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Real-time dynamic hologram in photorefractive ferroelectric liquid crystal with two-beam coupling gain coefficient of over 800 cm–1 and response time of 8 ms
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FIG. 1.

Schematic illustration of mechanism of photorefractive effect in FLCs. (a) Two laser beams interfere in SS state of FLC/photoconductive compound mixture; (b) charge generation occurs in the bright interference areas; (c) electrons are trapped at trap sites in the bright areas, while holes migrate by diffusion or drift due to the application of an external electric field, generating an internal electric field between bright and dark areas; (d) this internal electric field alters the orientation of the Ps vector (i.e., orientation of mesogens).

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FIG. 2.

Two-beam coupling experiment in (a) photochromic materials and (b) photorefractive materials. In photochromic materials, the phase of the formed refractive index grating matches that of the interference fringes so that the transmitted intensities of the laser beams are not changed. However, in photorefractive materials, the phase of the index grating is shifted relative to that of the interference fringe, causing asymmetric energy exchange.

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FIG. 3.

(a) Structures of compounds used in this study. (b) Photograph of the mixture of the base LC, 3 T-2MB (10 wt. %), and TNF (0.1 wt. %) in 10 μm gap cell observed under polarizing microscope at room temperature (SmC* phase). (c) Photograph of the sample.

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FIG. 4.

Examples of results of two-beam coupling experiments for mixtures of the base LC, 3 T-2MB (10 wt. %), and TNF (0.1 wt. %) measured at 30 °C.

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FIG. 5.

(a) Electric field dependence of gain coefficients of mixtures of base LC, 3 T-2MB, and TNF (0.1 wt. %) measured at 30 °C. 3 T-2MB concentration was in the range 2–10 wt. %. (b) Refractive index grating formation time (response time) of mixtures of base LC, 3 T-2MB, and TNF (0.1 wt. %) measured at 30 °C. 3 T-2MB concentration was in the range 2–10 wt. %.

Image of FIG. 6.

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FIG. 6.

Dynamic hologram formation experiment on a FLC sample. A computer-generated animation was displayed on the SLM. The SLM modulated the object beam (488 nm), which was irradiated on the FLC sample and interfered with the reference beam. The readout beam (633 nm) was irradiated on the FLC and diffraction was observed (enhanced online). [URL: http://dx.doi.org/10.1063/1.4792735.1]doi: 10.1063/1.4792735.1.

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/content/aip/journal/apl/102/6/10.1063/1.4792735
2013-02-14
2014-04-18

Abstract

The photorefractive effect in photoconductive ferroelectric liquid crystals (FLCs) that contain photoconductive chiral compounds was investigated. Terthiophene compounds with chiral structure were chosen as the photoconductive chiral compounds and mixed with an achiral smectic C liquid crystal. The mixture exhibited the ferroelectric chiral smectic C phase and photoconductivity. The photorefractivity of the mixture was investigated by two-beam coupling experiment. It was found that the FLC containing the photoconductive chiral compound exhibits a large gain coefficient of over 800 cm−1 and a fast response time of 8 ms. The high photorefractive performance was considered to be due to enhanced charge mobility.

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Scitation: Real-time dynamic hologram in photorefractive ferroelectric liquid crystal with two-beam coupling gain coefficient of over 800 cm–1 and response time of 8 ms
http://aip.metastore.ingenta.com/content/aip/journal/apl/102/6/10.1063/1.4792735
10.1063/1.4792735
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