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Article
Nonphotochemical Laser-Induced Nucleation of Nematic Phase and Alignment of Nematic Director from a Supercooled Thermotropic Liquid Crystal
Physical Review E
  • Xiaoying Sun, New York University
  • Bruce A. Garetz, New York University
  • Michele F. Moreira, Kent State University - Kent Campus
  • Peter Palffy-Muhoray, Kent State University
Publication Date
2-1-2009
Document Type
Article
DOI
10.1103/PhysRevE.79.021701
Keywords
  • aqueous urea solutions,
  • polarization dependence,
  • reorientation
Disciplines
Abstract
A nonphotochemical laser-induced phase transition was studied in a supercooled 4′‐n-pentyl-4-cyanobiphenyl (5CB, also referred to as PCB and K15) liquid crystal, using linearly polarized 45 ps light pulses at a wavelength of 532 nm. The laser induced nucleation from the metastable supercooled isotropic phase to the nematic phase during slow cooling (0.001 °C∕min) and high light intensity (3.9 MW∕cm2). The resulting nematic director tended to be aligned along the direction of the plane of polarization of the light. At the intensities used, there is no observable laser-induced realignment of the director once the sample is in the nematic phase, nor any permanent laser-induced ordering when the sample is illuminated only in the stable isotropic phase during slow cooling. These experimental results are consistent with a mechanism based on optical Kerr alignment.
Comments

Copyright 2009 American Physical Society. Available on publisher's site at http://dx.doi.org/10.1103/PhysRevE.79.021701.

Citation Information
Xiaoying Sun, Bruce A. Garetz, Michele F. Moreira and Peter Palffy-Muhoray. "Nonphotochemical Laser-Induced Nucleation of Nematic Phase and Alignment of Nematic Director from a Supercooled Thermotropic Liquid Crystal" Physical Review E Vol. 79 Iss. 2 (2009)
Available at: http://works.bepress.com/peter_palffy-muhoray/21/