Figure 4
From: Influence of the layer thickness in plasmonic gold nanoparticles produced by thermal evaporation
PL spectra performed at 70 K in a-Si:H thin films with an Au-NPs layer in the visible (a) and infrared (b) regions.
The excitation source was the 457 nm laser line in (a) and the 514.5 nm laser line in (b). In (a) the arrows indicate in each spectrum the interband radiative transitions involving electrons in the sp-conduction band and holes in the d-band. The sharp peaks in the region 503–504 nm correspond to radiative transitions from spurious illumination in the room.
