Open AccessSpawning a ring of exceptional points from a metamaterial
Author(s) -
Ming Kang,
Weiren Zhu,
HuiTian Wang,
Malin Premaratne
Publication year - 2017
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.25.018265
Subject(s) - metamaterial , physics , dissipation , optics , scattering , hermitian matrix , eigenvalues and eigenvectors , reflection (computer programming) , matrix (chemical analysis) , split ring resonator , transformation optics , ring (chemistry) , reflection coefficient , quantum mechanics , materials science , computer science , chemistry , organic chemistry , composite material , programming language
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.