Switchable Bragg Diffraction from Liquid Crystal in Colloid-Templated Structures

We have incorporated nematic liquid crystal into periodic, polymer host structures templated from self-assembled colloids. Using these composite materials, we demonstrate the first electrically switchable three-dimensional Bragg diffraction. The switchable beam deflection is potentially useful for non-mechanical beam steering and optical beam splitting devices. We have compared the electro-optic response of our templated liquid-crystal/polymer composites with conventional polymer-dispersed liquid crystals (PDLCs). Our data indicate a qualitatively different response for liquid crystal distributed within a connected cavity network, as compared to isolated liquid crystal droplets within a polymer matrix.