# Electromagnetic interior transmission eigenvalue problem for inhomogeneous media containing obstacles and its applications to near cloaking

## TL;DR

This paper introduces a new electromagnetic cloaking method using interior transmission eigenvalues, involving a three-layer structure with isotropic media, achieving near-invisibility for arbitrary regular targets.

## Contribution

It proposes a novel cloaking scheme based on interior transmission eigenvalues with a three-layer isotropic medium structure, enabling near-invisibility for arbitrary regular media.

## Key findings

- Existence of infinite incident waves for near-invisibility
- Cloaking performance quantitatively characterized
- Design based on Maxwell-Herglotz approximation

## Abstract

This paper is concerned with the invisibility cloaking in electromagnetic wave scattering from a new perspective. We are especially interested in achieving the invisibility cloaking by completely regular and isotropic mediums. Our study is based on an interior transmission eigenvalue problem. We propose a cloaking scheme that takes a three-layer structure including a cloaked region, a lossy layer and a cloaking shell. The target medium in the cloaked region can be arbitrary but regular, whereas the mediums in the lossy layer and the cloaking shell are both regular and isotropic. We establish that there exists an infinite set of incident waves such that the cloaking device is nearly-invisible under the corresponding wave interrogation. The set of waves is generated from the Maxwell-Herglotz approximation of the associated interior transmission eigenfunctions. We provide the mathematical design of the cloaking device and sharply quantify the cloaking performance.