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Proceedings Paper

Porous silicon waveguide with integrated grating coupler for DNA sensing
Author(s): Xing Wei; Christopher Kang; Guoguang Rong; Scott T. Retterer; Sharon M. Weiss
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Paper Abstract

A porous silicon waveguide with integrated grating coupler is demonstrated as a new platform for portable detection of chemical and biological molecules. The two-layer porous silicon waveguide is formed by electrochemical etching and a photoresist grating is fabricated directly on the waveguide core by means of electron beam lithography. Angle-resolved reflectance measurements reveal distinct peaks corresponding to the guided mode. A 0.420° reflectance shift was observed upon 16-base DNA hybridization, which was more than a factor of 5 larger than the observed reflectance shift after exposure to a mismatched DNA sequence.

Paper Details

Date Published: 19 February 2009
PDF: 7 pages
Proc. SPIE 7167, Frontiers in Pathogen Detection: From Nanosensors to Systems, 71670C (19 February 2009);
Show Author Affiliations
Xing Wei, Vanderbilt Univ. (United States)
Christopher Kang, Vanderbilt Univ. (United States)
Guoguang Rong, Vanderbilt Univ. (United States)
Scott T. Retterer, Oak Ridge National Lab. (United States)
Sharon M. Weiss, Vanderbilt Univ. (United States)

Published in SPIE Proceedings Vol. 7167:
Frontiers in Pathogen Detection: From Nanosensors to Systems
Philippe M. Fauchet, Editor(s)

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