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(a) In resonance and out of resonance Er PL emission around for the Er reference sample before and after Au implantation followed by a thermal treatment at ; PL intensity is normalized to one for the Er reference sample and consequently rescaled for the co-implanted one. (b) Excitation spectra of PL emission at for the reference and the co-doped sample annealed at , measured using a Xe lamp.
EXAFS analysis of the Au -edge spectrum for , compared to that one of metallic Au. (a) EXAFS spectra. (b) -weighted Fourier transform moduli (in the range ) of the EXAFS spectra in (a); the Au-Au first shell fit for the sample is also reported; the spectra are not corrected for the phase shift.
Evolution of PL intensity at in resonance and out of resonance pumping conditions as a function of the annealing temperature for the Er and Au co-doped samples; the horizontal dot–dashed line refers to the PL signal at for the Er reference sample (single Er implantation and annealing at ) and it is normalized to one. For comparison, the PL intensity of the co-implanted and annealed samples was rescaled to the Er-reference sample.
Optical absorption spectra of Er-doped silica after Au implantation followed by annealing at different temperatures. Measurements were performed using an undoped silica film as reference.
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