Optically Switchable Reflection Gratings

In all the studies discussed, the grating is transmission-type, with the grating vector lying in the sample plane. Using azobenzene-containing polymer-stabilized and polymer-dispersed LCs (PSLCs and PDLCs), Running and coworkers 

In another study (Urbas et al., 2004b), the formulation of the mixture is different. It contains 35% of a nematic LC (E7) to which 3.5% of the LC azobenzene dopant (4-butyl-4-methyoxy-azobenzene) is added, with the rest being photopolymerizable monomer syrup. With such a formulation, polymerization is known to result in PDLC, in which phase-separated LC droplets are dispersed in the polymer matrix. When the photosensitive reactive mixture filled in an 

CHAPTER 11 TUNABLE DIFFRACTION GRATINGS BASED ON AZO MATERIALS 

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