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Title: Temperature- and electric-field-induced inverse Freedericksz transition in a nematogen with weak surface anchoring
Authors: Kumar, Arun T.
Sathyanarayana, P.
Sastry, V.S.S.
Takezoe, Hideo
Madhusudana, N.V.
Dhara, Surajit
Issue Date: 2-Jul-2010
Publisher: American Physical Society
Citation: Physical Review E, 2010, Vol.82, p011701
Abstract: We report electric field dependence of the anchoring transition in a mesogen on cooling in a cell with perfluoropolymer treated surfaces. Below a crossover voltage Vco the transition is discontinuous between planar and homeotropic alignments, and as the temperature is lowered, the transition temperature decreases quadratically with the field. Above Vco the transition is continuous between planar and tilted alignments, the transition temperature decreasing essentially linearly with the rms field. We develop a simple model to account for these results and argue that the higher field regime corresponds to a temperature driven inverse Freedericksz transition in which the director orientation starts tilting at the weakly anchored surfaces while the tilt angle remains zero at the midplane of the cell.
Description: Open Access
ISSN: 1550-2376 (Online)
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Copyright: 2010 American Physical Society
Appears in Collections:Research Papers (SCM)

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