Holographically formed polymer dispersed liquid crystals

Bowley, C.C., Crawford, G.P., Yuan, H. Reflection from dual-domains in a holographically-formed polymer-dispersed liquid crystal material. AppL Phys. Lett. 74, 3096-3098 (1999)... 

C.C. Bowley, A.K. Fontecchio, G.P. Crawford, J.J. Lin, L. Li, S. Paris, Multiple gratings simultaneously formed in holographic polymer dispersed liquid crystal displays, Appl. Phys. ljett, 76, 523 (2000). 

Holographic polymer dispersed liquid crystals (H-PDLCs) are obtained by photopolymerisation of a hquid crystal-prepolymer mixture in the interference field of two or more laser beams [14,15]. This induces phase separation in which hquid crystalline material predominantly congregates in dark regions of the optical interference pattern [16,17]. As a result, holographic gratings with extremely high refractive-index contrast are formed. In addition, the diffraction efficiency of these gratings is electrically switchable the apphcation of an electric field results in reorientation of the nematic director field within... 

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