Abstract
The giant enhancement of the optical response in metal nanocomposites and thin metallic films containing nanoscale surface features has been intensively studied in recent years.1 This enhancement is associated with the excitation of surface plasmons, collective electromagnetic modes whose characteristics are strongly dependent on the geometrical structure of the metallic component of the medium. Fractal structures were shown to possess the significant enhancement for a variety of optical processes, such as Raman scattering, four-wave mixing, quadratic electro-optical effect, and nonlinear absorption and refraction.1
© 1999 Optical Society of America
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