Spatially coherent surface resonance states derived from magnetic resonances

TL;DR

This paper demonstrates that a specially designed metamaterial slab can support spatially coherent surface resonance states, enabling highly angle-selective thermal emission and robustness against structural disorder.

Contribution

It introduces a new metamaterial design that supports tunable, spatially coherent surface resonances with potential applications in directional thermal emission.

Findings

Supports nearly perfect angle-selective absorption

Exhibits robust spatially coherent thermal emission

Operates over a wide frequency range

Abstract

A thin metamaterial slab comprising a dielectric spacer sandwiched between a metallic grating and a ground plane is shown to possess spatially coherent surface resonance states that span a large frequency range and can be tuned by structural and material parameters. They give rise to nearly perfect angle-selective absorption and thus exhibit directional thermal emissivity. Direct numerical simulations show that the metamaterial slab supports spatially coherent thermal emission in a wide frequency range that is robust against structural disorder.