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Optical trapping of colloidal particles and measurement of the defect line tension and colloidal forces in a thermotropic nematic liquid crystal
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10.1063/1.1849839
/content/aip/journal/apl/86/2/10.1063/1.1849839
http://aip.metastore.ingenta.com/content/aip/journal/apl/86/2/10.1063/1.1849839
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

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.

Image of FIG. 2.
FIG. 2.

(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 .

Image of FIG. 3.
FIG. 3.

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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/content/aip/journal/apl/86/2/10.1063/1.1849839
2005-01-05
2014-04-20
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Optical trapping of colloidal particles and measurement of the defect line tension and colloidal forces in a thermotropic nematic liquid crystal
http://aip.metastore.ingenta.com/content/aip/journal/apl/86/2/10.1063/1.1849839
10.1063/1.1849839
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