Active-Thermal-Tunable Terahertz Absorber with Temperature-Sensitive Material Thin Film

被引：6

作者：

Zhao Zhang ^{[1
]}

Zhen Tian ^{[1
]}

Chao Chang ^{[2
]}

Xueguang Wang ^{[3
]}

Xueqian Zhang ^{[1
]}

Chunmei Ouyang ^{[1
]}

Jianqiang Gu ^{[1
]}

Jiaguang Han ^{[1
]}

Weili Zhang ^{[1
,4
]}

机构：

[1] Center for Terahertz Waves, College of Precision Instrument and Optoelectronics Engineering, and Key Laboratory of Opto-Electronics Information and Technology(Ministry of Education),Tianjin University

[2] Key Laboratory of Physical Electronics and Devices of the Ministry of Education, Xi'an Jiaotong University

[3] Hebei University of Engineering

[4] School of Electrical and Computer Engineering, Oklahoma State University

来源：

Nanotechnology and Precision Engineering | 2018年 / 1卷 / 02期

基金：

美国国家科学基金会;

关键词：

Terahertz wave; Absorber; Thin film; InSb;

D O I：

10.13494/j.npe.20180008

中图分类号：

TB383.2 [];

学科分类号：

070205 ; 080501 ; 1406 ;

摘要：

It is shown that active-tunable terahertz absorbers can be realized in a sandwich-structured system comprising an ultrathin dielectric film(polyimide) on a temperature-sensitive substrate(InSb) with a metal film on the back by utilizing the intrinsic carrier density(N) variation in InSb. When increasing the temperature from 250 to 320 K, N in InSb varied from ～5.50×1015 to ～2.98×1016 cm–3. Fixing the thickness of dielectric film with the value of 1.37 μm, the absorption peak shifted from 1.41 to 3.29 THz while keeping absorption higher than 99%. This active tunability can respond to even a slight temperature perturbation, and shows polarization insensitivity as well as high tolerance of incidence-angle(absorption peak can still exceed 90% even the incidence angle reaches 60°). Besides, the refractive index of polyimide(PI) has thermal stability at the terahertz range and the merit of good workability. These characteristics guarantee the stability of activetunable performance. The peculiarities and innovations of this proposal promise a wide range of high efficiency terahertz devices, such as thermal sensors, spatial light modulators(SLMs) and so on.

引用

页码：123 / 128

页数：6

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