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Holographic diffraction gratings have been obtained in Disperse Red 1 (DR1)-doped silica and ORganically MOdified SILanes thin films (ORMOSILs), produced by tetraethylorthosilicate (TEOS) and 3-(triethoxysilyl)propyl isocyanate (ICPTEOS) as precursors for the sol-gel process. For the DR1+TEOS film, the grating is associated to an irreversible bleaching of the dye and may be detected by a Raman micro-spectroscopy...
Photo-induced birefringence has been measured by a pump-probe experiment in pure silica and ORMOSILs (ORganically MOdified SILanes) thin films containing Disperse Red 1 (DR1). The films are obtained via the sol-gel process using TEOS, GLYMO and ICPTEOS as precursors. Two characteristic relaxation times have been estimated for the relaxation of the birefringence: a short time, related to the Cis Trans...
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