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Proceedings Paper

Suspended photonic crystal slabs for biosensing
Author(s): Mohamed El Beheiry; Victor Liu; Shanhui Fan; Ofer Levi
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Paper Abstract

Label-free optical biosensors based on photonic crystal slabs offer high sensitivity and simplified coupling to incoming free-space radiation. Biosensing results from detecting shifts in guided resonance frequency spectral location based on changes in index of refraction due to analytes binding at the PC slab surface. We have evaluated biosensing for a PC slab suspended above a substrate, and compared it to a case where the PC slab lies directly on a substrate. Differences in guided resonance quality factors (Q) were largely invariable for slab-on-substrate and suspended PC slab designs. However, we show that index of refraction sensitivity in a suspended PC slab can be enhanced nearly three-fold over the slab-on-substrate design.

Paper Details

Date Published: 4 March 2010
PDF: 6 pages
Proc. SPIE 7553, Frontiers in Pathogen Detection: From Nanosensors to Systems, 75530R (4 March 2010); doi: 10.1117/12.842945
Show Author Affiliations
Mohamed El Beheiry, Univ. of Toronto (Canada)
Victor Liu, Stanford Univ. (United States)
Shanhui Fan, Stanford Univ. (United States)
Ofer Levi, Univ. of Toronto (Canada)

Published in SPIE Proceedings Vol. 7553:
Frontiers in Pathogen Detection: From Nanosensors to Systems
Philippe M. Fauchet; Benjamin L. Miller, Editor(s)

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