# Scattering of partially coherent radiation by non-Hermitian localized structures having Parity-Time symmetry

## TL;DR

This paper presents a theoretical model analyzing how partially coherent light interacts with non-Hermitian structures exhibiting Parity-Time symmetry, revealing effects like unidirectional scattering suppression and spectral asymmetry.

## Contribution

It introduces an analytical approach combining classical coherence theory with non-Hermitian physics to study scattering phenomena in PT-symmetric structures.

## Key findings

- Unidirectional scattering can be suppressed by the coherence properties of the radiation.
- Spectral asymmetries arise due to the non-Hermitian nature of the structure.
- Analytical expressions for the spectral density in the far zone are derived.

## Abstract

A theoretical model based on two-point scatterers is suggested to investigate scattering of partially coherent radiation by a non-Hermitian localized structure, invariant under the simultaneous symmetry operations of parity inversion and time reversal. Within the first-order Born approximation, and the formalism of classical coherence theory, the spectral density of the scattered field in the far zone is obtained analytically. We find that the unidirectional character of the scattered radiation, which is one of the principal effects present in non-Hermitian structures, may be suppressed due to the coherence properties of the radiation without changing the geometry of the structure. Asymmetric spectral changes of the scattered radiation due to the non-Hermitian character of the material are also observed.