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Volume 178, 2015
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Percolating plasmonic networks for light emission control

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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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The article was received on 30 Sep 2014, accepted on 15 Oct 2014 and first published on 16 Oct 2014

Article type: Paper
DOI: 10.1039/C4FD00187G
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Citation: Faraday Discuss., 2015,178, 237-252

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    Percolating plasmonic networks for light emission control

    M. Gaio, M. Castro-Lopez, J. Renger, N. van Hulst and R. Sapienza, Faraday Discuss., 2015, 178, 237
    DOI: 10.1039/C4FD00187G

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