Dual-band dichroic asymmetric transmission of linearly polarized waves in terahertz chiral metamaterial

Nanophotonics

article

Tingting Lv¹  Jiaguang Han³  Weili Zhang³  Shuang Zhang⁴  Jinhui Shi¹  Xieyu Chen³  Guohua Dong¹  Meng Liu³  Dongming Liu²  Chunmei Ouyang³  Zheng Zhu¹  Yuxiang Li¹  Chunying Guan¹ 

[1] Key Laboratory of In-Fiber Integrated Optics of Ministry of Education, College of Science, Harbin Engineering University;School of Electronic Science, Northeast Petroleum University;Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering, Key Laboratory of Opto-electronics Information and Technical Science, Ministry of Education, Tianjin University;School of Physics and Astronomy, University of Birmingham

关键词: asymmetric transmission;    chiral metamaterial;    dichroic devices;    THz applications;   

DOI  :  10.1515/nanoph-2019-0507

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

Polarization conversion dichroism is of particular interest in manipulating the polarization state of light, whereas high-performance asymmetric transmission (AT) of linearly polarized waves is still inaccessible in the terahertz range. Here, a bilayer chiral metamaterial consisting of orthogonally chained S-shaped patterns with broken symmetry along the light propagation direction is proposed and demonstrated experimentally to realize a dual-band dichroic AT effect for linearly polarized terahertz waves. The AT effects are robust across a wide range of incident angles. The observed strong AT can be theoretically explained by a multiple reflection and transmission interference model and the transfer matrix method. The proposed bilayer chiral metamaterial may have broad applications in polarization manipulation, chiral biosensing and direction-dependent information processing.

【 授权许可】

CC BY