scholarly journals Multi‐Band Tunable Chiral Metamaterial for Asymmetric Transmission and Absorption of Linearly Polarized Electromagnetic Waves

2020 ◽  
Vol 3 (12) ◽  
pp. 2000179
Author(s):  
Chen Xi Huang ◽  
Jing Jing Zhang ◽  
Lin Wu ◽  
Cheng Zhang ◽  
Jin Yang ◽  
...  
Keyword(s):  
Electromagnetic Waves ◽  
Asymmetric Transmission ◽  
Linearly Polarized ◽  
Transmission And Absorption ◽  
Chiral Metamaterial ◽  
Multi Band

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

Nanophotonics ◽  
2020 ◽  
Vol 9 (10) ◽  
pp. 3235-3242 ◽  
Author(s):  
Tingting Lv ◽  
Xieyu Chen ◽  
Guohua Dong ◽  
Meng Liu ◽  
Dongming Liu ◽  
...  
Keyword(s):  
High Performance ◽  
Light Propagation ◽  
Polarization State ◽  
Dual Band ◽  
Terahertz Waves ◽  
Asymmetric Transmission ◽  
Polarized Waves ◽  
Wide Range ◽  
Linearly Polarized ◽  
Chiral Metamaterial

AbstractPolarization 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.

scholarly journals High-Efficiency Asymmetric Transmission of Red-Near-Infrared Light Based on Chiral Metamaterial

2021 ◽  
Vol 9 ◽  
Author(s):  
Yu Tian ◽  
Zhiwei Chen ◽  
Fang-Fang Ren ◽  
Qingguo Du ◽  
Zhengying Li
Keyword(s):  
Communication Systems ◽  
High Efficiency ◽  
Polarized Light ◽  
Infrared Light ◽  
Polarization Conversion ◽  
Metamaterial Structure ◽  
Polarization Converter ◽  
Asymmetric Transmission ◽  
Linearly Polarized ◽  
Chiral Metamaterial

Designing and fabricating high-performance polarization converters that exhibit asymmetric transmission (AT), for light with different circularly/linearly polarized states with opposite propagating directions, are in high demand. The AT phenomenon leads to potential applications as isolators and circulators in information and communication systems. We propose a chiral metamaterial structure with high AT efficiency for two types of linearly orthogonal polarized red-near-IR light in two opposite incident directions. Theoretical results showed that the proposed chiral metamaterial structure achieves cross-polarization conversion where the polarization conversion ratio (PCR) is over 90%, in a broadband wavelength range from 715 to 810 nm, for both forward-propagating linearly polarized light and backward-propagating orthogonal linearly polarized light. The physical mechanisms of the polarization converter with the AT have been investigated. It was confirmed that the Fabry–Perot-like resonance and coupling between electric and magnetic dipoles lead to highly efficient asymmetric polarization conversion for two orthogonal linearly polarized light. Additionally, the conversion efficiency and bandwidth of the polarization converter are successfully optimized by adjusting the related structure parameters.

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