Unconventional structure-assisted optical manipulation of high-index nanowires in liquid crystals
Journal article, 2012

Stable optical trapping and manipulation of high-index particles in low-index host media is often impossible due to the dominance of scattering forces over gradient forces. Here we explore optical manipulation in liquid crystalline structured hosts and show that robust optical manipulation of high-index particles, such as GaN nanowires, is enabled by laser-induced distortions in long-range molecular alignment, via coupling of translational and rotational motions due to helicoidal molecular arrangement, or due to elastic repulsive interactions with confining substrates. Anisotropy of the viscoelastic liquid crystal medium and particle shape give rise to a number of robust unconventional trapping capabilities, which we use to characterize defect structures and study rheological properties of various thermotropic liquid crystals.

Three-dimensional microscopy

Liquid crystals


Laser trapping


David Engström

University of Gothenburg

Michael C. M. Varney

Martin Persson

University of Gothenburg

Rahul P. Trivedi

Kris A. Bertness

Mattias Goksör

University of Gothenburg

Ivan I. Smalyukh

Optics Express

Vol. 20 7 7741-7748

Subject Categories

Atom and Molecular Physics and Optics

Other Materials Engineering

Condensed Matter Physics



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