Paired cut-wire arrays for enhanced transmission of transverse-electric fields through sub-wavelength slits in a thin metallic screen

TL;DR

This paper demonstrates that pairing two metallic cut-wire arrays on opposite sides of a thin metallic screen significantly enhances the transmission of transverse-electric fields through sub-wavelength slits, revealing complex electric and magnetic resonances.

Contribution

It introduces a novel paired cut-wire array configuration that achieves richer electromagnetic resonances and enhanced transmission compared to single-array setups.

Findings

Enhanced transmission through paired arrays due to combined resonances

Identification of electric- and magnetic-type resonances

Potential for improved electromagnetic device engineering

Abstract

It has recently been shown that the transmission of electromagnetic fields through sub-wavelength slits (parallel to the electric field direction) in a thin metallic screen can be greatly enhanced by covering one side of the screen with a metallic cut-wire array laid on a dielectric layer. In this Letter, we show that a richer phenomenology (which involves both electric- and magnetic-type resonances) can be attained by pairing a second cut-wire array at the other side of the screen. Via a full-wave comprehensive parametric study, we illustrate the underlying mechanisms and explore the additional degrees of freedom endowed, as well as their possible implications in the engineering of enhanced transmission phenomena.