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Giant Asymmetric Transmission and Circular Dichroism with Angular Tunability in Chiral Terahertz Metamaterials
Author(s) -
Liu Changji,
Huang Yuanyuan,
Hu Fangrong,
E Yiwen,
Dong Xiaoxiang,
Yang Yong,
Jin Yanping,
Xu Xinlong
Publication year - 2020
Publication title -
annalen der physik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.009
H-Index - 68
eISSN - 1521-3889
pISSN - 0003-3804
DOI - 10.1002/andp.201900398
Subject(s) - circular dichroism , metamaterial , chirality (physics) , circular polarization , dichroism , terahertz radiation , x ray magnetic circular dichroism , optics , materials science , condensed matter physics , physics , optoelectronics , magnetic circular dichroism , symmetry breaking , crystallography , quantum mechanics , chemistry , nambu–jona lasinio model , spectral line , microstrip , chiral symmetry breaking
Inspired by the chiral structure from mode interaction, a chiral terahertz metamaterial and its complementary structure with the coexistence of asymmetric transmission and circular dichroism response are designed. The asymmetric transmission happens in the presence of electric and magnetic modes perpendicular to each other, resulting from intrinsic chirality under normal incidence. Circular dichroism exists in the presence of electric and magnetic modes parallel to each other under oblique incidence because of extrinsic chirality. Both asymmetric transmission and circular dichroism are enhanced by complementary structures, benefitting from the coupling between adjacent units. The maximum of chiral parameter κ can achieve 450, which is one hundred times higher than previously reported. The chiral response can be tuned by the incident angle and is sensitive to the environmental refractive index. The results highlight the potential applications of these metamaterials in chiral sensing and polarization transformation devices.