Small-particle composites. I. Linear optical properties

V. Markel, Vladimir M. Shalaev, Ellen Stechel

Research output: Contribution to journalArticle

214 Citations (Scopus)

Abstract

Absorption and extinction spectra of fractal and nonfractal small-particle composites are studied. General solutions of the coupled-dipole equations with the exact operator for the dipole interaction (including the near-, intermediate-, and far-zone terms) are found and compared with those in the quasistatic approximation. Broad-scale numerical simulations of optical spectra for clusters containing a large number of particles (up to 10 000) are performed. A significant fraction of dipolar eigenmodes in fractal aggregates is shown to be strongly localized. The eigenmodes cover a wide spectral region providing resonant enhancement in the visible and infrared parts of the spectrum. In contrast to previous predictions, the absorption spectrum is shown to be significantly different from the spectral distribution of the density of dipole eigenmodes. It clearly indicates the importance of symmetry properties of the modes and corresponding selection rules for the absorption by different modes in random fractal composites. Our experimental data obtained for extinction spectra of silver colloid fractal aggregates are in good agreement with the results of numerical simulations.

Original languageEnglish
Pages (from-to)2425-2436
Number of pages12
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume53
Issue number5
DOIs
Publication statusPublished - Jan 1 1996

Fingerprint

Fractals
fractals
Optical properties
optical properties
composite materials
Composite materials
dipoles
extinction
absorption spectra
Computer simulation
Colloids
colloids
optical spectrum
Absorption spectra
Silver
simulation
silver
Infrared radiation
operators
augmentation

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Small-particle composites. I. Linear optical properties. / Markel, V.; Shalaev, Vladimir M.; Stechel, Ellen.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 53, No. 5, 01.01.1996, p. 2425-2436.

Research output: Contribution to journalArticle

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