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Optica Publishing Group
  • International Quantum Electronics Conference
  • OSA Technical Digest (Optica Publishing Group, 1998),
  • paper QThG15

Spectral dependence of selective photomodification and localization of optical excitation in silver fractal clysters

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Abstract

Irradiation of a nanocomposite medium, consisting of metal fractal clusters, by a strong laser pulse leads to the photoburning of a dichroic hole in the absorption spectrum near the laser wavelength.1 This phenomenon was interpreted as resulting from the localization of excitations in fractal clusters. It was shown theoretically mat the dipole (polar) eigenmodes formed by the interaction of monomers in cluster are localized in domains that are smaller than both the optical wavelength and the cluster size.2 The threshold photoburning of resonance eigenmodes responsible for light absorption at wavelength λ results in the appearance of a hole in the absorption spectrum near λ.

© 1998 Optical Society of America

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