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Optical Engineering • Open Access

Solid analyte and aqueous solutions sensing based on a flexible terahertz dual-band metamaterial absorber
Author(s): Xin Yan; Lan-Ju Liang; Xin Ding; Jian-Quan Yao

Paper 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

Paper Details

Date Published: 11 February 2017
PDF: 6 pages
Opt. Eng. 56(2) 027104 doi: 10.1117/1.OE.56.2.027104
Published in: Optical Engineering Volume 56, Issue 2
Show Author Affiliations
Xin Yan, Tianjin Univ. (China)
Zaozhuang Univ. (China)
Lan-Ju Liang, Tianjin Univ. (China)
Zaozhuang Univ. (China)
Xin Ding, Tianjin Univ. (China)
Jian-Quan Yao, Tianjin Univ. (China)

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