Spawning a ring of exceptional points from a metamaterial

Ming Kang, Weiren Zhu, Hui-Tian Wang, Malin Premaratne

Research output: Contribution to journalArticleResearchpeer-review

7 Citations (Scopus)

Abstract

Exceptional points(EPs) are degeneracies in non-Hermitian systems and give rise to counter intuitive, yet interesting physical effects. Inspired by the exotic physics of EP in designed metamaterials, we theoretically explore how an EPs-ring can be generated from a non-Hermitian resonant metamaterial bearing both dissipation and radiation losses. When the substrate thickness of this metamaterial is varied, the complex eigenvalues of the scattering matrix show a transition from single EP to a ring of EPs, where each EP is associated with maximally asymmetric reflection. We show that our scattering matrix based fitted coupled mode theory results agree very well with finite-difference time-domain simulations. Our work illustrates that the optical properties of the metamaterials can be dramatically altered by carefully tuning the dissipation and radiation losses.

Original languageEnglish
Pages (from-to)18265-18273
Number of pages9
JournalOptics Express
Volume25
Issue number15
DOIs
Publication statusPublished - 24 Jul 2017

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