Wave scattering by objects made of small particles with pulsating permittivity

TL;DR

This paper investigates how pulsating refractive indices in small particles influence wave scattering, revealing shifts and new resonances in the scattered fields through analytical and numerical methods.

Contribution

It introduces a model for wave scattering by particles with pulsating permittivity and analyzes the impact on resonance behavior using scalar approximation and numerical simulations.

Findings

Pulsations significantly alter resonance frequencies.

New resonances emerge due to pulsating permittivity.

Deeps in scattering spectrum are observed.

Abstract

In this work we study the wave scattering by small dispersionless particles with pulsating refractive index. The scattered fields and their resonance frequencies are calculated by using scalar approximation and exponentially time-dependent permittivity. In addition, the scattering by single sphere with the pulsating permittivity is calculated numerically for different regimes of the pulsations. Our results suggest that the pulsations of the refractive index of the scatterer significantly affect the scattered field: existing resonances shift, additional resonances emerge, and deeps in the light scattering spectrum appear.