Ultrabroadband reflective polarization convertor for terahertz waves

被引：207

作者：

Cheng, Yong Zhi ^{[1
,2
]}

Withayachumnankul, Withawat ^{[1
,3
]}

Upadhyay, Aditi ^{[3
]}

Headland, Daniel ^{[1
]}

Nie, Yan ^{[2
]}

Gong, Rong Zhou ^{[2
]}

Bhaskaran, Madhu ^{[3
]}

Sriram, Sharath ^{[3
]}

Abbott, Derek ^{[1
]}

机构：

[1] Univ Adelaide, Sch Elect & Elect Engn, Adelaide, SA 5005, Australia

[2] Huazhong Univ Sci & Technol, Sch Opt & Elect Informat, Wuhan 430074, Peoples R China

[3] RMIT Univ, Sch Elect & Comp Engn, Funct Mat & Microsyst Res Grp, Melbourne, Vic 3001, Australia

来源：

APPLIED PHYSICS LETTERS | 2014年 / 105卷 / 18期

基金：

澳大利亚研究理事会;

关键词：

METAMATERIALS; REFLECTARRAY;

D O I：

10.1063/1.4901272

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We design and experimentally demonstrate an ultrathin, ultrabroadband, and highly efficient reflective linear polarization convertor or half-wave retarder operating at terahertz frequencies. The metamaterial-inspired convertor is composed of metallic disks and split-ring resonators placed over a ground plane. The structure exhibits three neighboring resonances, by which the linear polarization of incident waves can be converted to its orthogonal counterpart upon reflection. For an optimal design, a measured polarization conversion ratio for normal incidence is greater than 80% in the range of 0.65-1.45 THz, equivalent to 76% relative bandwidth. The mechanism for polarization conversion is explained via decomposed electric field components that couple with different resonance modes of the structure. The proposed metamaterial design for enhancing efficiency of polarization conversion has potential applications in the area of terahertz spectroscopy, imaging, and communications. (C) 2014 AIP Publishing LLC.

引用

页数：4

共 19 条

[1] Room temperature terahertz phase shifter based on magnetically controlled birefringence in liquid crystals [J].