Resonant Transmission of Electromagnetic Fields through Subwavelength Zero-$\epsilon$ Slits

TL;DR

This paper theoretically demonstrates a novel resonant electromagnetic transmission through zero-$\epsilon$ metamaterial slits, showing substantial transmission in subwavelength geometries due to a unique high-impedance resonance effect.

Contribution

It introduces a new resonant transmission mechanism in zero-$\epsilon$ metamaterial slits, distinct from traditional Fabry-Pérot resonances, with potential for enhanced wave transmission.

Findings

High transmission coefficients for broad slit geometries

Resonance effects unlike Fabry-Pérot resonances

Greater transmission in high-impedance ultranarrow channels

Abstract

We theoretically investigate the transmission of electromagnetic radiation through a metal plate with a zero-$\epsilon$ metamaterial slit, where the permittivity tends towards zero over a given bandwidth. Our analytic results demonstrate that the transmission coefficient can be substantial for a broad range of slit geometries, including subwavelength widths that are many wavelengths long. This novel resonant effect has features quite unlike the Fabry-P\'{e}rot-like resonances that have been observed in conductors with deep channels. We further reveal that these high impedance ultranarrow zero-$\epsilon$ channels can have significantly {\it greater} transmission compared to slits with no wave impedance difference across them.