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

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