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

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

2010-08-27

arxiv.org/abs/1008.4809v1

Phys. Rev. Lett. 105, 176803 (2010)

Physics

Optics

5 pages; 5 figures

Scientific paper

10.1103/PhysRevLett.105.176803

Highly confined "spoof" surface plasmon-like (SSP) modes are theoretically predicted to exist in a perforated metal film coated with a thin dielectric layer. Strong modes confinement results from the additional waveguiding by the layer. Spectral characteristics, field distribution, and lifetime of these SSPs are tunable by the holes' size and shape. SSPs exist both above and below the light line, offering two classes of applications: "perfect" far-field absorption and to efficient emission into guided modes. It is experimentally shown that these plasmon-like modes can turn thin, weakly-absorbing semiconductor films into perfect absorbers.

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