Comment on 'Perfect drain for the Maxwell fish eye lens'

TL;DR

This paper argues that a proposed passive medium in Maxwell's fish eye lens acts only as a perfect absorber and cannot serve as a perfect drain for achieving perfect focusing, challenging previous claims.

Contribution

It clarifies that the non-magnetic loss material cannot mimic a perfect drain, thus questioning its role in achieving perfect focusing in Maxwell's fish eye lens.

Findings

Passive medium acts as a perfect absorber, not a perfect drain.

Cannot achieve perfect focusing in Maxwell's fish eye lens with this medium.

Challenges previous claims about the medium's capabilities.

Abstract

The non-magnetic loss material has been proposed (2011 New J. Phys. 13 023038) to mimic a passive perfect drain in the Maxwell's fish eye lens (MFL). In this comment, we argue that this passive medium can only be treated as a perfect absorber which can totally absorb all incident radiation without scattering by it, but it cannot mimic a perfect focusing point. As a result, this passive medium cannot help to achieve a perfect focusing in MFL.