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9 July 2001 Plasmon-enhanced absorption by optical phonons in cermets
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Cermet is mixture of nano-sized metallic grains and insulating matrix. When concentration in metal is large enough, the conducting particles are strongly interacting between each other. As predicted by V. Shalaev for fractal metallic clusters and experimentally verified, in the vicinity of the percolation threshold, the local electromagnetic field can be very large because of plasmon resonance in the metallic grains which may happen in a wide spectrum of frequencies. In this enhanced field region, the micro-crystallites of the matrix are immersed in these huge fields. In the spectral range of the optical phonon of the matrix there can be a very large absorption band because of the possible coupling between phonon of the matrix and resonance of the metallic grains. We experimentally observe this huge absorption in gold alumina cermets. The theoretical model is in good agreement with experimental results.
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Mireille Gadenne, Patrice Gadenne, Viktor A. Podolskiy, Ping Sheng, and Vladimir M. Shalaev "Plasmon-enhanced absorption by optical phonons in cermets", Proc. SPIE 4467, Complex Mediums II: Beyond Linear Isotropic Dielectrics, (9 July 2001);

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