Tunable terahertz absorber based on transparent and flexible metamaterial

被引：35
|
作者：
Xiao, Junyu [1 ,2 ]
Xiao, Ruiwen [1 ,2 ]
Zhang, Rongxuan [1 ,2 ]
Shen, Zhixiong [3 ,4 ]
Hu, Wei [3 ,4 ]
Wang, Lei [1 ,2 ,3 ,4 ]
Lu, Yanqing [3 ,4 ]
机构：
[1] Nanjing Univ Posts & Telecommun, Coll Elect & Opt Engn, Nanjing 210023, Peoples R China
[2] Nanjing Univ Posts & Telecommun, Coll Microelect, Nanjing 210023, Peoples R China
[3] Nanjing Univ, Natl Lab Solid State Microstruct, Key Lab Intelligent Opt Sensing & Manipulat, Nanjing 210093, Peoples R China
[4] Nanjing Univ, Coll Engn & Appl Sci, Nanjing 210093, Peoples R China
来源：
CHINESE OPTICS LETTERS | 2020年 / 18卷 / 09期
基金：
中国国家自然科学基金; 中国博士后科学基金;
关键词：
tunable terahertz absorber; transparent metamaterial; flexible metamaterial;
D O I：
10.3788/COL202018.092403
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We demonstrate a tunable terahertz (THz) absorber based on an indium tin oxide (ITO) metamaterial. The upper ITO cross-shaped metasurface with different arm lengths is fabricated by direct femtosecond laser etching. The thicknem of the middle dielectric layer is only 60 pm, which makes the absorber very transparent and flexible. The experimental results show that the THz resonant peaks have a high performance near 1 THz. By setting spacers of different thicknesses between the middle layer and the ITO mirror, a new type of tunable THz absorber is proposed. Its absorption peak frequency can be continuously adjusted from 0.92 to 1.04 THz between TE and TM polarization. This transparent THz metamaterial absorber is expected to be widely used in THz imaging, sensing, and biological detection.
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页数：5
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