Ultrasensitive chemical sensors based on whispering gallery modes in a microsphere coated with zeolite

Nai Lin, Lan Jiang, Sumei Wang, Lei Yuan, Hai Xiao, Yongfeng Lu, Hailung Tsai

Research output: Contribution to journalArticle

28 Scopus citations


We propose a highly sensitive chemical sensor by functionally coating a zeolite film on the external surface of an optical microsphere. Using the perturbation theory, a model is developed to calculate sensor sensitivity and analyze the impact of the zeolite film thickness. The quality factor and detection limit are also investigated by using an approximate model. Simulations show that a zeolite coating can effectively increase sensitivity. The results provide physical insights for the design and optimization of various parameters for desired sensor performance.

Original languageEnglish (US)
Pages (from-to)6463-6471
Number of pages9
JournalApplied optics
Issue number33
StatePublished - Nov 20 2010


ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Engineering (miscellaneous)
  • Electrical and Electronic Engineering

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