Suspended photonic crystal slabs for biosensing

Mohamed El Beheiry; Victor Liu; Shanhui Fan; Ofer Levi

doi:10.1117/12.842945

4 March 2010 Suspended photonic crystal slabs for biosensing

Mohamed El Beheiry, Victor Liu, Shanhui Fan, Ofer Levi

Proceedings Volume 7553, Frontiers in Pathogen Detection: From Nanosensors to Systems; 75530R (2010) https://doi.org/10.1117/12.842945
Event: SPIE BiOS, 2010, San Francisco, California, United States

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.

Citation Download Citation

Mohamed El Beheiry, Victor Liu, Shanhui Fan, and Ofer Levi "Suspended photonic crystal slabs for biosensing", Proc. SPIE 7553, Frontiers in Pathogen Detection: From Nanosensors to Systems, 75530R (4 March 2010); https://doi.org/10.1117/12.842945

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