Nonreciprocal Scattering by PT-symmetric stack of the layers

TL;DR

This paper investigates nonreciprocal wave propagation in PT-symmetric layered structures, analyzing resonant scattering, beam dynamics, and symmetry breaking, supported by simulations.

Contribution

It introduces a detailed analysis of nonreciprocal scattering and beam splitting in PT-symmetric stacks, highlighting the effects of periodicity and layer parameters.

Findings

Nonreciprocal wave propagation observed in PT-symmetric layers.

Beam splitting occurs in the structure.

Symmetry breaking in field distribution for slant incidence.

Abstract

The nonreciprocal wave propagation in PT-symmetric periodic stack of binary dielectric layers characterised by balances loss and gain is analysed. The main mechanisms and resonant properties of the scattered plane waves are illustrated by the simulation results, and the effects of the periodicity and individual layer parameters on the stack nonreciprocal response are discussed. Gaussian beam dynamics in this type of structure is examined. The beam splitting in PT-symmetric periodic structure is observed. It is demonstrated that for slant beam incidence the break of the symmetry of field distribution takes place.