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• W2022644212 abstract "Noncontact optical trapping and manipulation of micrometer- and nanometer-sized particles are typically achieved by use of forces and torques exerted by tightly focused high-intensity laser beams. Although they were instrumental for many scientific breakthroughs, these approaches find few technological applications mainly because of the small-area manipulation capabilities, the need for using high laser powers, limited application to anisotropic fluids and low-refractive-index particles, as well as complexity of implementation. To overcome these limitations, recent research efforts have been directed toward extending the scope of noncontact optical control through the use of optically-guided electrokinetic forces, vortex laser beams, plasmonics, and optofluidics. Here we demonstrate manipulation of colloidal particles and self-assembled structures in nematic liquid crystals by means of single-molecule-thick, light-controlled surface monolayers. Using polarized light of intensity from 1,000 to 100,000 times smaller than that in conventional optical tweezers, we rotate, translate, localize, and assemble spherical and complex-shaped particles of various sizes and compositions. By controlling boundary conditions through the monolayer, we manipulate the liquid crystal director field and the landscape of ensuing elastic forces exerted on colloids by the host medium. This permits the centimeter-scale, massively parallel manipulation of particles and complex colloidal structures that can be dynamically controlled by changing illumination or assembled into stationary stable configurations dictated by the “memorized” optoelastic potential landscape due to the last illumination pattern. We characterize the strength of optically guided elastic forces and discuss the potential uses of this noncontact manipulation in fabrication of novel optically- and electrically-tunable composites from liquid crystals and colloids." @default.
• W2022644212 created "2016-06-24" @default.
• W2022644212 creator A5050272010 @default.
• W2022644212 creator A5050628701 @default.
• W2022644212 creator A5087000079 @default.
• W2022644212 date "2011-12-12" @default.
• W2022644212 modified "2023-10-16" @default.
• W2022644212 title "Large-area optoelastic manipulation of colloidal particles in liquid crystals using photoresponsive molecular surface monolayers" @default.
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• W2022644212 doi "https://doi.org/10.1073/pnas.1112849108" @default.
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• W2022644212 hasPublicationYear "2011" @default.
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