Home > Archive>Volume 14, Issue 5, 2018 >331-335. DOI:https://doi.org/10.1007/s11801-018-8056-3
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Numerical research on whispering-gallery modes in a triple-layer-coated microsphere resonator
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Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei 230027, China

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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 evanescent radiation field. By changing the gap between the microsphere and waveguide, the WGMs of two high-RI layers are efficiently excited. The stored energy and the mode volume are optimized for sensing applications. The coupling structure reveals a good sensitivity of 38.29 nm/RIU (RI unit).

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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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History
  • Received:April 14,2018
  • Revised:May 24,2018
  • Online: March 26,2019
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