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

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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

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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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