Universal condition for the existence of interface modes in the whole momentum space with arbitrary materials

TL;DR

This paper establishes a universal zero-impedance condition for interface modes across all momentum space in various material interfaces, supported by theoretical and experimental evidence, enabling better control and application of these modes.

Contribution

It introduces a universal zero-impedance condition applicable to any material interface, simplifying the identification and understanding of interface modes in diverse systems.

Findings

Universal zero-impedance condition exists for interface modes

Applicable to all material interfaces including photonic crystals and metamaterials

Supported by both theoretical analysis and experimental validation

Abstract

It is shown that, by theoretical and experimental results, a universal zero-impedance condition exists for two kinds of localized interface modes in the whole momentum space (both above and below the light line). It can be applied at the interface between any two materials including photonic crystals, single-negative (negative-permittivity or negative-permeability) materials, or double-negative metamaterials. In addition, it presents an intuitive physical concept, and also provides a feasible way to determine interface modes, which will have predominance in various applications.