Optic models for short-pitch cholesteric and chiral smectic liquid crystals
- 1 September 1998
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review E
- Vol. 58 (3), 3264-3272
- https://doi.org/10.1103/physreve.58.3264
Abstract
The optical properties of cholesteric and chiral smectic- liquid crystals having a pitch shorter than the light wavelength are studied, both theoretically and experimentally. A particular emphasis is placed on the optical activity. For smectics, the optical rotation is maximum for a tilt angle of and for light propagating orthogonally to the helix axis; for short-pitch cholesterics, the optical activity is, in any case, very small. The limits of validity of a recently proposed macroscopic model for such media are discussed, in the framework of a more general discussion on optical models for gyrotropic media. It is shown that the macroscopic models generally work well for the bulk properties. However, for chiral smectics with the smectic planes parallel or nearly parallel to the boundary planes, no homogeneous model is able to account for the gyrotropic properties, independently of how small the pitch is and for any sample thickness. Our experimental data are in agreement with these theoretical findings.
Keywords
This publication has 20 references indexed in Scilit:
- Performance of Conventional and Novel Deformed Helix Ferroelectric Liquid Crystal Display Operating ModesJapanese Journal of Applied Physics, 1996
- Optical activity of small-pitch helical-shaped dielectric mediaPhysical Review B, 1996
- Linear electro-optic effect in a cholesteric liquid crystalPhysical Review E, 1994
- Symmetry properties of anisotropic dielectric gratingsJournal of the Optical Society of America A, 1994
- X-ray measurement of the twist grain boundary angle in the liquid crystal analog of the Abrikosov phasePhysical Review Letters, 1993
- Abrikosov dislocation lattice in a model of the cholesteric–to–smectic-AtransitionPhysical Review A, 1988
- The blue phase of liquid crystalsSoviet Physics Uspekhi, 1985
- Analysis of anisotropic dielectric gratingsJournal of the Optical Society of America, 1983
- Apparent rotatory power of cholestericsJournal of Optics, 1980
- Theories of Optical Rotatory PowerReviews of Modern Physics, 1937