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Optics Letters

Optics Letters


  • 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)

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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

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)

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  17. The droplet size of the glycerol–water mixture is several orders of magnitude larger than the holes in the photonic crystal, with a typical thickness of a few hundred micrometers and a coverage area of 5mm 2. Therefore the holes should still be fully filled even after the evaporation of water, except with a higher concentration of glycerol.
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  19. Glycerol is highly hygroscopic, which limits the final water content to 15%.

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