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

doi:10.1364/AO.49.006463

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

^*Corresponding author for this work

School of Mechanical Engineering

Research output: Contribution to journal › Article › peer-review

32 Citations (Scopus)

Abstract

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 language	English
Pages (from-to)	6463-6471
Number of pages	9
Journal	Applied Optics
Volume	49
Issue number	33
DOIs	https://doi.org/10.1364/AO.49.006463
Publication status	Published - 20 Nov 2010

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AU - Lu, Yongfeng

AU - Tsai, Hailung

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AB - 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.

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

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