Trithiocarbonate-mediated free-radical photopolymerization: improved uniformity in hologram recording.
2006
A holographic material based on a photopolymerizable nematic acrylate was improved by the
addition of the trithiocarbonate, EtO2CCH2SC(S)SCH2CO2Et, increasing uniformity and
reproducibility in the formation of electrically switchable holographic gratings.
Diffraction efficiencies as high as
34%, the thin-grating theoretical maximum, were
achieved at large
(10-14 μm) grating spacings. Improved diffraction efficiency was seen
over a range of grating spacings
(0.35-10 μm). The exposure window for grating
formation was increased by an order of magnitude, resulting in much improved
reproducibility.
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