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Molecular Crystals and Liquid Crystals Volume 646, 2017 - Issue 1: Proceedings of the 26th International Liquid Crystals Conference (ILCC 2016)
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Original Articles

Two-wave energy exchange in photorefractive hybrid cell with bent-core liquid crystal

I. P. PinkevychFaculty of Physics, Taras Shevchenko National University of Kyiv, Volodymyrska St. 64, Kyiv, UkraineCorrespondence[email protected]
,
V. Yu ReshetnyakFaculty of Physics, Taras Shevchenko National University of Kyiv, Volodymyrska St. 64, Kyiv, Ukraine
&
D. R. EvansAir Force Research Laboratory, Materials and Manufacturing Directorate, Wright-Patterson Air Force Base, Ohio, USA
Pages 250-262 | Published online: 23 May 2017
 
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ABSTRACT

Energy gain of weak signal interacting with a strong pump at the director grating in photorefractive hybrid cell is studied. The cell is filled by bent-core cholesteric LC with small twist/bend elastic constants. The director grating is written by the space-charge field penetrating into LC from the photorefractive substrate. Due to a decreased twist/bend elasticity of the LC, the grating magnitude increases causing an increase of the energy gain. Influence of the elastic constants ratio, flexoelectric coefficients, and cholesteric pitch is studied. We show that the gain coefficient can reach higher values in bent-core cholesterics compared to conventional ones.

Funding

This work has been partially supported by EOARD Grant P649.

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