Substrate-induced bianisotropy in metamaterials

TL;DR

This paper shows that substrates can induce bianisotropy in metamaterials by breaking symmetry, leading to magneto-electric coupling in all substrate-supported designs, which impacts their electromagnetic behavior.

Contribution

It reveals that substrates inherently induce bianisotropy in metamaterials, a factor previously overlooked in symmetric designs.

Findings

Substrate presence breaks symmetry in metamaterials.

Bianisotropy arises in all substrate-supported metamaterials.

Magneto-electric coupling is inevitable with substrates.

Abstract

We demonstrate that the presence of a supporting substrate can break the symmetry of a metamaterial structure, changing the symmetry of its effective parameters, and giving rise to bianisotropy. This indicates that magneto-electric coupling will occur in all metamaterials fabricated on a substrate, including those with symmetric designs.