Abstract
In this work, we report the existence of spoof localized surface plasmons (spoof-LSPs) arising with closed high contrast gratings (HCGs) at deep subwavelength scales, another platform for field localization at microwave frequencies. The HCGs are in the form of a periodic array of radial dielectric blocks with high permittivity around a metal core supporting spoof-LSPs of transverse magnetic (TM) form. Simulation results validate the phenomenon and a metamaterial approach is also given to capture all the resonant features of this kind of spoof-LSPs. In addition, experimental verification of the existence of spoof-LSPs supported by a three dimensional (3D) HCGs resonance structure in the microwave regime is presented. This work expands the original spoof-LSPs theory and opens up a new avenue for obtaining resonance devices in the microwave frequencies.
Highlights
Surface plasmons (SPs) are coherent delocalized electron oscillations that exist at the interface between a dielectric and a conductor at optical frequencies, which have been a hot spot due to the features of field enhancement and subwavelength field confinement[1,2,3]
Li28 theoretically demonstrated that subwavelength high contrast gratings (HCGs) on a perfect electric conductor (PEC) plane can support spoof surface plasmons, which is a generalization of spoof surface plasmons originated from subwavelength metallic gratings
With theoretical analysis and simulations, we show that HCGs in the form of a periodic array of radial dielectric blocks with high permittivity can support spoof-localized surface plasmons (LSPs) of transverse magnetic (TM) form, which is further validated through a metamaterial approximation to capture all the resonant features
Summary
Surface plasmons (SPs) are coherent delocalized electron oscillations that exist at the interface between a dielectric and a conductor at optical frequencies, which have been a hot spot due to the features of field enhancement and subwavelength field confinement[1,2,3]. The existence of spoof-LSPs in periodically textured PEC circular cavities with the same or multiple different grooves has been reported[22,23]. In these works, the textured metal surfaces www.nature.com/scientificreports/. Li28 theoretically demonstrated that subwavelength HCGs on a PEC plane can support spoof surface plasmons, which is a generalization of spoof surface plasmons originated from subwavelength metallic gratings It is of great interest and value to study whether spoof-LSPs could arise with closed subwavelength high contrast gratings around a metal core, which is the motivation of this paper. This work is a natural extension of the original concept of spoof-LSPs and can find potential applications in tunable designer-plasmonic sensors
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