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Schematic illustration of configuration of PVA-Ag-R6G film and excitation-detection. The PVA acts as a matrix while silver nanoparticles as scattering centers and R6G as a light emitting material. The film thickness is about . The sample is pumped by the second harmonics of a mode-locked Nd:YAG laser (, repetition rate, pulse duration). The inset is a photograph of the sample (top view).
(a) Optical absorption spectra of PVA-Ag-R6G film as a function of annealing times: (black), 30 (red), 60 (blue), 120 (dark yellow), 240 (navy), and (olive). (b) The difference spectra (open circles) between the annealed samples and as-prepared one along with the simulation (solid lines) by the Mie scattering theory and Drude model. The sample was annealed at .
Emission spectra as a function of pump energy for PVA-Ag-R6G film. The inset shows the emission spectra just below and above the pump threshold. The stripe width and length is and , respectively.
Evolution of emission intensity as a function of pump energy. The transition from spontaneous emission to laser irradiation is clearly indicated by the sharp increase in the slope. The inset is a photograph of emission when the pump energy is above threshold. At right is the sample while the left is the emission projected on a screen 12 cm away from the sample edge.
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