Parametric studies of whispering-gallery mode resonators

Haiyong Quan, Zhixiong Guo, Stanley Pau

Research output: Contribution to journalConference articlepeer-review

9 Scopus citations


This report characterizes the whispering-gallery mode (WGM) resonators with the design of waveguide and microdisk coupling microstructure. In order to understand and optimize the design, studies over a broad range of resonator configuration parameters including the microdisk size, the gap separating the microdisk and waveguide, and the waveguide width are numerically conducted. The finite element method is used for solving the Maxwell's equations which govern the propagation of electromagnetic (EM) field and the radiation energy transport hi the micro/nano-structured WGM systems. The EM field and the radiation energy distributions in the WGM resonator are obtained and compared between the on-resonance and off-resonance cases. A very brilliant ring with strong EM field and high radiation intensity is found inward the peripheral surface of the microdisk under the first-order resonance. While under the second-order resonance, there are two bright rings; and the outer ring inward the peripheral surface is thin and weaker than the internal ring. The microdisk size affects significantly the resonant frequencies and their intervals. The gap also has a slight effect on the resonant frequencies. The effect of waveguide width on the resonant frequencies is negligible. However, the gap as well as the waveguide width does obviously influence the qualify factor and the finesse of the resonant modes.

Original languageEnglish (US)
Article number97
Pages (from-to)593-602
Number of pages10
JournalProceedings of SPIE - The International Society for Optical Engineering
StatePublished - 2004
EventNanosensing Materials and Devices - Philadelphia, PA, United States
Duration: Oct 25 2004Oct 28 2004


  • Finite element method
  • Frequency shift
  • Microcavity
  • Miniature sensor
  • Nanoscale detection
  • Near-field optics
  • Optical resonance
  • Simulation
  • Waveguide
  • Whispering-gallery mode

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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