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Proceedings Paper

Enhancement of diffraction-based biosensing using porous structures and electromagnetic surface states
Author(s): J. E. Sipe; J. D. Ryckman; S. M. Weiss; M. Liscidini
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Paper Abstract

Diffraction-based biosensors are often based on the adsorption of a target material on a grating made of thin layers, where the adsorption is detected by a modification of the diffracted signal. In this communication we discuss two strategies for enhancing this detection process. The first is based on the use of grating structures made of porous elements, where sensing is based on target molecules penetrating into the elements and modifying their effective index of refraction. The second is a resonant process where the effectiveness of the grating is enhanced by the coupling to surface electromagnetic states, in particular Bloch surface waves that exist at the interface between a homogeneous medium and a photonic crystal.

Paper Details

Date Published: 25 February 2010
PDF: 7 pages
Proc. SPIE 7553, Frontiers in Pathogen Detection: From Nanosensors to Systems, 75530M (25 February 2010); doi: 10.1117/12.842431
Show Author Affiliations
J. E. Sipe, Univ. of Toronto (Canada)
J. D. Ryckman, Vanderbilt Univ. (United States)
S. M. Weiss, Vanderbilt Univ. (United States)
M. Liscidini, Univ. degli Studi di Pavia (Italy)

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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