We demonstrate optical trapping and manipulation of transparent microparticles suspended in a thermotropic nematic liquid crystal with low birefringence. We employ the particle manipulation to measure line tension of a topologically stable disclination line and to determine colloidal interaction of particles with perpendicular surface anchoring of the director. The three-dimensional director fields and positions of the particles manipulated by laser tweezers are visualized by fluorescence confocal polarizing microscopy.
Applied Physics Letters
Copyright 2005 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Appl. Phys. Lett. 86, 021913 (2005) and may be found at http://dx.doi.org/10.1063/1.1849839.
Smalyukh, Ivan I.; Kuzmin, A. N.; Kachynski, A. V.; Prasad, P. N.; Lavrentovich, Oleg (2005). Optical Trapping of Colloidal Particles and Measurement of the Defect Line Tension and Colloidal Forces in a Thermotropic Nematic Liquid Crystal. Applied Physics Letters 86(2) doi: 10.1063/1.1849839. Retrieved from https://oaks.kent.edu/cpippubs/104