Bidirectional and dynamically tunable THz absorber with Dirac semimetal

被引：71

作者：

Meng, Haiyu ^{[1
,2
]}

Shang, Xiongjun ^{[3
]}

Xue, Xiongxiong ^{[1
,2
]}

Tang, Kezheng ^{[1
,2
]}

Xia, Shengxuan ^{[1
,2
]}

Zhai, Xiang ^{[1
,2
]}

Liu, Ziran ^{[4
,5
]}

Chen, Jianghua ^{[1
,2
]}

Li, Hongjian ^{[6
]}

Wang, Lingling ^{[1
,2
]}

机构：

[1] Hunan Univ, Sch Phys & Elect, Coll Mat Sci & Engn, Ctr High Resolut Electron Microscopy, Changsha 410082, Hunan, Peoples R China

[2] Hunan Univ, Sch Phys & Elect, Key Lab Micronano Phys & Technol Hunan Prov, Changsha 410082, Hunan, Peoples R China

[3] Changsha Univ Sci & Technol, Sch Phys & Elect Sci, Changsha 410004, Hunan, Peoples R China

[4] Hunan Normal Univ, Key Lab Low Dimens Struct & Quantum Manipulat, Minist Educ, Dept Phys, Changsha 410081, Hunan, Peoples R China

[5] Hunan Normal Univ, Synerget Innovat Ctr Quantum Effects & Applicat, Changsha 410081, Hunan, Peoples R China

[6] Cent S Univ, Sch Phys & Elect, Changsha 410083, Hunan, Peoples R China

来源：

OPTICS EXPRESS | 2019年 / 27卷 / 21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：

PLASMON-INDUCED TRANSPARENCY; PERFECT ABSORBER; GRAPHENE; ABSORPTION; LAYER;

D O I：

10.1364/OE.27.031062

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Traditional absorbers are usually sandwich structures in which a metallic ground plane is employed to prevent the transmission. Such absorbers suffer from a major drawback that incident light can only irradiate from the front of the absorbers. In this paper, a novel absorber with bulk Dirac semimetal (BDS)-AlCuFe quasicrystals is proposed to realize bidirectional and dynamically tunable terahertz (THz) perfect absorption. The proposed structure consists of two layers of AlCuFe plates with rectangular apertures and a dielectric spacer. By adjusting transverse distance between the top and bottom rectangular apertures, perfect absorption could be realized under TM polarization. Simulation results show that perfect absorption can be obtained whether light irradiates from the front or back of the system, indicating a performance of bidirectional absorption. In addition, benefiting from the variable Fermi level of AlCuFe, the resonance frequency can be dynamically tuned in the THz range. Our work will stimulate more investigations on BDS-based bidirectional absorbers and optical modulators. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement

引用

页码：31062 / 31074

页数：13