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Guided-Wave Optical Biosensors
Sensors 2007, 7(5), 689-696; doi:10.3390/s7050689

Simulation of Optical Microfiber Loop Resonators for Ambient Refractive Index Sensing

, ,  and *
Department of Physics, the State Key Laboratory on Fiber Optic Local Area Communication Networks and Advanced Optical Communication Systems, Shanghai Jiao Tong University, Shanghai 200240, China
* Author to whom correspondence should be addressed.
Received: 4 April 2007 / Accepted: 3 May 2007 / Published: 24 May 2007
(This article belongs to the Special Issue Optical Biosensors)
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Based on theoretical modeling and optimization, we exploit the application ofoptical microfiber loop resonators in ambient refractive index sensing. We set up a reliabletheoretical model and optimize the structural parameters of microfiber loop resonatorsincluding the radius of the microrfiber, the radius of the loop and the length of the couplingregion for higher sensitivity, wider dynamic measurement range, and lower detection limit.To show the convincible and realizable sensing ability we perform the simulation ofsensing an extreme small variation of ambient refractive index by employing a set ofexperimental data as the parameters in the expression of intensity transmission coefficient,and the detection limit reaches to a variation of ambient refractive index of 10-5 refractiveindex unit (RIU). This has superiority over the existing evanescent field-basedsubwavelength-diameter optical fiber refractive index sensor.
Keywords: Fiber optics sensors; Optical resonators; Subwavelength-diameter optical fibers. Fiber optics sensors; Optical resonators; Subwavelength-diameter optical fibers.
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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Shi, L.; Xu, Y.; Tan, W.; Chen, X. Simulation of Optical Microfiber Loop Resonators for Ambient Refractive Index Sensing. Sensors 2007, 7, 689-696.

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