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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 18, Iss. 11 — Nov. 1, 2001
  • pp: 1632–1638

Nonlocal dynamic gratings and energy transfer by optical two-beam coupling in a nematic liquid crystal owing to highly sensitive photoelectric reorientation

P. Pagliusi, R. Macdonald, S. Busch, G. Cipparrone, and M. Kreuzer  »View Author Affiliations


JOSA B, Vol. 18, Issue 11, pp. 1632-1638 (2001)
http://dx.doi.org/10.1364/JOSAB.18.001632


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Abstract

We investigate a new ultrahighly sensitive nonlinear optical response in pure nematic liquid crystals composed of rodlike molecules characterized by conjugated acetylene groups. Under the combined application of low-intensity optical waves and dc electrical fields, a photorefractivelike grating formation has been found in degenerate four-wave mixing experiments. Polarization-dependent pump–probe experiments reveal the underlying orientational effect of a space-charge field. The photorefractive-like origin of the gratings was proved by two beam-coupling experiments in which a refractive-index grating was phase shifted by π/2 with respect to the interference grating. The huge optical nonlinearity found in such materials makes them promising for future applications in all-optical image processing and adaptive optics.

© 2001 Optical Society of America

OCIS Codes
(160.2900) Materials : Optical storage materials
(160.3710) Materials : Liquid crystals
(160.5320) Materials : Photorefractive materials
(190.4400) Nonlinear optics : Nonlinear optics, materials
(190.5330) Nonlinear optics : Photorefractive optics

Citation
P. Pagliusi, R. Macdonald, S. Busch, G. Cipparrone, and M. Kreuzer, "Nonlocal dynamic gratings and energy transfer by optical two-beam coupling in a nematic liquid crystal owing to highly sensitive photoelectric reorientation," J. Opt. Soc. Am. B 18, 1632-1638 (2001)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-18-11-1632

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