Abstract
Metal nanoshells are a unique type of nanoparticle composed of a semiconductor or dielectric core coated with an ultrathin conductive layer. Metal nanoshells possess attractive optical properties similar to metal colloids: a strong optical absorption and an extremely large and fast third-order nonlinear optical (NLO) polarizability associated with their plasmon resonance. However, unlike simple metal colloids, the plasmon resonance frequency of metal nanoshells depends dramatically on the relative size of the nanoparticle core and the thickness of the metallic shell. By adjusting the relative core and shell thicknesses, the plasmon resonances of these concentric sphere nanoparticles can be selectively placed to absorb light anywhere across a broad wavelength range in the visible and near infrared region of the electromagnetic spectrum. We have recently studied the plasmon shift and line broadening mechanisms in 50 nm nanoparticles consisting of a gold sulfide core with a gold shell.1
© 1999 Optical Society of America
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