Magnetically tunable metasurface comprising InAs and InSb pixels for absorbing terahertz radiation

被引：29

作者：

Sharma, Govindam ^{[1
]}

Lakhtakia, Akhlesh ^{[2
]}

Bhattacharyya, Somak ^{[3
]}

Jain, Pradip K. ^{[1
,3
]}

机构：

[1] Natl Inst Technol Patna, Dept Elect & Commun Engn, Patna 800005, Bihar, India

[2] Penn State Univ, Dept Engn Sci & Mech, NanoMM Nanoengn Metamat Grp, University Pk, PA 16802 USA

[3] Indian Inst Technol BHU, Dept Elect Engn, Varanasi 221005, Uttar Pradesh, India

来源：

APPLIED OPTICS | 2020年 / 59卷 / 31期

关键词：

POLARIZATION; METAMATERIALS; SPECTROSCOPY; PERFECT; DENSITY;

D O I：

10.1364/AO.405023

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

A magnetically tunable metasurface comprising meta-atoms with InSb-patched, InAs-patched, and unpatched pixels was simulated using commercial software to maximize the absorption of normally incident radiation in the terahertz spectral regime, with the patches decorating the illuminated face of a gold-backed polyimide substrate. Maximum absorptance of 0.99 and minimum absorptance of 0.95 can be obtained in 0.14-0.23-THz-wide bands in the 2-4-THz spectral regime, with an average tuning rate of 0.3 THz T-1 and 0.24-THz dynamic range when the controlling magnetostatic field is aligned parallel to the incident electric field. The use of both InSb and InAs patches is much superior to the use of patches of only one of those materials. The design can be adapted for neighboring spectral regimes by exploiting the scale invariance of the Maxwell equations. (C) 2020 Optical Society of America

引用

页码：9673 / 9680

页数：8