Spoof surface plasmon Fabry-Perot open resonators in a surface-wave photonic crystal

TL;DR

This paper introduces a novel spoof surface plasmon Fabry-Perot open resonator within a surface-wave photonic crystal, demonstrating unique monopolar resonance modes and subwavelength wave concentration through experimental microwave measurements.

Contribution

It presents the first experimental realization of a surface-wave FP open resonator leveraging a complete forbidden band gap for enhanced surface wave confinement.

Findings

Resonance frequencies lie within the photonic crystal's band gap.

The resonator exhibits a unique monopolar resonance mode.

Surface waves are concentrated in a subwavelength cavity.

Abstract

We report on the proposal and experimental realization of a spoof surface plasmon Fabry-Perot (FP) open resonator in a surface-wave photonic crystal. This surface-wave FP open resonator is formed by introducing a finite line defect in a surface-wave photonic crystal. The resonance frequencies of the surface-wave FP open resonator lie exactly within the forbidden band gap of the surface-wave photonic crystal and the FP open resonator uses this complete forbidden band gap to concentrate surface waves within a subwavelength cavity. Due to the complete forbidden band gap of the surface-wave photonic crystal, a new FP plasmonic resonance mode that exhibits monopolar features which is missing in traditional FP resonators and plasmonic resonators is demonstrated. Near-field response spectra and mode profiles are presented in the microwave regime to characterize properties of the proposed FP open resonator for spoof surface plasmons.