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Multistage optical memory of a liquid crystal diffraction grating in a single beam rewriting scheme
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View: Figures


Image of FIG. 1.
FIG. 1.

Fabrication of a binary LC grating with the optic-axis modulation angle through two processes: (a) a patterned UV light exposure to produce spatially periodic interpolymer networks in the whole bulk and (b) a single pump beam irradiation in regions 1 and 2.

Image of FIG. 2.
FIG. 2.

Microscopic textures of the optic-axis modulated LC grating under crossed polarizer after pumping at : (a) “I” and “II” denote the unpumped area and the pumped area, respectively. The textures were taken such that the rubbing direction makes angles of (b) 9° and (c) 63° with respect to the polarizer denoted by .

Image of FIG. 3.
FIG. 3.

Optical signals of the PEM from a dye-dispersed LC/polymer composite cell with interpolymer networks after subsequently pumping at or .

Image of FIG. 4.
FIG. 4.

Evolution of the first-order diffraction efficiency in time on sequentially pumping at , 90°, 45°, and 0°. The bars above the graph denote and the pumping duration. The insets represent the polarization states of the diffracted beam in two states of and for the -polarized probe beam.

Image of FIG. 5.
FIG. 5.

First-order diffraction efficiencies in two states of and as a function of the applied voltage for several polarization states (0°, , , and ) of the probe beam to the axis.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Multistage optical memory of a liquid crystal diffraction grating in a single beam rewriting scheme