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

Nanophotonics

Zhang Weili¹  Liu Meng¹  Chen Xieyu¹  Ouyang Chunmei¹  Han Jiaguang¹  Dong Guohua²  Lv Tingting²  Li Yuxiang²  Zhu Zheng²  Shi Jinhui²  Guan Chunying²  Liu Dongming³  Zhang Shuang⁴ 

[1] 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, Tianjin 300072, China;Key Laboratory of In-Fiber Integrated Optics of Ministry of Education, College of Science, Harbin Engineering University, Harbin 150001, China;School of Electronic Science, Northeast Petroleum University, Daqing 163318, China;School of Physics and Astronomy, University of Birmingham, Birmingham B15 2TT, UK;

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

DOI  :  10.1515/nanoph-2019-0507

来源: DOAJ

【 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】

Unknown