Abstract-Controllable broadband asymmetric transmission of terahertz wave based on Dirac semimetals

Linlin Dai, Yuping Zhang, John F. O’Hara, and Huiyun Zhang

 (a) PCR of linearly polarized wave, (b) the current densities in the top and bottom layers of the x-polarized wave at 1.389 THz and 1.668 THz, respectively.

https://www.osapublishing.org/oe/abstract.cfm?uri=oe-27-24-35784

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.

© 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement