Photorefractive gratings have been obtained with 632.8 nm writing beams in organic–inorganic SiO2-based films. The hybrid glass is prepared by a sol–gel technique, starting from organic Si precursors, and contains Disperse Red 1 (DR1), carbazole units and 2,4,7-trinitro-9-fluorenone (TNF). The photorefractive gain, which has been found unexpectedly even without poling field, has been determined through an asymmetric energy exchange by two-beam coupling measurements. The effects of the polarization of the writing beams and of a circularly polarized photoisomerizing radiation during the erasure of the grating have been interpreted in terms of an orientational contribution to the grating formation.
Photorefractive gratings in DR1-doped hybrid sol-gel films / Raschella, R.; Marino, Iari Gabriel; Lottici, Pier Paolo; Bersani, Danilo; Lorenzi, Andrea; Montenero, Angelo. - In: OPTICAL MATERIALS. - ISSN 0925-3467. - 25:(2004), pp. 419-423. [10.1016/j.optmat.2003.10.002]
Photorefractive gratings in DR1-doped hybrid sol-gel films
MARINO, Iari Gabriel;LOTTICI, Pier Paolo;BERSANI, Danilo;LORENZI, Andrea;MONTENERO, Angelo
2004-01-01
Abstract
Photorefractive gratings have been obtained with 632.8 nm writing beams in organic–inorganic SiO2-based films. The hybrid glass is prepared by a sol–gel technique, starting from organic Si precursors, and contains Disperse Red 1 (DR1), carbazole units and 2,4,7-trinitro-9-fluorenone (TNF). The photorefractive gain, which has been found unexpectedly even without poling field, has been determined through an asymmetric energy exchange by two-beam coupling measurements. The effects of the polarization of the writing beams and of a circularly polarized photoisomerizing radiation during the erasure of the grating have been interpreted in terms of an orientational contribution to the grating formation.File | Dimensione | Formato | |
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