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Type: Journal article
Title: High-Q terahertz absorber with stable angular response
Author: Ebrahimi, A.
Ako, R.
Lee, W.
Bhaskaran, M.
Sriram, S.
Withayachumnankul, W.
Citation: IEEE Transactions on Terahertz Science and Technology, 2020; 10(2):204-211
Publisher: IEEE
Issue Date: 2020
ISSN: 2156-342X
Statement of
Amir Ebrahimi, Rajour Tanyi Ako, Wendy S. L. Lee, Madhu Bhaskaran, Sharath Sriram, Withawat Withayachumnankul
Abstract: This article presents a narrow-band terahertz absorber using miniaturized unit cells. The absorber is made of three metallic layers separated from each other using low-loss cyclic olefin copolymer as dielectric spacers. A high quality factor ( Q ) is obtained using a first-order resonating structure with additional capacitive loading formed by the top two metallic layers. A circuit model is developed for the analysis and design of the proposed absorber. The designed absorber shows 1% fractional bandwidth for more than 90% absorption around a center frequency of 0.5 THz under normal incidence angle. This is equivalent to a quality factor of Q=31 , calculated at 50% absorbance. The structure shows a highly stable absorbance over a wide range of oblique incidence angles. The designed absorber has been fabricated using a microfabrication process. The measured results of the fabricated prototype are in good agreement with the simulations.
Keywords: Circuit analog absorbers; miniaturized elements; narrow-band absorber; terahertz absorber
Rights: © 2020, IEEE.
DOI: 10.1109/TTHZ.2020.2964812
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