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Optics Letters

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  • Vol. 28, Iss. 23 — Dec. 1, 2003
  • pp: 2369–2371

Optical two-beam coupling for a surface-induced photorefractive effect in undoped liquid crystals

Pasquale Pagliusi and Gabriella Cipparrone  »View Author Affiliations


Optics Letters, Vol. 28, Issue 23, pp. 2369-2371 (2003)
http://dx.doi.org/10.1364/OL.28.002369


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Abstract

We report beam-coupling measurements of undoped nematic planar cells, for which the surface-induced photorefractive effect (SIPRE) has been confirmed to be due to photoelectric interface activation. We show that the energy transfer strongly depends on experimental geometry. Diffraction efficiency and beam-coupling analyses suggest that the unusual local and (or) nonlocal behavior can be ascribed to an additional in-phase-modulated longitudinal electric field component, unaccountable by standard photorefractivity. We consider a simple charge distribution model of the SIPRE, which produces a space–charge field having two orthogonal modulated components, in phase and π/2 out of phase. Through the liquid crystal’s electric response, the exploited geometries verify the presence of the two components.

© 2003 Optical Society of America

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(190.4350) Nonlinear optics : Nonlinear optics at surfaces
(190.5330) Nonlinear optics : Photorefractive optics
(190.7070) Nonlinear optics : Two-wave mixing
(230.3720) Optical devices : Liquid-crystal devices
(240.6670) Optics at surfaces : Surface photochemistry

Citation
Pasquale Pagliusi and Gabriella Cipparrone, "Optical two-beam coupling for a surface-induced photorefractive effect in undoped liquid crystals," Opt. Lett. 28, 2369-2371 (2003)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-28-23-2369


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References

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