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Highly confined "spoof" surface plasmon-like (SSP) modes are theoreticallypredicted to exist in a perforated metal film coated with a thin dielectriclayer. Strong modes confinement results from the additional waveguiding by thelayer. Spectral characteristics, field distribution, and lifetime of these SSPsare tunable by the holes' size and shape. SSPs exist both above and below thelight line, offering two classes of applications: "perfect" far-fieldabsorption and to efficient emission into guided modes. It is experimentallyshown that these plasmon-like modes can turn thin, weakly-absorbingsemiconductor films into perfect absorbers.

Highly Confined Hybrid Spoof Surface Plasmons in Ultra-thin Metal/Dielectric Heterostructures