Volume 53, Number 3, February 2001
|Page(s)||364 - 370|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 December 2003|
Plasmon-enhanced absorption by optical phonons in metal-dielectric composites
Université P. et M. Curie - Paris Cedex 05, France
2 Department of Physics, New Mexico State University - Las Cruces, NM 88003, USA
3 LMOV, CNRS UMR 8634, Université de Versailles Saint-Quentin 78035 Versailles, France
4 Department of Physics, Hong Kong University of Science and Technology Clear Water Bay, Hong Kong, PRC
Accepted: 20 November 2000
It is shown that in cermets, with metal percolating clusters in a dielectric host, the metal plasmon modes can strongly couple to the dielectric vibrational modes, optical phonons. In metal-dielectric percolation composites, the plasmon modes are capable of strong accumulation of the electromagnetic energy in small nanometer-sized areas, "hot spots". The local fields in the hot spots can be very large, leading to enhanced absorption by optical phonons of the dielectric. In our experiments, strongly enhanced absorption by the coupled plasmon-phonon modes has been observed in percolation composites.
PACS: 72.15.Gd – Galvanomagnetic and other magnetotransport effects / 05.70.Jk – Critical point phenomena
© EDP Sciences, 2001
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