Journal of Applied Physics
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.
WU, BG; West, John L.; and 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 http://digitalcommons.kent.edu/chempubs/16