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EnglishWe 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 pi /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.
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| Titolo: | Nonlocal dynamic gratings and energy transfer by optical two-beam coupling in a nematic liquid crystal owing to highly sensitive photoelectric reorientation | |
| Autori: | ||
| Data di pubblicazione: | 2001 | |
| Rivista: | ||
| Handle: | http://hdl.handle.net/20.500.11770/154862 | |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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|---|---|---|---|---|
| pr_JosaB2001.pdf | N/A | Non specificato | Administrator Richiedi una copia |
http://hdl.handle.net/20.500.11770/154862
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