Electromagnetic energy within a magnetic infinite cylinder and scattering properties for oblique incidence

TL;DR

This paper analytically investigates electromagnetic energy storage and scattering properties of a magnetic infinite cylinder under oblique incidence, revealing universal relations and the influence of magnetism on diffusion in scattering media.

Contribution

It provides an analytical expression for internal electromagnetic energy and optical-absorption efficiency in magnetic cylinders, highlighting universal relations and magnetism's role in scattering behavior.

Findings

Derived an expression for internal electromagnetic energy in magnetic cylinders.

Established a universal relation between internal energy and absorption efficiency.

Showed magnetism enhances internal energy and reduces diffusion in scattering media.

Abstract

In this work we analytically calculate the time-averaged electromagnetic energy stored inside a nondispersive magnetic isotropic cylinder which is obliquely irradiated by an electromagnetic plane wave. An expression for the optical-absorption efficiency in terms of the magnetic internal coefficients is also obtained. In the low absorption limit, we derive a relation between the normalized internal energy and the optical-absorption efficiency which is not affected by the magnetism and the incidence angle. This mentioned relation, indeed, seems to be independent on the shape of the scatterer. This universal aspect of the internal energy is connected to the transport velocity and consequently to the diffusion coefficient in the multiple scattering regime. Magnetism favors high internal energy for low size parameter cylinders, which leads to a low diffusion coefficient for electromagnetic propagation in 2D random media.