High-order localized spoof surface plasmon resonances and experimental verifications

TL;DR

This paper demonstrates and verifies high-order radial spoof localized surface plasmon resonances in textured metal particles at microwave frequencies, combining theory, simulations, and experiments to explore their properties and potential applications.

Contribution

It introduces the first experimental verification of high-order radial spoof localized surface plasmons supported by textured metal particles, expanding understanding of spoof plasmonics.

Findings

High-order radial spoof plasmons observed in ultrathin disks.

Spectral and near-field properties match theoretical predictions.

Potential for broadband plasmonic device design.

Abstract

We theoretically demonstrated and experimentally verified high-order radial spoof localized surface plasmon resonances supported by textured metal particles. Through an effective medium theory and exact numerical simulations, we show the emergence of these geometrically-originated electromagnetic modes at microwave frequencies. The occurrence of high-order radial spoof plasmon resonances is experimentally verified in ultrathin disks. Their spectral and near-field properties are characterized experimentally, showing an excellent agreement with theoretical predictions. Our findings shed light into the nature of spoof localized surface plasmons, and open the way to the design of broadband plasmonic devices able to operate at very different frequency regimes.