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Proceedings Paper

Chiral sculptured thin films as integrated dual-modality optical sensors
Author(s): Tom G. Mackay; Akhlesh Lakhtakia; Siti S. Jamaian
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Paper Abstract

Chiral sculptured thin films (CSTFs) are well-suited to optical-sensing applications because their multiscale porosity and optical properties can be tailored to order. Two independent modalities of optical sensing were considered. For both modalities, the analytes to be sensed are assumed to fully penetrate the void regions of the CSTF and thereby give rise to measurable changes in the macroscopic optical responses of the CSTF. The first modality is based on the excitation of multiple surface-plasmon-polariton (SPP) waves at the planar interface of a CSTF and a metal film, while the second is based on the spectral shift in the circular Bragg phenomenon (CBP). We considered a CSTF with a central twist defect of 90°. Our numerical studies revealed a CSTF coated with a thin layer of metal of appropriate thickness can simultaneously support the excitation of multiple SPP waves and the CBP, with both phenomenons being independently sensitive to the refractive index of a fluid which infiltrates the void regions of the CSTF. Accordingly, an integrated dual-modality optical sensor may be envisaged which harnesses both modalities of sensing simultaneously. Such an optical sensor offers the potential to detect more than one type of analyte at a time, with increased sensitivities and/or specificities.

Paper Details

Date Published: 17 October 2012
PDF: 14 pages
Proc. SPIE 8465, Nanostructured Thin Films V, 84650X (17 October 2012); doi: 10.1117/12.928981
Show Author Affiliations
Tom G. Mackay, The Univ. of Edinburgh (United Kingdom)
The Pennsylvania State Univ. (United States)
Akhlesh Lakhtakia, The Pennsylvania State Univ. (United States)
Siti S. Jamaian, The Univ. of Edinburgh (United Kingdom)
Univ. Tun Hussein Onn (Malaysia)

Published in SPIE Proceedings Vol. 8465:
Nanostructured Thin Films V
Tom G. Mackay; Yi-Jun Jen; Raúl J. Martín-Palma, Editor(s)

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