Broadband enhanced transmission through the stacked metallic multi-layers perforated with coaxial annular apertures

TL;DR

This study demonstrates broadband enhanced electromagnetic transmission through stacked metallic layers with coaxial annular apertures, achieved via guided resonance mode hybridization, with experimental validation matching theoretical predictions.

Contribution

It introduces a novel multi-layer metallic structure with coaxial apertures that achieves wideband transmission, expanding beyond single-frequency extraordinary transmission.

Findings

Achieved about 60% bandwidth of the central frequency.

Experimental results agree well with semi-analytical calculations.

Demonstrated hybridization of guided resonance modes across layers.

Abstract

This paper theoretically and experimentally presents a first report on broadband enhanced transmission through stacked metallic multi-layers perforated with coaxial annular apertures (CAAs). Different from previous studies on extraordinary transmission that occurs at a single frequency, the enhanced transmission of our system with two or three metallic layers can span a wide frequency range with a bandwidth about 60% of the central frequency. The phenomena arise from the excitation and hybridization of guided resonance modes in CAAs among different layers. Measured transmission spectra are in good agreement with calculations semi-analytically resolved by modal expansion method.