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Local field distribution in random metal–dielectric films; theory and experiment

✍ Scribed by Dentcho A. Genov; Katyayani Seal; Mark A. Nelson; Andrey K. Sarychev; Z.Charles Ying; Vladimir M. Shalaev

Publisher
Elsevier Science
Year
2003
Tongue
English
Weight
249 KB
Volume
338
Category
Article
ISSN
0921-4526

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✦ Synopsis

The local field properties of metal-dielectric films are investigated in terms of the probability distribution function (PDF). For metal coverage p; close to the percolation threshold we obtain a wide, lognormal PDF which for low metal concentrations gradually transforms into a scaling, power-law distribution function. Strong enhancement of the local fields in a broad spectral range is verified by an exact numerical procedure. In experimental studies, metal-dielectric films were synthesized by a pulsed laser deposition technique, and their optical properties were investigated using nearfield optical microscopy. The experimentally and numerically obtained probability functions are found to be in good agreement.

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