How Light Is Emitted by Plasmonic Metals

Mertens, Jan; Kleemann, Marie-Elena; Chikkaraddy, Rohit; Narang, Prineha; Baumberg, Jeremy J.

doi:10.1021/acs.nanolett.7b00332

How Light Is Emitted by Plasmonic Metals

Journal Article · Mon Mar 06 23:00:00 EST 2017 · Nano Letters

DOI:https://doi.org/10.1021/acs.nanolett.7b00332· OSTI ID:1484729

Mertens, Jan ^[1]; Kleemann, Marie-Elena ^[1]; Chikkaraddy, Rohit ^[1]; Narang, Prineha ^[2]; ^[1]

Univ. of Cambridge (United Kingdom)
Harvard Univ., Cambridge, MA (United States)

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 discovered 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 demonstrate that prompt electronic Raman scattering is responsible and confirm that “photoluminescence”, which implies phase and energy relaxation, is not the right description. Our model indicates how to maximize light emission from metals.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Organization:: USDOE

OSTI ID:: 1484729

Journal Information:: Nano Letters, Journal Name: Nano Letters Journal Issue: 4 Vol. 17; ISSN 1530-6984

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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