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Schematic of the experimental setup for investigating optically switchable biphotonic gratings (BGs) in dye-doped cholesteric liquid crystal (DDCLC) films; : green beam; : red pump beams; : probe beam; , : polarizers; : quarter waveplate for .
(a) Optical switching feature of the first-order diffraction beam from the BG and (b) the diffraction pattern of the probed red beam from a stable BG based on a DDCLC cell.
Dynamics of transmitted intensity of a probe beam when an analyzer A (crossed with ) is inserted behind the cell during excitation of green beam with four intensities and a pumped red beam with an intensity of . The inset figure plots the variation of angle of rotation of the polarization of the probe beam due to the optical activity of the DDCLC cell with the green-beam intensity.
Absorption spectrum of a D2-doped CLC cell in the dark (black line) and in the irradiation of with intensity of for (gray line).
Variation of the first-order diffraction efficiency of a probe beam with relative intensity of green and red beams.
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