Abstract
Semicontinuous metal-dielectric films are composed of a wide range of metal clusters of various geometries—sizes as well as structures. This ensures that at any given wavelength of incident radiation, clusters exist in the film that will respond resonantly, akin to resonating nanoantennas, resulting in the broad optical response (absorption) that is a characteristic of semicontinuous films. The physics of the surface plasmon states that are supported by such systems is complex and can involve both localized and propagating plasmons. This chapter describes near-field experimental and numerical studies of the surface plasmon states in semicontinuous films at critical and subcritical metal concentrations and evaluates the local field intensity statistics to discuss the interplay between various eigenmodes.
Highlights
IntroductionRandom metal-dielectric composites, such as nanoscaled semicontinuous metallic structures, exhibit unique optical and electrical transport properties [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26]
The high-order local field moments M2n correspond to the enhancement of multiphoton optical processes due to the excitation of surface plasmons (SP) resonances in the substrate
M4 relates to the electromagnetic enhancement of Raman-scattering provided that Raman active molecules are deposited on the metal surface
Summary
Random metal-dielectric composites, such as nanoscaled semicontinuous metallic structures, exhibit unique optical and electrical transport properties [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26]. At even higher metal concentrations, the sample becomes mostly metallic with dielectric voids, resulting in a uniform metal film From both theoretical predictions and experimental corroboration, it has been observed that under illumination with light at optical and near infrared frequencies, strong local field enhancement of up to 104 can be achieved on the surface of two-dimensional metal-dielectric composites [1, 10,11,12,13,14,15,16,17,18,19,20,21,22, 36]. We provide a comprehensive view of the interplay between localized and delocalized plasmon excitations in metal semicontinuous films through the analysis of experimentally and numerically obtained near-field intensity statistics
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