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Proceedings Paper

Simulation study and experimental confirmation of a tunable terahertz negative-refractive index metamaterial
Author(s): Han-hsiang Chen; Yen-Tse Cheng; Chi-leung Tsui; Wei-Chih Wang
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Paper Abstract

Design and fabrication of a tunable fishnet metamaterial for potential THz beam steering device is presented. Split ring resonators have been the most popular unit-cell geometry for THz metamaterials. However, we have adopted the fishnet geometry for the application and utilizing polymer disperse liquid crystal (PDLC) as the tunable substrate. One of the advantages of using PDLC over conventional liquid crystal is the elimination of a cell to confine and encapsulate the liquid crystals. The trade-off of PDLC versus conventional liquid crystal performance is that a higher voltage is required to turn the PDLC on (approximately 2-10V/micron) as opposed to the conventional liquid crystal (1-5V/micron). In this report, we will present our latest development in the PDLC and its application in a tunable gradient fishnet metamaterial (TGFMM) array. The objective is to achieve a high Q and broader tunability of resonant frequency while maintaining a low operating voltage. We will present the latest simulation and experiment results of a polarization independent rotated square fishnet metamaterial design.

Paper Details

Date Published: 2 March 2020
PDF: 7 pages
Proc. SPIE 11279, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XIII, 112791Q (2 March 2020); doi: 10.1117/12.2545470
Show Author Affiliations
Han-hsiang Chen, National Tsing Hua Univ. (Taiwan)
Yen-Tse Cheng, National Tsing Hua Univ. (Taiwan)
Chi-leung Tsui, Univ. of Washington (United States)
Wei-Chih Wang, National Tsing Hua Univ. (Taiwan)
Univ. of Washington (United States)

Published in SPIE Proceedings Vol. 11279:
Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XIII
Laurence P. Sadwick; Tianxin Yang, Editor(s)

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