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Porous silicon sensors: From on-chip to mobile diagnostics
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Paper Abstract

Porous silicon (PSi) has been recognized as an advantageous material for use in optical biosensors due to its large internal surface area, ability to form multilayer optical structures, and compatibility with standard silicon lithographic techniques. We demonstrate an order of magnitude improvement in small molecule detection sensitivity for on-chip PSi ring resonators and photonic crystal nanobeams compared to the same structures fabricated on silicon-on-insulator wafers. Moreover, we demonstrate that PSi optical structures can be exploited for mobile diagnostics by using a smartphone with no additional functional accessories to detect color changes in the PSi that result from molecule capture.

Paper Details

Date Published: 5 March 2019
PDF: 9 pages
Proc. SPIE 10891, Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XVI, 1089112 (5 March 2019); doi: 10.1117/12.2508685
Show Author Affiliations
Tengfei Cao, Vanderbilt Univ. (United States)
Caitlin Carfano, The George Washington Univ. (United States)
Gilberto A. Rodriguez, Vanderbilt Univ. (United States)
Moinul H. Choudhury, Vanderbilt Univ. (United States)
Daffodil International Univ. (Bangladesh)
Francis O. Afzal, Vanderbilt Univ. (United States)
Sharon M. Weiss, Vanderbilt Univ. (United States)

Published in SPIE Proceedings Vol. 10891:
Nanoscale Imaging, Sensing, and Actuation for Biomedical Applications XVI
Dan V. Nicolau; Dror Fixler; Ewa M. Goldys, Editor(s)

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