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Free spectral range magnetic tuning of an integrated microcavity

Fundamental Research 2023年第3期3卷 351-355页

作者： Yuechen Lei Zhi-Gang Hu Min Wang Yi-Meng Gao zhanchun zuo Xiulai Xu Bei-Bei Li Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100094China Songshan Lake Materials Laboratory DongguanGuangdong 523808China State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of PhysicsPeking UniversityBeijing 100871China

Tunable whispering-gallery-mode(WGM)microcavities are promising devices for reconfigurable photonic applications such as widely tunable integrated lasers and reconfigurable optical filters for optical communication and information *** up these devices demands the ability to tune the optical resonances in an integrated manner over a full free spectral range(FSR).Here we propose a high-speed full FSR magnetic tuning scheme of an integrated silicon nitride(Si_(3)N_(4))double-disk *** coating a magnetostrictive film on the spokes and the central pad of the Si_(3)N_(4) cavity,magnetic tuning can be realized using a microcoil integrated on the same *** FSR tuning can be achieved by combining magnetostrictive strain with strong optomechanical interactions provided by the double-disk *** calculate the required magnetic flux density to tune an FSR(B_(FSR))as a function of several key geometric parameters,including the air gap,radius,width of the spokes and ring of the double-disk cavities,as well as the thickness of the magnetostrictive *** proposed structure enables a full FSR tuning with a required magnetic flux density of milli-Tesla(mT)*** also study the dynamic response of the integrated device with an alternating current(AC)magnetic field driving,and find that the tuning speed can reach hundreds of kHz in the air.

关键词： Optical microcavities Tunable microcavities Optomechanics Magnetic tuning Integrated photonic devices

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Transport of a topologically protected photonic waveguide on-chip

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Photonics Research 2023年第6期11卷 1021-1028页

作者： SAI YAN JINGNAN YANG SHUSHU SHI zhanchun zuo CAN WANG XIULAI XU Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China CAS Center for Excellence in Topological Quantum Computation and School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of PhysicsPeking UniversityBeijing 100871China Songshan Lake Materials Laboratory Dongguan 523808China

We propose a design on integrated optical devices on-chip with an extra width degree of freedom by using a photonic crystal waveguide with Dirac points between two photonic crystals with opposite valley Chern *** such an extra waveguide,we demonstrate numerically that the topologically protected photonic waveguide retains properties of valley-locking and immunity to *** to the design flexibility of the width-tunable topologically protected photonic waveguide,many unique on-chip integrated devices have been proposed,such as energy concentrators with a concentration efficiency improvement of more than one order of magnitude,and a topological photonic power splitter with an arbitrary power splitting *** topologically protected photonic waveguide with the width degree of freedom could be beneficial for scaling up photonic devices,and provides a flexible platform to implement integrated photonic networks on-chip.

关键词： waveguide protected valley

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Micropascal-sensitivity ultrasound sensors based on optical microcavities

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光子学研究:英文版 2023年第7期11卷 1139-1147页

作者： HAO YANG XUENING CAO ZHI-GANG HU YIMENG GAO YUECHEN LEI MIN WANG zhanchun zuo XIULAI XU BEI-BEI LI Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China Songshan Lake Materials Laboratory Dongguan 523808China State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics School of PhysicsPeking UniversityBeijing 100871China

Whispering gallery mode(WGM)microcavities have been widely used for high-sensitivity ultrasound detection,owing to their optical and mechanical dual-resonance enhanced *** ultrasound sensitivity of the cavity optomechanical system is fundamentally limited by thermal *** this work,we theoretically and experimentally investigate the thermal-noise-limited sensitivity of a WGM microdisk ultrasound sensor and optimize the sensitivity by varying the radius and a thickness of the microdisk,as well as using a trench structure around the *** a microdisk with a radius of 300μm and thickness of 2μm,we achieve a peak sensitivity of 1.18μPa Hz^(-1/2)at 82.6 k *** the best of our knowledge,this represents the record sensitivity among cavity optomechanical ultrasound *** high sensitivity has the potential to improve the detection range of air-coupled ultrasound sensing technology.

关键词： technology radius pascal

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Diabolical points in coupled active cavities with quantum emitters

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Light(Science & Applications) 2020年第1期9卷 1943-1950页

作者： Jingnan Yang Chenjiang Qian Xin Xie Kai Peng Shiyao Wu Feilong Song Sibai Sun Jianchen Dang Yang Yu Shushu Shi Jiongji He Matthew JSteer Iain GThayne Bei-Bei Li Fang Bo Yun-Feng Xiao zhanchun zuo Kuijuan Jin Changzhi Gu Xiulai Xu Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China CAS Center for Excellence in Topological Quantum Computation and School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China School of Engineering University of GlasgowGlasgow G128LTUK The MOE Key Laboratory of Weak Light Nonlinear Photonics TEDA Applied Physics Institute and School of PhysicsNankai UniversityTianjin 300457China State Key Laboratory for Mesoscopic Physics and Collaborative Innovation Center of Quantum Matter School of PhysicsPeking UniversityBeijingChina Songshan Lake Materials Laboratory Dongguan 523808 GuangdongChina

In single microdisks,embedded active emitters intrinsically affect the cavity modes of the microdisks,resulting in trivial symmetric backscattering and low *** we demonstrate macroscopic control of the backscattering direction by optimizing the cavity *** signature of the positive and negative backscattering directions in each single microdisk is confirmed with two strongly coupled ***,diabolical points are achieved at the resonance of the two microdisks,which agrees well with theoretical calculations considering the backscattering *** points in active optical structures pave the way for an implementation of quantum information processing with geometric phase in quantum photonic networks.

关键词： quantum backscattering directions

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Large Photoluminescence Enhancement by an Out-of-Plane Magnetic Field in Exfoliated WS2 Flakes

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Chinese Physics Letters 2020年第8期37卷 156-161页

作者： Sibai Sun Jianchen Dang Xin Xie Yang Yu Longlong Yang Shan Xiao Shiyao Wu Kai Peng Feilong Song Yunuan Wang Jingnan Yang Chenjiang Qian zhanchun zuo Xiulai Xu Beijing National Laboratory for Condensed Matter Physics Institute of PhysicsChinese Academy of SciencesBeijing 100190China CAS Center for Excellence in Topological Quantum Computation and School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Key Laboratory of Luminescence and Optical Information(Ministry of Education) Beijing Jiaotong UniversityBeijing 100044China Songshan Lake Materials Laboratory Dongguan 523808China

We report an out-of-plane magnetic field induced large photoluminescence enhancement in WS2 flakes at 4K,in contrast to the photoluminescence enhancement provided by an in-plane field in *** mechanisms for the enhancement are *** is a larger overlap of the electron and hole caused by the magnetic field induced *** other is that the energy difference between varLambda and K valleys is reduced by magnetic field,and thus enhancing the corresponding indirect-transition ***,the Landé g factor of the trion is measured to be-0.8,whose absolute value is much smaller than normal exciton,which is around-4.A model for the trion gfactor is presented,confirming that the smaller absolute value of the Landé g factor is a behavior of this A–*** extending the valley space,we believe this work provides a further understanding of the valleytronics in monolayer transition metal dichalcogenides.

关键词： WS2 valley absolute

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利用两台独立激光器的拍频方法监测激光频率的锁定

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曲阜师范大学学报（自然科学版） 2013年第1期39卷 63-66页

作者：马征芦小刚裴丽娅左战春夏云杰曲阜师范大学物理工程学院山东省曲阜市273165 中国科学院物理研究所光物理实验室北京市100190

采用两束独立激光拍频的方法,利用中心波长为780 nm的TOPTICA半导体激光器作为参考光对另一台中心波长为780 nm的MOGLABS半导体激光器锁定频率的稳定性进行监测.为了获得最优的拍频信号,对拍频条件进行了观测,分析了待测激光的光强、待... 详细信息

采用两束独立激光拍频的方法,利用中心波长为780 nm的TOPTICA半导体激光器作为参考光对另一台中心波长为780 nm的MOGLABS半导体激光器锁定频率的稳定性进行监测.为了获得最优的拍频信号,对拍频条件进行了观测,分析了待测激光的光强、待测激光束与参考激光束的夹角及其偏振方向夹角对拍频信号的影响.在拍频信号最优的情况下,得到拍频信号的漂移量为1.804 MHz,可以认为待测激光的锁定频率是比较稳定的.拍频的方法为激光频率的锁定提供了一种有效的监测手段.

关键词：光学测量半导体激光器拍频频率漂移量

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