Numerical study of optical absorption in two-dimensional metal-insulator and normal-superconductor composites

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

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Abstract

We analyze a random RLC lattice model for the optical properties of a two-dimensional normal metal-insulator composite, using the Y - Δ transformation algorithm developed by Frank and Lobb. Within such a model, the surface plasmon resonances of a Drude metal-insulator composite are modeled by the ac resonances of a random resistor-inductor-capacitor (RLC) network. The real part of the effective conductance is found to show a broad surface plasmon resonance peak below and above the threshold. An effective-medium (EM) calculation is in excellent agreement with the results of the simulations. We also calculate the far-infrared absorption in a model composite of normal metal and superconductor, using a lattice model. The absorption shows a strong absorption below the superconducting energy gap. An approximate calculation based on the EMA is again in excellent agreement with these results.

Original languageEnglish (US)
Number of pages1
JournalPhysica A: Statistical Mechanics and its Applications
Volume157
Issue number1
DOIs
Publication statusPublished - May 1 1989

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ASJC Scopus subject areas

  • Statistics and Probability
  • Condensed Matter Physics

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