Enhancement of diffraction-based biosensing using porous structures and electromagnetic surface states

J. E. Sipe; J. D. Ryckman; S. M. Weiss; M. Liscidini

doi:10.1117/12.842431

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25 February 2010 Enhancement of diffraction-based biosensing using porous structures and electromagnetic surface states

J. E. Sipe, J. D. Ryckman, S. M. Weiss, M. Liscidini

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Proceedings Volume 7553, Frontiers in Pathogen Detection: From Nanosensors to Systems; 75530M (2010) https://doi.org/10.1117/12.842431
Event: SPIE BiOS, 2010, San Francisco, California, United States

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.

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J. E. Sipe, J. D. Ryckman, S. M. Weiss, and M. Liscidini "Enhancement of diffraction-based biosensing using porous structures and electromagnetic surface states", Proc. SPIE 7553, Frontiers in Pathogen Detection: From Nanosensors to Systems, 75530M (25 February 2010); https://doi.org/10.1117/12.842431

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