Experimental study demonstrates high-efficiency holographic recording in C60-doped nematics, indicating strong photorefractive behavior in the Raman-Nath regime.
Holographic gratings were recorded in C60-doped nematic liquid crystals (NLCs) by two-beam coupling. The asymmetric energy transfer dependence on the polarity of the applied voltage and multiple diffractions in two-beam coupling indicated that the gratings were photorefractive and worked in the Raman-Nath regime. The diffraction efficiencies (DEs) of the main diffraction orders were investigated at different applied voltages. The diffractive intensity distribution was asymmetric, and a first-order DE as high as 66% (as high as 84% excluding the influence of the scattering) was obtained from the 20 microm thick C60-doped NLC film.
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Zhang et al. (2009) studied this question.
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