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Proceedings Paper

Refractive index sensor with a guided-mode resonant grating filter
Author(s): Hisao Kikuta; Naoya Maegawa; Akio Mizutani; Koichi Iwata; Hiroshi Toyota
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Paper Abstract

This paper describes a novel refractive index sensor with a guided-mode resonant grating (GMRG) filter. The GMRG filter is a narrowband wavelength reflection filter. The incident light is reflected at a resonance condition of incident angle and wavelength. When the grating filter is covered by a liquid to be tested, the resonant condition depends upon its refractive index. The refractive index of the liquid can be determined from the resonance angle for a known wavelength. Since a full-half width of incident angle for the resonance is very narrow (less than 0.1 degree(s)), a high resolution is expected. We designed the GMRG filters for the refractive index sensor. And the resonance angle of incidence was investigated experimentally for the mixture of water and ethyl alcohol.

Paper Details

Date Published: 8 May 2001
PDF: 4 pages
Proc. SPIE 4416, Optical Engineering for Sensing and Nanotechnology (ICOSN 2001), (8 May 2001); doi: 10.1117/12.427053
Show Author Affiliations
Hisao Kikuta, Osaka Prefecture Univ. (Japan)
Naoya Maegawa, Osaka Prefecture Univ. (Japan)
Akio Mizutani, Osaka Prefecture Univ. (Japan)
Koichi Iwata, Osaka Prefecture Univ. (Japan)
Hiroshi Toyota, Osaka Science and Technology Ctr. (Japan)

Published in SPIE Proceedings Vol. 4416:
Optical Engineering for Sensing and Nanotechnology (ICOSN 2001)
Koichi Iwata, Editor(s)

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