Fig. 10

Plasmonic fingerprints in the emission process of metallic photoluminescence. a Normalized OPL (solid line) and dark-field scattering (open squares) spectra of single gold discs. The disc diameter ranges from 60 to 140 nm with a step of 20 nm. Reprinted with permission from ACS Nano 2012, 6, 10,147–10155. Copyright 2012 American Chemical Society. b Normalized OPL (solid line) and dark-field scattering (open circles) spectra of single gold NRs. Inset: Relationship between the photoluminescence and scattering maxima. Reprinted with permission from ACS Nano 2012, 6(8), 7177–7184. Copyright 2012 American Chemical Society. c Normalized TPL and dark-field scattering spectra of single gold discs. The scale bar in the SEM images represents 100 nm. Three emission modes are visible in the TPL spectra: one mode whose peak position shifts to longer wavelengths as the disc size increases (mode 1) and two nearly stationary modes with a shoulder centered at 540 nm (mode 2, blue dashed line) and a sharper peak situated at around 630 nm (mode 3, green dashed line). Reprinted with permission from Nanoscale 2018, 10, 8240–8245. Copyright 2018 Royal Society of Chemistry. d Sketch for the physical mechanism of the photoluminescence emission. PPs represent particle plasmons. Reprinted with permission from Nanoscale 2018, 10, 8240–8245. Copyright 2018 Royal Society of Chemistry