Diffraction gratings in polymer-dispersed liquid crystals recorded by means of polarization holographic technique

Cipparrone, G.; Mazzulla, A.; Russo, G.
February 2001
Applied Physics Letters;2/26/2001, Vol. 78 Issue 9, p1186
Academic Journal
We report an observation of holographic gratings recorded exposing a homogeneous mixture of pre-polymer and liquid crystal to a polarization light pattern. This polarization pattern is obtained by a superposition of two waves with orthogonal linear polarization. The idea to use this technique to realize holographic gratings come from the possibility of controlling the liquid crystal alignment inside the droplets, through the photoalignment, during the photoinduced polymerization process. On the contrary, the usual methods of writing diffraction gratings in polymer-dispersed liquid crystals are based on intensity holographic technique that controls the polymerization process. Diffraction gratings, composed of liquid crystal droplets having a particular internal alignment, are observed. © 2001 American Institute of Physics.


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