Optoelectronics Letters

, Volume 14, Issue 5, pp 331–335 | Cite as

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

  • Meng-Yu Wang (王梦宇)
  • Xue-Ying Jin (金雪莹)
  • Ke-Yi Wang (王克逸)Email author


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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Copyright information

© Tianjin University of Technology and Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  • Meng-Yu Wang (王梦宇)
    • 1
  • Xue-Ying Jin (金雪莹)
    • 1
  • Ke-Yi Wang (王克逸)
    • 1
    Email author
  1. 1.Department of Precision Machinery and Precision InstrumentationUniversity of Science and Technology of ChinaHefeiChina

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