Correlation and clustering in the optical properties of composites: A numerical study

X. C. Zeng, P. M. Hui, D. J. Bergman, D. Stroud

Research output: Contribution to journalArticle

34 Citations (Scopus)

Abstract

We have numerically investigated the effects of correlation and clustering on the far-infrared (FIR) absorption and surface-plasmon modes of a model two-dimensional metal-insulator composite. We model the composite as a diluted resistor-inductor-capacitor (RLC) network. Two-site and nearest-neighbor-site correlations among the conducting bonds are found to enhance the FIR absorption per metallic bond by a factor of 5 relative to a network of the same concentration with a purely random distribution of metallic bonds. Ring-shaped clusters (which model insulating particles with a metallic coating), and percolation clusters are found to produce a FIR absorption enhanced by more than 2 orders of magnitude per metallic bond. The surface-plasmon absorption peak in a percolation cluster is found to be strongly broadened relative to the predictions of the Maxwell Garnett approximation. In the two-site correlation model, the surface-plasmon absorption peak is weakly split, whereas in the nearest-neighbor site-correlation model, it is weakly red shifted. Ring-shaped clusters are found to produce double and triple peaks in the surface-plasmon frequency range. Possible explanations for these novel features are briefly discussed.

Original languageEnglish (US)
Pages (from-to)13224-13230
Number of pages7
JournalPhysical Review B
Volume39
Issue number18
DOIs
StatePublished - Jan 1 1989

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Optical properties
infrared absorption
Infrared absorption
optical properties
composite materials
Composite materials
RLC circuits
rings
inductors
two dimensional models
statistical distributions
resistors
capacitors
frequency ranges
Resistors
insulators
coatings
conduction
Capacitors
Metals

ASJC Scopus subject areas

  • Condensed Matter Physics

Cite this

Correlation and clustering in the optical properties of composites : A numerical study. / Zeng, X. C.; Hui, P. M.; Bergman, D. J.; Stroud, D.

In: Physical Review B, Vol. 39, No. 18, 01.01.1989, p. 13224-13230.

Research output: Contribution to journalArticle

Zeng, X. C. ; Hui, P. M. ; Bergman, D. J. ; Stroud, D. / Correlation and clustering in the optical properties of composites : A numerical study. In: Physical Review B. 1989 ; Vol. 39, No. 18. pp. 13224-13230.
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