Figure 6 | NPG Asia Materials

Figure 6

From: Standing wave-mediated molecular reorientation and spontaneous formation of tunable, concentric defect arrays in liquid crystal cells

Figure 6

Uniform defect array with spiral director profiles and optical vortex inducer. (a) Adding the R811 chiral dopant (~0.2 wt%) eliminated the microdomains, and then, the periodic uniform textures persisted without the presence of a standing wave after switching from a pulse-train signal to a normal square-wave signal (see Supplementary Video 1). A microscopic image reveals no texture (inset). (b) Director profiles around the two defects with opposite-handed spiral structures corresponding to points A and B. (c) The luminance profile of the circular, polarized laser beam became a donut shape after passing through a LC vortex (i), and the interference pattern of the donut-shape beam with another linear polarized light is a fork-shaped interference pattern with two dislocations (ii). This confirms the defect point can serve as an optical vortex inducer.

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