Electromagnetic Response of Clustered Charged Particles

Wenzheng Ye,Ting Yang,Chi Wang,Fei Gao,Xiaofeng Hu,Jing Jiang,Shuai Zhou

doi:10.3389/fmats.2021.739116

Abstract

Electromagnetic response of clustered charged particles is the foundation of electromagnetic wave interaction with various natural phenomena, such as sandstorm, cloud, and volcano eruption. Previous studies usually employed assumption of independent charged particles, without considering the coupling between them. Here, we build up a general numerical model considering the multiple scattering effect, and test it with a charged two- and four-particle system. The numerical results show that independence assumption fails, while the number density of clustered charged particles is getting larger. This work may pave the way for deeper understanding on the electromagnetic interaction of clustered charged particles.

Highlights

Sand/dust storm is a natural phenomenon that may cause signals of remote sensing and telecommunication being worsened due to the attenuation of electromagnetic waves (EMWs) by sand particles
Based on the T-matrix approach, the problem of electromagnetic waves scattered by a single-charged particle can be solved, and the influence of surface charged density and relative permittivity of the particle is investigated
For sizes of particles much smaller than the wavelength of the incident EMWs, the enhancement of extinction cross section by surface charge is enlarged with the higher surface charge density but reduced by higher permittivity of the particle

Summary

INTRODUCTION

Sand/dust storm is a natural phenomenon that may cause signals of remote sensing and telecommunication being worsened due to the attenuation of electromagnetic waves (EMWs) by sand particles. We build up a fully analytical theoretical frame based on the T-matrix formulism (Tsang et al, 2001; Mishchenko et al, 2002, 2006; Huang et al, 2020) to study the electromagnetic response of multi-particle systems consisting of electrically charged spherical particles with multiple scattering effect considered. The problem of plane waves scattered by a charged particle can be solved based on a T-matrix-based approach with modified boundary conditions, which is the generalized version of the Lorenz–Mie theory. The scattering of electromagnetic waves by homogeneous, isotropic sphere, which carries excess charge is tackled under the assumption that surface current is linearly related to the electric field parallel to the surface of the particle. The scattering cross section in charged particle clusters considering the multiple scattering effects is given by

RESULT

CONCLUSION

DATA AVAILABILITY STATEMENT