Trapping waves with tunable prism-coupling terahertz metasurfaces absorber

被引：15
作者：
Huang, Yi [1 ]
Zhong, Shuncong [1 ,2 ]
Shi, Tingting [1 ]
Shen, Yao-Chun [3 ]
Cui, Daxiang [4 ]
机构：
[1] Fuzhou Univ, Sch Mech Engn & Automat, Lab Opt Terahertz & Nondestruct Testing, Fuzhou 350108, Fujian, Peoples R China
[2] Shanghai Univ, Sch Mechatron Engn & Automat, Dept Precis Mech Engn, Shanghai 200072, Peoples R China
[3] Univ Liverpool, Dept Elect Engn & Elect, Liverpool L69 3BX, Merseyside, England
[4] Shanghai Jiao Tong Univ, Dept Bionano Sci & Engn, Shanghai 200030, Peoples R China
来源：
OPTICS EXPRESS | 2019年 / 27卷 / 18期
基金：
中国国家自然科学基金;
关键词：
METAMATERIAL ABSORBER; LABEL-FREE; SPECTROSCOPY;
D O I：
10.1364/OE.27.025647
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We experimentally demonstrated a corrugated metallic metasurface based tunable perfect absorber for terahertz (THz) frequencies in a total internal reflection geometry. The absorbance is strongly depend on the central layer of this three-layer absorber, which provides a feasible approach to tune the absorption. In particular, there exist an optimal gap that enables a perfect absorption at specific frequency. Due to the simple 1D geometric structure of metasurface, its absorption frequency can be easily tailored over a wide frequency range (0.625-1.499 THz). More importantly, the modulation of the effective refractive index and loss of medium environment can be accepted as an alternative approach for the absorption properties modulation. This prism coupling absorber provides a new route for modulation of the absorption characteristics with potential applications in biological sensing. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
引用
收藏
页码：25647 / 25655
页数：9
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