Highly-sensitive passive integrated optical spiral-shaped waveguide refractometer

A passive integrated optical waveguide refractometer based on bendloss changes in a spiral-shaped channel waveguide is proposed and fabricated in Si3N4/SiO2 technology. The experimentally determined performance and the theoretical predictions, based on a simple model for so-called “whispering galler...

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Bibliographic Details
Published in:Applied physics letters 1997-11, Vol.71 (20), p.2895-2897
Main Authors: Veldhuis, G. J., Lambeck, P. V.
Format: Article
Language:English
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Summary:A passive integrated optical waveguide refractometer based on bendloss changes in a spiral-shaped channel waveguide is proposed and fabricated in Si3N4/SiO2 technology. The experimentally determined performance and the theoretical predictions, based on a simple model for so-called “whispering gallery modes,” agree very well. The minimum detectable refractive index change was measured to be Δn=1.3×10−5.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.120208