS_2) nanosheets overlayer

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Photonics Research 2018年第6期6卷 485-491页

作者： HAO WANG HUI ZHANG JIANGLI DONG SHIQI HU WENGUO ZHU WENTAO QIU HUIHUI LU JIANHUI YU heyuan guan SHECHENG GAO ZHAOHUI LI WEIPING LIU MIAO HE JUN ZHANG ZHE CHEN YUNHAN LUO guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Jinan University School of Physics and Optoelectronic Engineering Guangdong University of Technology Key Laboratory of Optoelectronic Information and Sensing Technologies of guangdong Higher Education Institutes Jinan University Key Laboratory of Visible Light Communications of guangzhou Jinan University State Key Laboratory of Optoelectronic Materials and Technologies and School of Electronics and Information Technology Sun Yat-sen University

Tungsten disulfide(WS_2), as a representative layered transition metal dichalcogenide(TMDC) material, possesses important potential for applications in highly sensitive sensors. Here, a sensitivity-enhanced surface plasmon resonance(SPR) sensor with a metal film modified by an overlayer of WS_2 nanosheets is proposed and demonstrated. The SPR sensitivity is related to the thickness of the WS_2 overlayer, which can be tailored by coating a WS_2 ethanol suspension with different concentrations or by the number of times of repeated post-coating.Benefitting from its large surface area, high refractive index, and unique optoelectronic properties, the WS_2 nanosheet overlayer coated on the gold film significantly improves the sensing sensitivity. The highest sensitivity(up to 2459.3 nm∕RIU) in the experiment is achieved by coating the WS_2 suspension once. Compared to the case without a WS_2 overlayer, this result shows a sensitivity enhancement of 26.6%. The influence of the WS_2 nanosheet overlayer on the sensing performance improvement is analyzed and discussed. Moreover, the proposed WS_2 SPR sensor has a linear correlation coefficient of 99.76% in refractive index range of 1.333 to 1.360. Besides sensitivity enhancement, the WS_2 nanosheet overlayer is able to show additional advantages, such as protection of metal film from oxidation, tunability of the resonance wavelength region, biocompatibility, capability of vapor,and gas sensing.

关键词： Sensitivity-enhanced surface plasmon resonance sensor utilizing a tungsten disulfide nanosheets overlayer RIU

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统筹发展与安全战略下的国土空间规划:范式、学理和实践逻辑的反思与回应

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中国土地科学 2022年第6期36卷 11-20页

作者：谷玮王梦婧吴次芳游和远徐忠国李冠浙江大学公共管理学院浙江杭州310029 浙江大学土地与国家发展研究院浙江杭州310058 浙大城市学院国土空间规划学院浙江杭州310015 浙江财经大学公共管理学院浙江杭州310018 宁波大学法学院浙江宁波315211

研究目的:讨论国土空间语境下发展与安全的内涵及其相互关系,探讨面对统筹发展与安全的战略需求,国土空间规划在范式逻辑、学理逻辑和实施逻辑层面的反思与回应。研究方法:文献梳理法、演绎归纳法、规范性分析。研究结果:(1)发展和安全... 详细信息

研究目的:讨论国土空间语境下发展与安全的内涵及其相互关系,探讨面对统筹发展与安全的战略需求,国土空间规划在范式逻辑、学理逻辑和实施逻辑层面的反思与回应。研究方法:文献梳理法、演绎归纳法、规范性分析。研究结果:(1)发展和安全的内涵及其关系具有显著的时代性特征,工业文明社会和后工业文明社会中两者的矛盾更加突出;(2)国土空间规划对象是一个开放复杂系统,具有整体性和不确定性等特征,需加强系统科学等新思维范式的介入;(3)权力边界和能力边界约束下,国土空间规划的作用边界在于把控安全底线;(4)在生命优先、底线管控、整体协调和灰度动态的原则框架下,优化国土空间规划实践。研究结论:把握国土空间规划的时代性特征,从范式、学理和实践逻辑层面展开反思,在认知和实践上对国土空间规划进行改革和优化,是响应国家统筹发展与安全战略的重要路径。本文亦为国土空间规划和空间治理的优化提升提供了进一步思考的框架。

关键词：国土空间规划发展安全范式学理实践

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小区尺度雨洪过程模拟及径流分配特性研究

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水力发电学报 2024年第3期43卷 24-34页

作者：官保君侯精明李东来王添吕佳豪范臣臣高徐军申若竹黄绵松西安理工大学省部共建西北旱区生态水利国家重点实验室西安710048 中国电建集团西北勘测设计研究院有限公司西安710065 宁夏首创海绵城市建设发展有限公司宁夏固原756000

为了研究小区尺度地表径流各组分占比随不同重现期降雨的变化规律,以西咸新区天福和园小区为研究对象,采用GAST-SWMM耦合模型,以模拟时长及地形边界条件为变量进行研究分析。研究表明:经两场实测降雨过程验证,模型确定性系数分别为0.83... 详细信息

为了研究小区尺度地表径流各组分占比随不同重现期降雨的变化规律,以西咸新区天福和园小区为研究对象,采用GAST-SWMM耦合模型,以模拟时长及地形边界条件为变量进行研究分析。研究表明:经两场实测降雨过程验证,模型确定性系数分别为0.83和0.82,表明构建的一二维耦合模型精度较高;在本文设置的两种工况下,小区地表径流外排率和管网排水率均随降雨重现期增大而以渐进曲线形式增大,土壤下渗占比和地表填洼率随降雨重现期增大而减小;小区地表径流外排和管网排水主要发生在降雨期间,分别占各自排水总量的94.88%和94.36%;小区地形边界条件对径流过程模拟的影响不容忽视,在有围墙及无围墙工况下平均地表径流外排率分别为9.42%、22.55%。本研究可为地势相对四周较低区域的排水防涝设计提供参考。

关键词：城市内涝径流过程地表径流外排分区模型渐进曲线

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Recent progress of second harmonic generation based on thin film lithium niobate [Invited]

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Chinese Optics Letters 2021年第6期19卷 54-65页

作者：黎洋黄志进丘文涛董江莉关贺元卢惠辉 guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Jinan UniversityGuangzhou 510632China Key Laboratory of Optoelectronic Information and Sensing Technologies of guangdong Higher Education Institutes Jinan UniversityGuangzhou 510632China

Recently, nonlinear photonics has attracted considerable interest. Among the nonlinear effects, second harmonic generation(SHG) remains a hot research topic. The recent development of thin film lithium niobate(TFLN) technology has superior performances to the conventional counterparts. Herein, this review article reveals the recent progress of SHG based on TFLN and its integrated photonics. We mainly discuss and compare the different techniques of TFLN-based structures to boost the nonlinear performances assisted by localizing light in nanostructures and structured waveguides.Moreover, our conclusions and perspectives indicate that more efficient methods need to be further explored for higher SHG conversion efficiency on the TFLN platform.

关键词： thin film lithium niobate second harmonic generation waveguide nanostructure

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比较视域下中美高校薪酬影响因素研究

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中国人事科学 2022年第7期 25-32页

作者：郑婕慧吴晓伟关贺元暨南大学人力资源开发与管理处

新时代教育评价改革和新时代教师队伍建设,都要求推进高校薪酬制度改革,完善高校内部收入分配激励机制。在“双一流”和“高水平”大学建设的背景下,如何确定合理的薪酬水平,成为当前各界广泛关注并亟待解决的问题。运用高等教育学会薪... 详细信息

新时代教育评价改革和新时代教师队伍建设,都要求推进高校薪酬制度改革,完善高校内部收入分配激励机制。在“双一流”和“高水平”大学建设的背景下,如何确定合理的薪酬水平,成为当前各界广泛关注并亟待解决的问题。运用高等教育学会薪酬管理研究分会的薪酬调查数据和美国大学教授协会(AAUP)的教师工资统计数据,对我国和美国高校教师薪酬影响因素进行比较分析,可以发现,学科、地区以及学校的类型等因素均对教师群体的整体薪酬水平有显著影响,而考核绩效则是对教师个体薪酬水平影响的主要因素。当前迫切需要整体优化教师薪酬制度;调整工资结构,提高薪酬的保障水平;设置地区和学校层次的系数,规范市场化定价行为;以增加知识价值为导向,内部分配向关键、创新和突出贡献倾斜。

关键词：中美高校高校薪酬薪酬制度薪酬水平影响因素

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