
Controllable broadband asymmetric transmission of terahertz wave based on Dirac semimetals
Author(s) -
Linlin Dai,
Yuping Zhang,
John F. O’Hara,
Huiyun Zhang
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.035784
Subject(s) - semimetal , metamaterial , terahertz radiation , broadband , physics , resonator , optics , dirac (video compression format) , polarization (electrochemistry) , graphene , transmission (telecommunications) , negative refraction , optoelectronics , materials science , telecommunications , band gap , quantum mechanics , chemistry , neutrino , computer science
We present a dynamic metamaterial based on Dirac semimetals and capable of realizing broadband and tunable asymmetric transmission in the terahertz region. The Dirac semimetal resonators have a chiral structure patterned with double-T resonators that results in partial polarization conversion of waves incident upon the material, leading to asymmetric transmission across a wide frequency range. We show how the gradual shift of the semimetal Fermi energy permits a method of control over the asymmetric total transmission.