期刊
NANOSCALE
卷 10, 期 17, 页码 8240-8245出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/C7NR07821H
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资金
- Deutscher Akademischer Austauschdienst [57049688]
- Chinese Research Council (CSC)
- Open fund of Top Key Disciplines of Hangzhou Dianzi University, China
- Institutional Strategy of the University of Tubingen (Deutsche Forschungsgemeinschaft [ZUK 63]
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.
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