Carrier recombination and plasmonic emission channels in metallic photoluminescence

Jiyong Wang (1, 2, 3) , Emre Gürdal (3, 4) , Anke Horneber (1, 3) , Simon Dickreuter (3, 4) , Serguei Kochtcheev (2) , Alfred Meixner (1, 3) , Monika Fleischer (3, 4) , Pierre-Michel Adam (2) , Dai Zhang (1, 3)

1 Eberhard Karls Universität Tübingen = Eberhard Karls University of Tuebingen
2 L2n - Lumière, nanomatériaux et nanotechnologies
3 Center for Light-Matter Interaction, Sensors & Analytics (LISA+)
4 Institute for Applied Physics [Tübingen]

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.

Domaines: Micro et nanotechnologies/Microélectronique; Optique / photonique

Jiyong Wang, Emre Gürdal, Anke Horneber, Simon Dickreuter, Serguei Kochtcheev, et al.. Carrier recombination and plasmonic emission channels in metallic photoluminescence. Nanoscale, 2018, 10 (17), pp.8240-8245. ⟨10.1039/C7NR07821H⟩. ⟨hal-02296873⟩