Abstract

We study a heterojunction cavity with one vacuum gap inserted between two dielectric slabs with conjugate complex refractive indices, i.e., of balanced gain and loss. This cavity is found to exhibit a multiple parity-time (PT) symmetry characterized by alternating symmetric and broken phases, when examined in terms of both of the eigenvalues of the scattering matrix. Scattering behaviors, including reflection and transmission, however, should be classified into three distinct types because a transition region may exist between the symmetric and broken phases. It is of particular interest that vanishing reflectance could occur for light waves input from both the left and right sides, though of different wave vectors, in the symmetric phases. Moreover, it is viable to attain unidirectional invisibility for light waves only input from the left side and simultaneously realize coherent perfect absorption and lasing for a given wave vector in the transition regions. These unique scattering behaviors can be easily tuned to suit a wide range of wave vectors by adjusting the gap width.

© 2018 Optical Society of America

Full Article  |  PDF Article
OSA Recommended Articles
Unidirectional reflectionless propagation in plasmonic waveguide-cavity systems at exceptional points

Yin Huang, Georgios Veronis, and Changjun Min
Opt. Express 23(23) 29882-29895 (2015)

Thresholdless characterization in space and time reflection symmetry electronic dimers

Fernande Fotsa-Ngaffo, Stephane Boris Tabeu, Senghor Tagouegni, and Aurélien Kenfack-Jiotsa
J. Opt. Soc. Am. B 34(3) 658-667 (2017)

Zero index metamaterials with PT symmetry in a waveguide system

Yangyang Fu, Yadong Xu, and Huanyang Chen
Opt. Express 24(2) 1648-1657 (2016)

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 (5)

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 (8)

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