Abstract
Alternating current (ac) electric-field-induced microstructures and electrohydrodynamic convection properties were studied for a guest-host liquid crystal (LC) system. The LC (MBBA) was doped with a newly synthesized azo-dye and filled in a LC cell. When the applied ac electric-field voltage was fixed at 13.5 V (Vrms), microstructures in the LC cell varied with the frequency (f) of the electric field. The probed He-Ne laser light displayed a hexagonal diffracted pattern when f=4.3 Hz, a square symmetry pattern when f=17.38 Hz, and a new hexagonal symmetry pattern when f=34.07 Hz. The first-order diffraction intensities along the x-axis direction (I1−x(t)) and y-axis direction (I1−y(t)) showed different time evolution tendency. At the same time, the phase shift (φ) between I1−x(t) and second-order diffraction intensity I2−x(t) was found to be dependent on the frequency.
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