Light reflection from a metal surface with subwavelength cavities

TL;DR

This paper investigates how light interacts with a metal surface featuring subwavelength cavities, revealing resonant reflection minima and developing an analytical model that aligns with experimental data, useful for light-matter coupling applications.

Contribution

It introduces an analytical model for light reflection on metal surfaces with subwavelength cavities, identifying localized and delocalized resonances and matching experimental results.

Findings

Resonant minima observed in reflection spectra.

Analytical model agrees with experimental data.

Identification of localized and delocalized resonances.

Abstract

The interaction of light with the localized/delocalized system, i.e., a metal surface with rectangular cavities of finite depth, has been studied. Reflection spectrum has been measured in the optical frequencies and resonant minima have been observed. We have developed an analytical model, which agrees well with the experiment. The localized waveguide resonance and delocalized surface resonance have been identified and discussed. The results may be useful for manipulating the coupling between light and matters.