S-shaped SU-8 optical waveguide immobilized with gold nanoparticles for trace detection of explosives

Reshma Bharadwaj; Rakesh Tripathi; Amit Prabhakar; Soumyo Mukherji

doi:10.1117/12.2034195

15 October 2013 S-shaped SU-8 optical waveguide immobilized with gold nanoparticles for trace detection of explosives

Reshma Bharadwaj, Rakesh Tripathi, Amit Prabhakar, Soumyo Mukherji

Proceedings Volume 8924, Fourth Asia Pacific Optical Sensors Conference; 892424 (2013) https://doi.org/10.1117/12.2034195
Event: Asia Pacific Optical Sensors Conference 2013, 2013, Wuhan, China

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.

Citation Download Citation

Reshma Bharadwaj, Rakesh Tripathi, Amit Prabhakar, and Soumyo Mukherji "S-shaped SU-8 optical waveguide immobilized with gold nanoparticles for trace detection of explosives", Proc. SPIE 8924, Fourth Asia Pacific Optical Sensors Conference, 892424 (15 October 2013); https://doi.org/10.1117/12.2034195

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