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http://hdl.handle.net/2440/124775
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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 2156-3446 |
Statement of Responsibility: | 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. |
RMID: | 1000018116 |
DOI: | 10.1109/TTHZ.2020.2964812 |
Grant ID: | http://purl.org/au-research/grants/arc/DP170101922 |
Appears in Collections: | Physics publications |
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