Confining the light wave by using non-Euclidean transformation optics

TL;DR

This paper introduces a novel approach using non-Euclidean transformation optics to confine light waves in inhomogeneous dielectric media, enabling subwavelength light confinement.

Contribution

It presents a new theoretical framework explaining light confinement via non-Euclidean transformation optics and demonstrates how specific inhomogeneous media can focus and trap light.

Findings

Inhomogeneous dielectric media can focus plane waves.

Subwavelength light confinement is achievable with this method.

Absorbers placed strategically enhance light confinement.

Abstract

A new way to understand why some inhomogeneous dielectric medium can be used for confining the light wave has been given by using non-Euclidean transformation optics. We show that special inhomogeneous dielectric medium, which corresponds to a dip in the reference space, can be used for focusing a plane wave. If we set an absorber at the appropriate position of this medium, we can highly confine the light on the subwavelength scale.