We report a study of diffraction gratings observed in planar cells of nematic mixture (cyanobiphenyl and cyanotriphenyl derivatives, E7) made with different aligning substrates. Under the combined application of very low intensity laser beams (1.8 mW/cm(2)) and low dc voltage (4 V), highly sensitive gratings have been observed in degenerate four-wave-mixing experiments. Beam coupling measurements confirm the photorefractive-like nature of the gratings. Interesting results are obtained using two different liquid crystals, depending on the aligning substrates. The observed behavior suggests the fundamental role of the interfaces in the photoinduced processes.

Surface-induced photorefractive-like effect in pure liquid crystals

PAGLIUSI, Pasquale;CIPPARRONE, Gabriella
2002-01-01

Abstract

We report a study of diffraction gratings observed in planar cells of nematic mixture (cyanobiphenyl and cyanotriphenyl derivatives, E7) made with different aligning substrates. Under the combined application of very low intensity laser beams (1.8 mW/cm(2)) and low dc voltage (4 V), highly sensitive gratings have been observed in degenerate four-wave-mixing experiments. Beam coupling measurements confirm the photorefractive-like nature of the gratings. Interesting results are obtained using two different liquid crystals, depending on the aligning substrates. The observed behavior suggests the fundamental role of the interfaces in the photoinduced processes.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11770/126712
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