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Chemical structures of CB15 and D2 used in this experiment.
(a) A formed two-dimensional (2D) grating under a polarizing optical microscope (POM) without an analyzer based on dye-doped cholesteric liquid crystal (DDCLC) cell with (sample 6) for and . Grating spacing is under the POM. (b) Corresponding 2D diffraction pattern and (c) model of undulations of layers in the 2D grating, in which and represent the polarization direction of the linearly polarized green beam and the rubbing direction of the cell, respectively.
Curves of the reflection spectrum of CLCs for sample 6 in dark (curve a) and under green beam illumination with , 440, and (curves b, c, and d, respectively) for .
Curves of the reflection spectrum of CLCs for sample 6 at 25, 29, 32.5, and (curves a, b, c, and d, respectively) without green beam illumination.
Lifetime variation of 2D grating with green beam intensity based on sample 6 (a) without and (b) with irradiation of a pumped red beam with an intensity of after the green beam is turned off.
Spacing variation of 2D grating with green beam intensity in DDCLC cells with various helical pitches.
Six fabricated dye-depoed cholesteric liquid crystal (DDCLC) samples with different concentrations (wt %) of chiral dopant in the CLC mixture. The concentration of the dye dopant in the DDCLC mixture in each cell is .
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