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Proceedings Paper

Light scattering processes in nematic liquid crystals without alignment control
Author(s): B. Piccirillo; M. Lepore; E. Santamato
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Paper Abstract

Light scattering processes in unconfined nematic liquid crystals have been investigated by means of time-resolved transmittance and static light scattering techniques. In time-resolved experiments, sample temperature has been modulated and different modalities of propagation have been probed. The results here obtained show that a nematic polydomain liquid crystal exhibits scattering properties strongly different from a nematic monodomain and, in a sense, it behaves as an optically thin sample. Such a behaviour may be ascribed to the strong backscattering exhibited by the polydomain sample, as indicated by static light scattering experiments, where the angular dependence of the scattered intensity was measured, revealing a preferential backward direction. The two experimental techniques here adopted have shown their complementary role to understand the actual scattering regime. The diffusion constant D has been determined by means of time-resolved measurements and a comparison with the results obtained in monodomain nematic liquid crystals has been attempted.

Paper Details

Date Published: 20 April 2006
PDF: 10 pages
Proc. SPIE 6192, Organic Optoelectronics and Photonics II, 619237 (20 April 2006); doi: 10.1117/12.663732
Show Author Affiliations
B. Piccirillo, Univ. degli Studi di Napoli Federico II Unità INFM (Italy)
M. Lepore, Seconda Univ. degli Studi di Napoli and Unità INFM (Italy)
E. Santamato, Univ. degli Studi di Napoli Federico II Unità INFM (Italy)

Published in SPIE Proceedings Vol. 6192:
Organic Optoelectronics and Photonics II
Paul L. Heremans; Michele Muccini; Eric A. Meulenkamp, Editor(s)

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