Optical characterization of a dual-frequency hybrid aligned nematic liquid crystal cell
Optics Express, Vol. 13, Issue 7, pp. 2627-2633 (2005)
http://dx.doi.org/10.1364/OPEX.13.002627
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Abstract
The dielectric anisotropy of a highly dispersive dual-frequency nematic liquid crystal (MDA-00-3969 (Merck KGa)) has been determined using the optical fully-leaky guided-mode technique. A 4Vrms sinusoidal voltage was applied across a 5µm hybrid aligned nematic (HAN) cell at various frequencies in both the positive and negative dielectric anisotropy regime. Optical data was collected at each frequency enabling the director profile in each case to be determined using a multi-layer optics model in combination with a liquid crystal free-energy minimization routine. The thresholdless response of the HAN cell combined with the extreme sensitivity of the optical characterization technique has allowed subtle changes in dielectric permittivity with frequency to be observed. The resulting measured dispersion shows excellent agreement with a single Debye-type relaxation model.
© 2005 Optical Society of America
OCIS Codes
(160.3710) Materials : Liquid crystals
(310.3840) Thin films : Materials and process characterization
ToC Category:
Research Papers
History
Original Manuscript: March 10, 2005
Revised Manuscript: March 22, 2005
Published: April 4, 2005
Citation
S. Jewell and J. R. Sambles, "Optical characterization of a dual-frequency hybrid aligned nematic liquid crystal cell," Opt. Express 13, 2627-2633 (2005)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-13-7-2627
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References
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