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Numerical research on whispering-gallery modes in a triple-layer-coated microsphere resonator

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Abstract

We numerically demonstrate that whispering-gallery modes (WGMs) in a microsphere resonator with three layers of high, low and high refractive index (RI) are analyzed by using the finite difference time domain (FDTD) method. To make the light couple in and out of the microsphere, a phase matched waveguide is used to overlap the WGMs eva-nescent radiation field. By changing the gap between the microsphere and waveguide, the WGMs of two high-RI lay-ers are efficiently excited. The stored energy and the mode volume are optimized for sensing applications. The cou-pling structure reveals a good sensitivity of 38.29 nm/RIU (RI unit).

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DOI:10.1007/s11801-018-8056-3

所属栏目:Devices

基金项目:This work has been supported by the National Natural Science Foundation of China (Nos.61775209 and 61275011).

收稿日期:2018-04-14

修改稿日期:2018-05-24

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WANG Meng-yu:Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei 230027, China
JIN Xue-ying:Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei 230027, China
WANG Ke-yi:Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei 230027, China

联系人作者:WANG Ke-yi(kywang@mail.ustc.edu.cn)

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引用该论文

WANG Meng-yu,JIN Xue-ying,WANG Ke-yi. Numerical research on whispering-gallery modes in a triple-layer-coated microsphere resonator[J]. 光电子快报(英文版), 2018, 14(5): 331-335

WANG Meng-yu,JIN Xue-ying,WANG Ke-yi. Numerical research on whispering-gallery modes in a triple-layer-coated microsphere resonator[J]. Optoelectronics Letters, 2018, 14(5): 331-335

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