The refractive index of the polymer n p is adjusted relative to the ordinary refractive index of dispersed droplets of nematic liquid crystal n o to regulate the angle of maximum transmission through a film in the presence of an applied field. Maximum transmission occurs at normal incidence when n p ≤n o with the breadth of the angle of view being largest at n p =n o . When np >n o , maximum transmission is peaked at an angle away from normal incidence, the value of the angle depending upon the ratio n p /n o . Angular discriminating filters are therefore possible with these films. The optical response of these materials as a function of applied field is also shown to be dependent on the ratio n p /n o as is the contrast exhibited by information displays. Methods for measuring the scattering cross section of a nematic droplet are also described.
Journal of Applied Physics
Copyright 1987 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in J. Appl. Phys. 62, 3925 (1987) and may be found at http://dx.doi.org/10.1063/1.339211.
WU, BG; West, John L; Doane, J. W (1987). Angular Discrimination of Light Transmission through Polymer-Dispersed Liquid-Crystal Films. Journal of Applied Physics 62(9) 3925-3931. doi: 10.1063/1.339211. Retrieved from https://oaks.kent.edu/chempubs/16