Figure 2 | NPG Asia Materials

Figure 2

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

Figure 2

Defect array with concentric director fields and verifications. (a) Microdomains appeared at low frequencies (<20 Hz). These were not macroscopically discernible (inset). (b) At frequencies above 20 Hz, the microdomains merged into larger macroscopic domains, which were discernible on oblique observation. c The director fields profile: double-headed arrows denote the degenerated director fields with oppositely oriented domains. Red solid and orange open circles are +1 and −1 defects. (d and e) The director profiles around the defects were reconfirmed using an optical compensator (e) and FCPM observations (e). The red arrows denote the polarizers, and the green arrow is the direction of the quarter-wave plate. Purple ellipses are the director alignment. S811 was added for the cells used in (d–f). The dark area enclosed by four defects under the diagonally crossed polarizers. When rotating the analyzer anti-clockwise or clockwise, the contrast between the two domains inversely changed, which indicated that the two domains have opposite twist deformations.

Back to article page