Cross-sectional optimization of whispering-gallery mode sensor with high electric field intensity in the detection domain

Akihiro Takezawa, Masanobu Haraguchi, Toshihiro Okamoto, Mitsuru Kitamura

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Optimal cross-sectional shapes for whispering-gallery mode sensors with prescribed emission wavelengths and resonance modes are generated through topology optimization based on the finite element method. The sensor is assumed to detect the state of the domain surrounded by the sensor. We identified the integral of the square of the electric field intensity over the detection domain and the quality factor (Q factor), which should be maximized, as key values for the sensor sensitivity, representing the detection limit for the relative permittivity change of the test object. Based on this, the integral of the square of the electric field intensity over the detection domain and the Q factor are studied as the optimization targets. In our numerical study, their optimal configuration characteristics are identified and analyzed. The resulting device has a small radius, a small detection domain and a concave shape with a center located next to the detection domain. We also succeeded in performing simultaneous optimization of the integral of the square of the electric field intensity over the detection domain and the Q factor.

Original languageEnglish
Article number6810133
Pages (from-to)381-390
Number of pages10
JournalIEEE Journal on Selected Topics in Quantum Electronics
Volume20
Issue number6
DOIs
Publication statusPublished - 2014

Keywords

  • Design optimization
  • finite element method
  • optical resonators
  • optical sensors
  • whispering gallery modes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering

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