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Nonlinear Optical Response Of Polymer Dispersed Liquid Crystal Materials

Composite materials consisting of liquid crystal droplets dispersed in a polymer binder may be switched from an opaque scattering state to a clear transparent state by application of a d.c. or low frequency a.c. electric field.1-3 This optoelectronic response is the result of the effect of the external field on the birefringence of the liquid crystal contained in the droplets. The applied electric field serves to align the liquid crystal in an orientation such that the refractive index of the droplet is matched with that of the polymer binder. In this paper we report observations of a nonlinear scattering mechanism in polymer dispersed liquid crystal films due to reorientation of the liquid crystal molecules by the optical field of a CW argon ion laser. Preliminary observations show an 80% reduction in the transmittance of these materials due to laser induced scattering.