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Nonlinear properties of semiconductor-doped silica sol-gel films (Articolo in rivista)
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- Nonlinear properties of semiconductor-doped silica sol-gel films (Articolo in rivista) (literal)
- Anno
- 1995-01-01T00:00:00+01:00 (literal)
- Alternative label
J. Fick, G. Vitrant, A. Martucci, M. Guglielmi, S. Pelli, G.C. Righini (1995)
Nonlinear properties of semiconductor-doped silica sol-gel films
in Molecular crystals and liquid crystals science and technology. Section B, Nonlinear optics; Elsevier, Amsterdam (Paesi Bassi)
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- J. Fick, G. Vitrant, A. Martucci, M. Guglielmi, S. Pelli, G.C. Righini (literal)
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- ENSERG, Grenoble
Università di Padova
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- Titolo
- Nonlinear properties of semiconductor-doped silica sol-gel films (literal)
- Abstract
- Thin silica-titania films containing inclusions of CdS semiconductor microcrystals have been produced by the sol-gel technique. A large blue shift (62 nm) of the absorption edge is observed and attributed to quantum confinement in the nanometer size microcrystals. High negative nonlinearity (n2 ? - 310-8 cm2/kW) has been found in these films. We report on measurements of the wavelength dependence of this nonlinearity. In particular a high negative nonlinear refractive index has been observed for pump photon energies located near the bandgap and between the bandgap and half the bandgap. The nonlinear refraction index shows a slow decrease in time attributed to oxidation of the semiconductor. (literal)
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