Volume 89, Issue 1, 01 January 2001
Index of content:
- LASERS, OPTICS, AND OPTOELECTRONICS (PACS 42)
89(2001); http://dx.doi.org/10.1063/1.1328057View Description Hide Description
Characteristic dark domains are observed around the tips of electrodes in in-plane switching-mode liquid crystal displays. In these domains, the liquid crystal molecules rotate in the reverse direction because of the radially distorted electric field. We found that these domains extend toward the central area when a higher voltage is applied. This article discusses these reverse-rotational domains.
Optical characterization of the director profile in a ferroelectric liquid crystal cell with homeotropic alignment89(2001); http://dx.doi.org/10.1063/1.1330549View Description Hide Description
The optictensor configurations (director profiles) in surface stabilized ferroelectric liquid crystal cells with homeotropic alignment are considerably simpler than in cells with the more conventional homogeneous alignment and, with the exception of thin surface regions, are essentially that of an unconstrained or “free” FLC sample. Previously the half-leaky guided mode (HLGM) technique, in which angle dependent reflectivity only is measured, has been used to characterize the director profile in such cells. The extended HLGM technique reported in this paper enables detection of both angle dependent reflectivity and transmissivity data. Combined analysis of these features significantly enhances the sensitivity of the original HLGM technique enabling the director profile in cells with homeotropic alignment to be explored in even greater detail.
89(2001); http://dx.doi.org/10.1063/1.1332801View Description Hide Description
Holographic grating originating from photothermal effects in guest-host liquid crystals was characterized using heat-conduction analysis and Fraunhofer’s diffraction theory. The refractive index distributions, which are caused by interference light illumination and photothermal optical nonlinearity, were determined by solving the heat-conduction equation numerically. The diffraction efficiencies, including the dependence of the sample temperature and the grating spacing, were determined from the diffraction theory, and those values showed good quantitative agreement with the experimental values.