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2D-material-integrated whispering-gallery-mode microcavity

Photonics Research 2019年第8期7卷 905-916页

作者： LU WANG XUEFEI ZHOU SHUO YANG GAOSHAN HUANG YONGFENG MEI Department of Materials Science and State Key Laboratory of ASIC and System Fudan University

Optical microcavities, which support whispering gallery modes, have attracted tremendous attention in both fundamental research and potential applications. The emerging of two-dimensional materials offers a feasible solution to improve the performance of traditional microcavity-based optical devices. Besides, the integration of two-dimensional materials with microcavities will benefit the research of heterogeneous materials on novel devices in photonics and optoelectronics, which is dominated by the strongly enhanced light–matter *** review focuses on the research of heterogeneous two-dimensional-material whispering-gallery-mode microcavities, opening a myriad of lab-on-chip applications, such as optomechanics, quantum photonics, comb generation, and low-threshold microlasing.

关键词： 2D-material-integrated whispering-gallery-mode microcavity Optical microcavities

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STUDY OF CROSSED FIELD GYROTRON OPERATING ON whispering-gallery mode

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Journal of Electronics(China) 1991年第1期8卷 1-9页

作者：罗积润张世昌 Institute of Electronics Academia Sinica Beijing

A linear and nonlinear analysis of crossed-field gyrotron operating on whispering-gallery mode TEm11 is presented. The detailed discussions are given for the starting oscillationcondition, the effect of the internal conductor in coaxial cavity on the cut-off frequency of modeand the spacing between adjacent modes as well as the effect of the applied voltage on thecyclotron frequency of electron, the starting oscillation beam power and the electron *** is shown that the efficiency of 41% can be attained for m=2. A comparison of these resultswith those in cylindrical cavity is made. The analyses are helpful for the engineering design.

关键词： Gyrotron whispering-gallery-mode Starting oscillation condition Beam-wave interaction

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Linearly polarised three-colour lasing emission from an evanescent wave pumped and gain coupled fibre laser

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Chinese Physics B 2010年第5期19卷 313-319页

作者：普小云江楠韩德昱冯永利任一涛 Department of Physics Yunnan University

A novel whispering-gallery-mode （WGM） fibre laser, emitting linearly polarised three-colour light, is demonstrated by pumping and gain coupling with evanescent waves. The pump light is longitudinally coupled into a bare optical fibre immersed in a dye solution of lower refractive index. The dye molecules around the bare fibre are excited by the evanescent waves of pump light when they propagate along the fibre in a total internal reflection. When the pump beam within the fibre is a meridian beam, the WGM lasing emission from the fibre laser is a linearly polarised transverse electric wave, while it is a mixed wave of the linearly polarised transverse electric and magnetic waves if the pump beam is a skew beam within the fibre. Because the excited molecules are located within the evanescent field of WGM, a good spatial overlap between the dye gain and the evanescent field leads to a high pumping efficiency and a longer gain distance along the fibre. Once the bare fibre is inserted into three glass capillaries filled with Rhodamine 6G, 610 and 640 dye solutions, respectively, WGM laser oscillations at the wavelengths of 567-575, 605-614 and 656-666 nm occur simultaneously, and a linearly polarised three-colour lasing emission is achieved in a single optical fibre.

关键词： fibre laser whispering-gallery-mode evanescent wave polarisation

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Plasmon enhancement for Vernier coupled single-mode lasing from ZnO/Pt hybrid microcavities

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Nano Research 2017年第10期10卷 3447-3456页

作者： Yueyue Wang Feifei Qin Junfeng Lu Jitao Li Zhu Zhu Qiuxiang Zhu Ye Zhu Zengliang Shi Chunxiang Xu State Key Laboratory of Bioelectronics School of Biological Science & Medical Engineering Southeast University Nanjing 210096 China School of Sciences Zhejiang A&F University Lin'an 311300 China

It is essential to develop a single mode operation and improve the performance of lasing in order to ensure practical applicability of microlasers and nanolasers. In this paper, two hexagonal microteeth with varied nanoscaled air-gaps of a ZnO microcomb are used to construct coupled whispering-gallery cavities. This is done to achieve a stable single mode lasing based on Vernier effect without requiring any complicated or sophisticated manipulation to achieve positioning with nanoscale precision. Optical gain and the corresponding ultraviolet lasing performance were improved greatly through coupling with localized surface plasmons of Pt nanoparticles. The ZnO/Pt hybrid microcavities achieved a seven-fold enhancement of intensity of single mode lasing with higher side- mode suppression ratio and lower threshold. The mechanism that led to this enhancement has been described in detail.

关键词： ZnO/Pt microcavities whispering-gallery-mode single mode lasing Vernier effect surface plasmon coupling ZnO microrod

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