Nonlinear optical properties of composites based on conductive metal-alkanoate liquid crystals |
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Authors: | S Bugaychuk G Klimusheva Y Garbovskiy T Mirnaya A Ischenko |
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Institution: | (1) Institute of Physics, 46 Nauki Str., 03-028 Kiev, Ukraine;(2) Institute of General and Inorganic Chemistry, 32/34 Palladina Ave., 03-142 Kiev, Ukraine;(3) Institute of Organic Chemistry, 5 Murmanskaya Str., 02-142 Kiev, Ukraine |
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Abstract: | The dynamic holography in new composite materials based on a novel class of metal-alkanoate ionic liquid crystals (ILCs) is
studied experimentally and theoretically. The composites are formed as a dielectric dye film covered by lyotropic metal-alkanoate
ILC and ionic smectic glasses with doped dye molecules. The dynamic gratings are created by nanosecond pulses of double frequency
Nd:YAP laser, the recording demonstrates fast erasure time of residual thermal gratings. The nonlinear optical properties
are determined by the resonance nonlinearity in photosensitive centres of ILC. Note, that permanent relief gratings will be
formed on a dielectric dye film only as well as in composite cells either with nematic LC or with polymers under action of
pulsed laser radiation. Lyotropic ILC layer applied over the dye film provides the dynamic regime of grating recording in
composite cells. We found a secondary thermal grating is much smaller, the conductive ILC matrix provides effective heat dissipation
and erasure of this thermal grating. A theory of Raman-Nath self-diffraction holography on thin films followed from the wave
equation and the nonlinear mechanism of absorption saturation is developed to explain experimental results. |
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Keywords: | ionic liquid crystals dynamic holographic recording composites |
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