Coexistence of Localized and Delocalized Surface Plasmon Modes in Percolating Metal Films

Seal, Katyayani; Genov, Dentcho A.; Sarychev, Andrey K.; Noh, Heeso; Shalaev, Vladimir M.; Ying, Zhiliang; Zhang, Xiang; Cao, Hui

doi:10.1103/physrevlett.97.206103

Cited by 79 publications

(65 citation statements)

References 22 publications

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“…In particular, the near-eld intensity uctuations in random silver lms have been studied experimentally and explained in terms of the aggregate size distribution using percolation theory. 20 These systems have been extensively studied by scattering experiments aimed at identifying the plasmonic resonance. A different approach consists in studying the local density of optical states (LDOS), which is a fundamental quantity governing light-matter interactions.…”

Section: Introductionmentioning

confidence: 99%

Percolating plasmonic networks for light emission control

et al. 2015

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Optical nanoantennas have revolutionised the way we manipulate single photons emitted by individual light sources in a nanostructured photonic environment. Complex plasmonic architectures allow for multiscale light control by shortening or stretching the light wavelength for a fixed operating frequency, meeting the size of the emitter and that of propagating modes. Here, we study self-assembled semi-continuous gold films and lithographic gold networks characterised by large local density of optical state (LDOS) fluctuations around the electrical percolation threshold, a regime where the surface is characterised by large metal clusters with fractal topology. We study the formation of plasmonic networks and their effect on light emission from embedded fluorescent probes in these systems. Through fluorescence dynamics experiments we discuss the role of global long-range interactions linked to the degree of percolation and to the network fractality, as well as the local near-field contributions coming from the local electro-magnetic fields and the topology. Our experiments indicate that local properties dominate the fluorescence modification.

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Section: Introductionmentioning

confidence: 99%

Percolating plasmonic networks for light emission control

et al. 2015

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“…The coexistence of localized and delocalized surface plasmon modes at the percolation threshold has been proven theoretically [22] and experimentally [23], however it remains a challenge to find such percolation threshold conditions experimentally.…”

Section: Introductionmentioning

confidence: 99%

Optimum plasmon hybridization at percolation threshold of silver films near metallic surfaces

Maaroof¹,

Sutherland²

2010

J. Phys. D: Appl. Phys.

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés. Optimum plasmon hybridization at percolation threshold of silver films near metallic surfaces AbstractWe demonstrate experimentally a strong interaction and, plasmonic hybridization from a nanosystem having both localized and delocalized surface plasmons modes simultaneously in the presence of a nearby thin continuous metallic film. In situ DC resistance measurement of silver films and percolation theory was used to determine accurately the systems where the percolation threshold exists by distinguishing the nucleation and growth regions of silver films. We found an optimum plasmon hybridization existing in this percolation threshold region which can be verified from the absorption spectra. We interpret our data in terms of a fitting of the absorption spectra to the Fano type line shapes model.

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“…After all, the main requirements for SERS substrates are not only high reproducibility and robust fabrication procedure, but also large-area homogeneity, low cost, and possibility for mass production. One route for the fabrication of large-area structures with "hot spots" could be realized with the semi-continuous metallic films [27][28][29]. These films can be obtained by evaporation of noble metals like gold or silver onto a dielectric or semiconductor substrate.…”

Section: Introductionmentioning

confidence: 99%