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Proceedings Paper

Molecular detection with terahertz waves based on absorption-induced transparency metamaterials
Author(s): Sergio G. Rodrigo; L. Martín-Moreno
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Paper Abstract

A system for the detection of spectral signatures of chemical compounds at the Terahertz regime is presented. The system consists on a holey metal film whereby the presence of a given substance provokes the appearance of spectral features in transmission and reflection induced by the molecular specimen. These induced effects can be regarded as an extraordinary optical transmission phenomenon called absorption-induced transparency (AIT). The phenomenon consist precisely in the appearance of peaks in transmission and dips in reflection after sputtering of a chemical compound onto an initially opaque holey metal film. The spectral signatures due to AIT occur unexpectedly close to the absorption energies of the molecules. The presence of a target, a chemical compound, would be thus revealed as a strong drop in reflectivity measurements. We theoretically predict the AIT based system would serve to detect amounts of hydrocyanic acid (HCN) at low rate concentrations.

Paper Details

Date Published: 21 October 2016
PDF: 5 pages
Proc. SPIE 9993, Millimetre Wave and Terahertz Sensors and Technology IX, 99930C (21 October 2016); doi: 10.1117/12.2241385
Show Author Affiliations
Sergio G. Rodrigo, Centro Univ. de la Defensa Zaragoza (Spain)
Univ. de Zaragoza, CSIC (Spain)
L. Martín-Moreno, Univ. de Zaragoza, CSIC (Spain)

Published in SPIE Proceedings Vol. 9993:
Millimetre Wave and Terahertz Sensors and Technology IX
Neil A. Salmon; Sherif Sayed Ahmed, Editor(s)

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