Organic-inorganic films based on SiO2, containing Disperse Red 1 (DR1), carbazole units and 2,4,7-trinitro-9-fluorenone(TNF), have been prepared by a sol-gel technique. Diffraction gratings have been produced through different effects: photoinduced birefringence and photorefractivity, using 488.0 nm and 632.8 nm light, respectively. Pure polarization holographic birefringence gratings have been investigated and diffraction efficiencies higher than those obtained by light intensity modulation have been measured. The study of the temporal behaviour of the diffraction efficiencies makes possible the identification of different processes involved in the DR1 molecular orientation: angular hole burning (AHB), angular redistribution (AR), Cis molecules decay and rotational diffusion. Photorefractive holographic gratings have been obtained without poling field. The photorefractive gain has been determined by two-beam coupling (2BC) measurements. The effect of the polarization of the writing beams on the grating and of a circularly polarized photoisomerizing radiation during grating erasure has been interpreted in terms of an orientation contribution to the grating formation.
Holographic gratings in hybrid sol-gel films / Raschella, R; Marino, Iari Gabriel; Lottici, Pier Paolo; Bersani, Danilo; Lorenzi, Andrea; Montenero, A.. - STAMPA. - 5123:(2003), pp. 117-124. [10.1117/12.517012]
Holographic gratings in hybrid sol-gel films
MARINO, Iari Gabriel;LOTTICI, Pier Paolo;BERSANI, Danilo;LORENZI, Andrea;
2003-01-01
Abstract
Organic-inorganic films based on SiO2, containing Disperse Red 1 (DR1), carbazole units and 2,4,7-trinitro-9-fluorenone(TNF), have been prepared by a sol-gel technique. Diffraction gratings have been produced through different effects: photoinduced birefringence and photorefractivity, using 488.0 nm and 632.8 nm light, respectively. Pure polarization holographic birefringence gratings have been investigated and diffraction efficiencies higher than those obtained by light intensity modulation have been measured. The study of the temporal behaviour of the diffraction efficiencies makes possible the identification of different processes involved in the DR1 molecular orientation: angular hole burning (AHB), angular redistribution (AR), Cis molecules decay and rotational diffusion. Photorefractive holographic gratings have been obtained without poling field. The photorefractive gain has been determined by two-beam coupling (2BC) measurements. The effect of the polarization of the writing beams on the grating and of a circularly polarized photoisomerizing radiation during grating erasure has been interpreted in terms of an orientation contribution to the grating formation.File | Dimensione | Formato | |
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