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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Vol. 29, Iss. 10 — May. 14, 2004
  • pp: 1093–1095

Ultracompact biochemical sensor built with two-dimensional photonic crystal microcavity

E. Chow, A. Grot, L. W. Mirkarimi, M. Sigalas, and G. Girolami  »View Author Affiliations


Optics Letters, Vol. 29, Issue 10, pp. 1093-1095 (2004)
http://dx.doi.org/10.1364/OL.29.001093


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Abstract

We report an experimental demonstration of an ultracompact biochemical sensor based on a two-dimensional photonic crystal microcavity. The microcavity, fabricated on a silicon-on-insulator substrate, is designed to have a resonant wavelength (λ) near 1.5 μm . The transmission spectrum of the sensor is measured with different ambient refractive indices ranging from n=1.0 to n=1.5 . From observation of the shift in resonant wavelength, a change in ambient refractive index of Δn=0.002 is readily apparent. The correspondence between absolute refractive index and resonant wavelength agrees with numerical calculation to within 4% accuracy. The evaporation of water in a 5% glycerol mixture is also used to demonstrate the capability for in situ time-resolved sensing.

© 2004 Optical Society of America

OCIS Codes
(130.6010) Integrated optics : Sensors
(230.5750) Optical devices : Resonators

Citation
E. Chow, A. Grot, L. W. Mirkarimi, M. Sigalas, and G. Girolami, "Ultracompact biochemical sensor built with two-dimensional photonic crystal microcavity," Opt. Lett. 29, 1093-1095 (2004)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-29-10-1093

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