Liquid Crystal Tunable Dielectric Metamaterial Absorber in the Terahertz Range

被引:34
|
作者
Zhou, Shenghang [1 ]
Shen, Zhixiong [1 ,2 ]
Kang, Ruiyun [3 ]
Ge, Shijun [1 ,2 ]
Hu, Wei [1 ,2 ]
机构
[1] Nanjing Univ, Coll Engn & Appl Sci, Key Lab Intelligent Opt Sensing & Manipulat, Nanjing 210093, Jiangsu, Peoples R China
[2] JITRI, Inst Smart Liquid Crystals, Changshu 215500, Jiangsu, Peoples R China
[3] Beijing New Oriental Foreign Language Sch Yangzho, Yangzhou 225006, Jiangsu, Peoples R China
来源
APPLIED SCIENCES-BASEL | 2018年 / 8卷 / 11期
基金
中国国家自然科学基金;
关键词
dielectric absorber; liquid crystal; metamaterial; tunable; terahertz; BIREFRINGENCE; METASURFACE; FREQUENCY; DESIGN;
D O I
10.3390/app8112211
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
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.
引用
收藏
页数:7
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