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Sensors 2008, 8(10), 6761-6768; doi:10.3390/s8106761

Modeling of an Optical Sensor Based on Whispering Gallery Modes (WGMs) on the Surface Guiding Layer of Glass Filaments

,  and *
Department of Physics, the State Key Laboratory on Fiber Optic Local Area Communication Networks and Advanced Optical Communication Systems, Shanghai Jiao Tong University, 800, Dong Chuan Road, Shanghai, 200240, China
* Author to whom correspondence should be addressed.
Received: 22 September 2008 / Revised: 10 October 2008 / Accepted: 24 October 2008 / Published: 28 October 2008
(This article belongs to the Section Chemical Sensors)
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A ring-resonator-based refractive index sensor is proposed in this paper. Glass filaments with surface guiding layers created by ion exchange are crossed with a fiber taper to act as a ring resonator sensor. Theoretical simulation of the sensor response is proposed, and optimization of structural parameters including thickness and refractive index of the surface guiding layer and the diameter of the ring resonator for higher sensitivity is investigated. Results show that a detection limit of a variation of ~10-5RIU can be reached. Due to its simple fabrication and easy manipulation as well as good sensing performance, we believe such a micro-cavity sensor will find potential applications in high sensitivity optical sensing.
Keywords: Optical sensor; ring resonator; whispering gallery modes Optical sensor; ring resonator; whispering gallery modes
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Tan, W.; Shi, L.; Chen, X. Modeling of an Optical Sensor Based on Whispering Gallery Modes (WGMs) on the Surface Guiding Layer of Glass Filaments. Sensors 2008, 8, 6761-6768.

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