Abstract : We systematically investigate the metallic photoluminescence (MPL) emitted from plasmonic nanoparticles (NPs) upon excitation with ultrafast laser pulses using a scanning confocal optical microscope (SCOM). By comparing the emission spectra of Au NPs of varying dimensions with the corresponding dark-field scattering spectra, indications are found that MPL encompasses two emission channels: the particle plasmons (PPs) and the electron–hole (e–h) pair recombination. The plasmons can be interpreted to play a twofold role: in the excitation process they provide the local field enhancement, and in the emission process they offer extra radiation channels.
https://hal-utt.archives-ouvertes.fr/hal-02296873
Contributor : Daniel Gavrysiak
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Submitted on : Wednesday, September 25, 2019 - 3:37:10 PM
Last modification on : Thursday, September 26, 2019 - 1:26:06 AM
Jiyong Wang, Emre Gürdal, Anke Horneber, Simon Dickreuter, Sergei Kostcheev, et al.. Carrier recombination and plasmonic emission channels in metallic photoluminescence. Nanoscale, Royal Society of Chemistry, 2018, 10 (17), pp.8240-8245. ⟨10.1039/C7NR07821H⟩. ⟨hal-02296873⟩
