Scattering properties of a PT dipole

TL;DR

This paper investigates the electromagnetic scattering properties of a PT-symmetric dipole through analytical and numerical methods, revealing asymmetries and the limits of the Born approximation in different scattering regimes.

Contribution

It provides a combined analytical and numerical analysis of PT dipole scattering, demonstrating asymmetry effects and the applicability limits of the Born approximation.

Findings

Asymmetry in scattering field with dipole orientation

Born approximation valid in weak scattering regime

Deviations observed for strong scatterers and near-field

Abstract

Electromagnetic response of PT-dipole is studied both analytically and numerically. In analytical approach, dipole is represented by two point scatterers. Within the first Born approximation, the asymmetry of the scattering field with respect to the orientation of dipole is proven. In numerical simulations, dipole is represented by two infinitely long, parallel cylinders with opposite sign of imaginary part of refractive index. Numerical data confirm the validity of the Born approximation in the weak scattering limit, while significant deviations from the Born approximation were observed for stronger scatterers and in the near-field range.