Solid analyte and aqueous solutions sensing based on a flexible terahertz dual-band metamaterial absorber

Xin Yan; Lan-Ju Liang; Xin Ding; Jian-Quan Yao

doi:10.1117/1.OE.56.2.027104

11 February 2017 Solid analyte and aqueous solutions sensing based on a flexible terahertz dual-band metamaterial absorber

Xin Yan, Lan-Ju Liang, Xin Ding, Jian-Quan Yao

Author Affiliations +

Funded by: National Natural Science Foundation of China (NSFC), Natural Science Foundation of China, Postdoctoral Science Foundation, Programe of independent innovation achievement transformation plan for Zaozhuang, Science and Technology Program of Zaozhuang

Optical Engineering, Vol. 56, Issue 2, 027104 (February 2017). https://doi.org/10.1117/1.OE.56.2.027104

Abstract

A high-sensitivity sensing technique was demonstrated based on a flexible terahertz dual-band metamaterial absorber. The absorber has two perfect absorption peaks, one with a fundamental resonance ( f 1 ) of the structure and another with a high-order resonance ( f 2 ) originating from the interactions of adjacent unit cells. The quality factor ( Q ) and figure of merit of f 2 are 6 and 14 times larger than that of f 1 , respectively. For the solid analyte, the changes in resonance frequency are monitored upon variation of analyte thickness and index; a linear relation between the amplitude absorption with the analyte thickness is achieved for f 2 . The sensitivity ( S ) is 31.2% refractive index units ( RIU − 1 ) for f 2 and 13.7% RIU − 1 for f 1 . For the aqueous solutions, the amplitude of absorption decreases linearly with increasing the dielectric constant for the ethanol–water mixture of f 1

CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Xin Yan, Lan-Ju Liang, Xin Ding, and Jian-Quan Yao "Solid analyte and aqueous solutions sensing based on a flexible terahertz dual-band metamaterial absorber," Optical Engineering 56(2), 027104 (11 February 2017). https://doi.org/10.1117/1.OE.56.2.027104

Received: 21 November 2016; Accepted: 20 January 2017; Published: 11 February 2017

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