How Light Is Emitted by Plasmonic Metals
American Chemical Society
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Mertens, J., Kleemann, M., Chikkaraddy, R., Narang, P., & Baumberg, J. (2017). How Light Is Emitted by Plasmonic Metals. Nano Letters, 17 (4), 2568-2574. https://doi.org/10.1021/acs.nanolett.7b00332
The mechanism by which light is emitted from plasmonic metals such as gold and silver has been contentious, particularly at photon energies below direct interband transitions. Using nanoscale plasmonic cavities, blue-pumped light emission is found to directly track dark-field scattering on individual nanoconstructs. By exploiting slow atomic-scale restructuring of the nanocavity facets to spectrally tune the dominant gap plasmons, this correlation can be measured from 600 to 900 nm in gold, silver, and mixed constructs ranging from spherical to cube nanoparticles-on-mirror. We show that prompt electronic Raman scattering is responsible and confirm that "photoluminescence", which implies phase and energy relaxation, is not the right description. Our model suggests how to maximize light emission from metals.
landau damping, plasmon, nanogap, nanoparticle on mirror, photoluminescence
Is supplemented by: https://doi.org/10.17863/CAM.8417
We acknowledge support from EPSRC grants EP/G060649/1, EP/L027151/1, EP/G037221/1, EPSRC NanoDTC, and ERC grant LINASS 320503. J.M. acknowledges support from the Winton Programme of the Physics of Sustainability. R.C. acknowledges support from the Dr. Manmohan Singh scholarship from St John’s College, University of Cambridge.
European Research Council (320503)
External DOI: https://doi.org/10.1021/acs.nanolett.7b00332
This record's URL: https://www.repository.cam.ac.uk/handle/1810/267087