Reference : Antiferroelectric liquid crystals with 45° tilt - a new class of promising electro-op...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
Antiferroelectric liquid crystals with 45° tilt - a new class of promising electro-optic materials
D’havé, K. [> >]
Dahlgren, A [> >]
Rudquist, Per [> >]
Lagerwall, Jan mailto [Chalmers University of Technology]
Andersson, G. [> >]
Matuszczyk, M. [> >]
Lagerwall, Sven T. [> >]
Dabrowski, R. [> >]
Drzewinski, W. [> >]
Taylor & Francis Ltd
Yes (verified by ORBilu)
[en] Antiferroelectric liquid crystals with a tilt angle of 45 degrees have very interesting optical properties, which seem to have been overlooked so far perhaps because such materials have hardly been available. We have prepared a four-component mixture of partially fluorinated compounds with a SmC/sub n/* phase in the interval between 27.4 degrees C and 121.6 degrees C, in which the tilt angle theta saturates at 45 degrees for T<or=80 degrees C, and we investigate the optical properties, theoretically and experimentally. One of the surprising features of 45 degree materials is that they permit a remarkably high contrast by virtue of an excellent dark-state, in spite of the fact that AFLC materials are notoriously difficult to align. This is because a 45 degrees AFLC turns out to be (negatively) uniaxial instead of biaxial. We describe these properties and propose a number of potentially interesting new applications, including a polarizer-free display mode and a three-level ``phase-only'' modulator.
Darmstadt, Germany August 29 - September 3, 1999

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