Abstract

We investigate the exceptional points (EPs) in chiral metasurfaces composed of periodic arrays of two orthogonally orientated graphene strips in the terahertz frequency. By tuning the geometric parameters and incident wavelengths, the EPs emerge as two eigenvalues of the transmission matrix coalesce. The EPs possess a certain chirality as light at the output is completely left- or right-handed circularly polarized (LCP or RCP). The chirality of the EPs is determined by the sign of two displacements of graphene strips along the horizontal and vertical directions, that is, RCP for the same sign and LCP for different signs. In addition, we show that the chirality of EPs is reversed when light is incident from the opposite direction of the metasurface. This study may have potential applications in polarization detection, manipulation, and ultrasensitive sensing by taking advantage of the non-Hermiticity present in the system.

© 2019 Optical Society of America

Full Article  |  PDF Article
More Like This
Chirality of exceptional points in bianisotropic metasurfaces

Ming Kang, Ting Zhang, Bo Zhao, Linshan Sun, and Jing Chen
Opt. Express 29(8) 11582-11590 (2021)

Exceptional point in a metal-graphene hybrid metasurface with tunable asymmetric loss

Shaoxian Li, Xueqian Zhang, Quan Xu, Meng Liu, Ming Kang, Jiaguang Han, and Weili Zhang
Opt. Express 28(14) 20083-20094 (2020)

Exceptional points in Fano-resonant graphene metamaterials

Qingjie Liu, Bing Wang, Shaolin Ke, Hua Long, Kai Wang, and Peixiang Lu
Opt. Express 25(7) 7203-7212 (2017)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Figures (6)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Equations (4)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription

Metrics

You do not have subscription access to this journal. Article level metrics are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access OSA Member Subscription