Pt-Symmetric Transport In Non-Pt-Symmetric Bi-Layer Optical Arrays

Keywords

PT-symmetry; quater stacks; unidirectional reflectivity

Abstract

We study transport properties of an array created by alternating (a, b) layers with balanced loss/gain characterized by the key parameter γ. It is shown that for non-equal widths of (a, b) layers, i.e., when the corresponding Hamiltonian is non PT- symmetric, the system exhibits the scattering properties similar to those of truly PT-symmetric models provided that without loss/gain the structure presents the matched quarter stack. The inclusion of the loss/gain terms leads to an emergence of a finite number of spectral bands characterized by real values of the Bloch index. Each spectral band consists of a central region where the transmission coefficient TN≥, and two side regions with N≤1. At the borders between these regions the unidirectional reflectivity occurs. Also, the set of Fabry-Perot resonances with T N=1 are found in spite of the presence of loss/gain.

Publication Date

9-1-2016

Publication Title

Journal of Optics (United Kingdom)

Volume

18

Issue

9

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1088/2040-8978/18/9/09LT01

Socpus ID

84988360861 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84988360861

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