PML Inspired Transparent Metamaterials

TL;DR

This paper introduces a novel class of perfectly transparent metamaterials based on coordinate transformations, enabling reflection-less electromagnetic transmission across all angles and frequencies, with potential for diverse practical applications.

Contribution

It applies coordinate stretching techniques from PMLs to create physically realizable, reflection-less metamaterials of arbitrary shapes, a first in the field.

Findings

Metamaterials are perfectly transparent and reflection-less.

The design is applicable to arbitrary shapes.

Potential for implementation as metasurfaces.

Abstract

Perfectly transparent metamaterial structures of arbitrary shapes, constructed from coordinate stretching and contractions, are presented. Coordinate stretching has been used for 2 decades in perfectly matched layers (PMLs) to electromagnetically simulate infinite domains in numerical techniques, but this concept is applied here for the first time to realize a physical transmission medium. The transparent medium does not scatter electromagnetic waves, i.e. it is reflection-less for all incidence angles and all excitation frequencies. It may be implemented in the form of metasurfaces and will clearly find a myriad of applications if it can be efficiently manufactured.