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Proceedings Paper

S-shaped SU-8 optical waveguide immobilized with gold nanoparticles for trace detection of explosives
Author(s): Reshma Bharadwaj; Rakesh Tripathi; Amit Prabhakar; Soumyo Mukherji
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Paper Abstract

In this study, we report a miniaturized optical sensor for direct detection of vapors of nitro-based explosives using gold nanoparticle (AuNP) coated SU-8 polymer optical waveguides. S-shaped waveguide geometry was chosen due its enhanced evanescent field sensitivity. Light was coupled into the waveguide structure to evanescently excite the localized surface plasmon resonance (LSPR) modes of the immobilized AuNP. The AuNP were functionalized with 4- mercaptobenzoic acid (4-MBA) which acts as the receptor for nitro-based explosives. The AuNP coated SU-8 optical waveguide sensor demonstrated an ability to detect 10 parts per billion (ppb) concentration of explosive analytes.

Paper Details

Date Published: 15 October 2013
PDF: 4 pages
Proc. SPIE 8924, Fourth Asia Pacific Optical Sensors Conference, 892424 (15 October 2013); doi: 10.1117/12.2034195
Show Author Affiliations
Reshma Bharadwaj, Indian Institute of Technology Bombay (India)
Rakesh Tripathi, Indian Institute of Technology Bombay (India)
Amit Prabhakar, Indian Institute of Technology Bombay (India)
Soumyo Mukherji, Indian Institute of Technology Bombay (India)

Published in SPIE Proceedings Vol. 8924:
Fourth Asia Pacific Optical Sensors Conference
Minghong Yang; Dongning Wang; Yun-Jiang Rao, Editor(s)

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