Sensing of refractive index based on mode interference in a five-layer slab waveguide

We propose a refractive index sensor based on the mode interference in a five-layer waveguide. The propagation properties are analyzed by the coupled mode theory, and the function of the waveguide as a refractive index sensor is also explored based on simulation results. Taking into consideration a...

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Bibliographic Details
Published in:Optics communications 2015-01, Vol.334, p.294-297
Main Authors: Tang, Tingting, Ma, Wenying, Liu, Wenli, He, Xiujun
Format: Article
Language:English
Subjects:
Mode interference
Refractive index sensor
Sensing resolution
Sensitivity
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Summary:We propose a refractive index sensor based on the mode interference in a five-layer waveguide. The propagation properties are analyzed by the coupled mode theory, and the function of the waveguide as a refractive index sensor is also explored based on simulation results. Taking into consideration a trade-off between the sensitivity and the size of the proposed sensor, we can get a very compact device of 10.8μm×1μm, and the sensing resolution of the proposed refractive index can reach 2.25×10−5RIU for index change at around 1.455.
ISSN:0030-4018
1873-0310
DOI:10.1016/j.optcom.2014.08.021