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

被引:11
作者
Deng, Guangsheng [1 ]
Lu, Yujiao [1 ]
Yin, Zhiping [1 ]
Lai, Weien [1 ]
Lu, Hongbo [1 ]
Yang, Jun [1 ]
Yang, Aifeng [2 ]
Ye, Yang [3 ]
Liu, Dayong [3 ]
Chi, Baihong [3 ]
机构
[1] Hefei Univ Technol, Acad Photoelect Technol, Natl Key Lab Adv Display Technol, Hefei 230009, Anhui, Peoples R China
[2] Hefei Univ Technol, Sch Management, Hefei 230009, Anhui, Peoples R China
[3] Space Star Technol Co Ltd, Proc & Mech Engn Technol Lab, Beijing 100095, Peoples R China
来源
ELECTRONICS | 2018年 / 7卷 / 03期
基金
中国国家自然科学基金;
关键词
metamaterials; liquid-crystal devices; polarization-selective devices; WIDE-BAND;
D O I
10.3390/electronics7030027
中图分类号
TP [自动化技术、计算机技术];
学科分类号
0812 ;
摘要
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.
引用
收藏
页数:10
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