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Spectroscopie transitoire et photo-commutation des propriétés optiques non linéaires de second ordre de cristaux photochromes d'anils, corrélation structure-propriétés

Abstract : A séries of original anils, crystallizing in a non centrosymmetric space group for second harmonic génération (SHG) and showing crystalline state photochromism was synthesized. One of them has an SHG intensity of 11 (vs urea), a second one shows a photo conversion of 16%, and a third one is a quasi bistable system (thé lifetime of thé métastable fonn is 460 days). Photo induced réversible SHG change can be up to 50%. Studies on single crystals performed on a confocal microscope allowed to correlate SHG anisotropy and thé structure determined by X ray diffraction connected with ZINDO calculations. Under UV irradiation, a structural disorder is created within thé crystal, responsible for thé SHG intensity change. However, thé initial structure is recovered alter thé reverse réaction. Spectroscopy evidenced thé mechanism of thé photochromism, and showed that switching occurred in 250 ps in solid state. This result demonstrates thé potentiality of such materials as fast optical switches.
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https://tel.archives-ouvertes.fr/tel-00133784
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Submitted on : Tuesday, February 27, 2007 - 4:44:09 PM
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  • HAL Id : tel-00133784, version 1

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Michel Sliwa. Spectroscopie transitoire et photo-commutation des propriétés optiques non linéaires de second ordre de cristaux photochromes d'anils, corrélation structure-propriétés. Physique [physics]. École normale supérieure de Cachan - ENS Cachan, 2005. Français. ⟨tel-00133784⟩

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