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Electronics 2018, 7(3), 27;

A Tunable Polarization-Dependent Terahertz Metamaterial Absorber Based on Liquid Crystal

National Key Laboratory of Advanced Display Technology, Academy of Photoelectric Technology, Hefei University of Technology, Hefei 230009, China
School of Management, Hefei University of Technology, Hefei 230009, China
Process and Mechanical Engineering Technology Laboratory, Space Star Technology Co. Ltd., Beijing 100095, China
Author to whom correspondence should be addressed.
Received: 19 January 2018 / Revised: 10 February 2018 / Accepted: 23 February 2018 / Published: 26 February 2018
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In this paper, a tunable polarization-dependent terahertz (THz) metamaterial absorber based on liquid crystal (LC) is presented. The measurement results show that absorption peak is at 239.5 GHz for a TE-polarized wave and 306.6 GHz for a TM-polarized wave, without exerting the bias voltage on the LC layer. An increase in bias voltage affects the orientation of LC molecules and causes redshifted resonant frequencies. By adjusting the bias voltage from 0 to 10 V, frequency tunabilities of 4.7% and 4.1% for TE- and TM-polarized waves, respectively, were experimentally demonstrated. Surface current and power loss distribution was analyzed to explain the physical mechanism of the absorber, while the absorption dependence on geometrical parameters and incident angles was also studied in detail. According to the obtained results, the proposed absorber is shown here to be capable of achieving tunable polarization-dependent absorption, and to have potential application in terahertz polarization imaging, terahertz sensing, and polarization multiplexing. View Full-Text
Keywords: metamaterials; liquid-crystal devices; polarization-selective devices metamaterials; liquid-crystal devices; polarization-selective devices

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Deng, G.; Lu, Y.; Yin, Z.; Lai, W.; Lu, H.; Yang, J.; Yang, A.; Ye, Y.; Liu, D.; Chi, B. A Tunable Polarization-Dependent Terahertz Metamaterial Absorber Based on Liquid Crystal. Electronics 2018, 7, 27.

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