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Open AccessCommunication

Liquid Crystal Tunable Dielectric Metamaterial Absorber in the Terahertz Range

by Shenghang Zhou 1, Zhixiong Shen 1,2, Ruiyun Kang 3, Shijun Ge 1,2,* and Wei Hu 1,2,*
1
Key Laboratory of Intelligent Optical Sensing and Manipulation, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China
2
Institute for Smart Liquid Crystals, JITRI, Changshu 215500, China
3
Beijing New Oriental Foreign Language School at Yangzhou, Yangzhou 225006, China
*
Authors to whom correspondence should be addressed.
Appl. Sci. 2018, 8(11), 2211; https://doi.org/10.3390/app8112211
Received: 30 October 2018 / Revised: 7 November 2018 / Accepted: 8 November 2018 / Published: 10 November 2018
(This article belongs to the Special Issue Liquid Crystal THz Photonics: Materials, Devices and Applications)
In this paper, we propose a tunable dielectric metamaterial absorber in the terahertz (THz) range. The absorber is composed of a silicon pillar array embedded in a liquid crystal (LC) layer, which is sandwiched by two graphene electrodes. By way of varying the applied bias, the LC orientation can be continuously tuned. At a saturated bias, all LCs are vertically driven, and an absorption peak of 0.86 is achieved at 0.79 THz. When the bias is turned off, the same LCs are horizontally aligned, and the absorption peak degenerates into two smaller ones. A 47% modulation depth at 0.79 THz is obtained via numerical simulation with experimental feasibility considered. Such an active THz dielectric absorber may be utilized as part of various active THz apparatuses in THz imaging, sensing, switching, and filtering. View Full-Text
Keywords: dielectric absorber; liquid crystal; metamaterial; tunable; terahertz dielectric absorber; liquid crystal; metamaterial; tunable; terahertz
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MDPI and ACS Style

Zhou, S.; Shen, Z.; Kang, R.; Ge, S.; Hu, W. Liquid Crystal Tunable Dielectric Metamaterial Absorber in the Terahertz Range. Appl. Sci. 2018, 8, 2211.

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