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Stable photorefractive memory effect in sol-gel materials

Abstract : We report on the synthesis and the optical characterization of a photorefractive sol-gel material which contains nonlinear azo chromophore and carbazole charge transporting molecules. Both of these functional groups are covalently attached to the silica based backbone. Thin sol-gel films exhibit stable optically nonlinear properties: the electro-optic coefficient r13 measured at 633 nm is found to be 17 pm/V one day after corona poling and 15 pm/V after three weeks and over a period of several months. Photorefractivity is demonstrated by two beam coupling experiments without external applied electric field. Sol-gel films present a stable photorefractive memory effect with a net internal gain of 200 cm-1
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https://hal-iogs.archives-ouvertes.fr/hal-00668507
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Submitted on : Thursday, February 9, 2012 - 5:45:49 PM
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Bruno Darracq, Michael Canva, Frédéric Chaput, Jean-Pierre Boilot, Didier Riehl, et al.. Stable photorefractive memory effect in sol-gel materials. Applied Physics Letters, American Institute of Physics, 1997, 70 (3), pp.292-294. ⟨10.1063/1.118396⟩. ⟨hal-00668507⟩

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