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Trapping force vs (a) laser power and (b) depth of trapping in liquid crystals ZLI2806 and as compared to water. The inset in (a) shows a structure of particles in form of the letters “LC” assembled in the bulk of a liquid-crystal cell; the white bar on the inset indicates the rubbing direction at the plates of the nematic cell.
(Color) Manipulation of a disclination and measurement of its line tension: (a-c) stretching the disclination in the nematic ZLI2806 with an optically trapped MR bead; (d) force-line tensions balance; (e) vertical FCPM cross section with the colocalized fluorescent signal from BTBP-doped LC (grayscale) and Rhodamine B labeled particle (green); (f) schematic drawing of director field with the bead in the vicinity of a disclination. In (e) the polarization of the FCPM probing light is marked by “P” and a white bar, the BTBP dye in the LC was excited with a Ar laser and the fluorescent light was detected in the spectral region ; the Rhodamine B dye incorporated in MR microspheres was excited using the Kr laser and the respective fluorescence signal was detected in the spectral range .
Colloidal attraction force between the polymer particles with perpendicular anchoring (treated with lecithin) in a planar nematic ZLI2806 cell as a function of the interparticle distance. The solid lines are the best fits to the experimental data (circles).
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