Eliminating Electromagnetic Scattering from Small Particles

TL;DR

This paper investigates conditions under which electrically small bi-anisotropic particles can achieve zero electromagnetic scattering, including backward, forward, and total scattering, by analyzing their polarizabilities and symmetries.

Contribution

It derives general conditions for zero scattering in uniaxial bi-anisotropic particles and explores specific classes like omega, chiral, and Tellegen particles, including numerical examples.

Findings

Zero backscattering and forward scattering conditions identified.

Scattering can be canceled via magneto-electric coupling.

Numerical examples demonstrate zero scattering configurations.

Abstract

This paper presents and discusses the conditions for zero electromagnetic scattering by electrically small particles. We consider the most general bi-anisotropic particles, characterized by four dyadic polarizabilities and study the case of uniaxially symmetric objects. Conditions for zero backward and forward scattering are found for a general uniaxial bi-anisotropic particle and specialized for all fundamental classes of bi-anisotropic particles: omega, "moving", chiral, and Tellegen particles. Possibility for zero total scattering is also discussed for aforementioned cases. The scattering pattern and polarization of the scattered wave are also determined for each particle class. In particular, we analyze the interplay between different scattering mechanisms and show that in some cases it is possible to compensate scattering from a polarizable particle by appropriate magneto-electric coupling. Examples of particles providing zero backscattering and zero forward scattering are presented and studied numerically.