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Issue 47, 2016
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Self-propelled round-trip motion of Janus particles in static line optical tweezers

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Abstract

Controlled propulsion of microparticles and micromachines in fluids could revolutionize many aspects of technology, such as biomedicine, microfluidics, micro-mechanics, optomechanics, and cell biology. We report the self-propelled cyclic round-trip motion of metallo-dielectric Janus particles in static line optical tweezers (LOT). The Janus particle is a 5 μm-diameter polystyrene sphere half-coated with 3 nanometer thick gold film. Both experiment and theory show that this cyclic translational and rotational motion is a consequence of the collective and fine action of the gold-face orientation dependent propulsion optical force, the gradient optical force, and the spontaneous symmetry breaking induced optical torque in different regions of the LOT. This study indicates a novel way to propel and manipulate the mechanical motion of microscopic motors and machines wirelessly in fluid, air, or vacuum environments using a static optical field with a smartly designed non-uniform intensity profile allowing fully controlled momentum and angular momentum exchange between light and the particle.

Graphical abstract: Self-propelled round-trip motion of Janus particles in static line optical tweezers

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Publication details

The article was received on 22 Sep 2016, accepted on 10 Nov 2016 and first published on 11 Nov 2016


Article type: Paper
DOI: 10.1039/C6NR07470G
Citation: Nanoscale, 2016,8, 19894-19900

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    Self-propelled round-trip motion of Janus particles in static line optical tweezers

    J. Liu, H. Guo and Z. Li, Nanoscale, 2016, 8, 19894
    DOI: 10.1039/C6NR07470G

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