Metal nanoparticle plasmonics inside reflecting metal films
- Publication Type:
- Journal Article
- Applied Physics Letters, 2010, 96 (24)
- Issue Date:
Oxide coated metal nanoparticles buried within a thin metal layer support a surface plasmon resonance. A local dip occurs in spectral reflectance along with a switching off of the film's plasmonic response. Models are introduced in which these resonances are tunable by altering the ratio of oxide thickness to core particle radius. The optical response of two experimental examples is presented and modeled using effective medium theory. Beyond the resonance zone the doped layer switches back to the plasmonic response of a nanoporous version of the host metal whose effective plasma frequency arises only from the percolating component. © 2010 American Institute of Physics.
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