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An Optically Driven Bistable Janus Rotor with Patterned Metal Coatings.

Yiwu Zong1, Jing Liu2, Rui Liu1

  • 1Beijing National Laboratory for Condensed Matter Physics and Key Laboratory of Soft Matter Physics, Institute of Physics, Chinese Academy of Sciences , Beijing 100190, China.

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|October 21, 2015
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Summary

Janus particles exhibit bistable rotation in an optical trap, enabling controlled direction and speed. This breakthrough offers a simple method for creating functional nano- and micro-scale rotary motors.

Keywords:
Janus particlescontrolled rotationmicrorotoroptical trapsspontaneous symmetry breaking

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Area of Science:

  • Physics, Nanotechnology, Materials Science

Background:

  • Janus particles, with distinct surface properties, are crucial for micro- and nanodevices.
  • Controlling particle rotation is essential for developing micro- and nanomachinery.

Purpose of the Study:

  • To realize and control bistable rotation in gold-coated Janus colloidal particles using an infrared optical trap.
  • To investigate the underlying physical mechanisms driving the observed rotational behavior.
  • To establish a method for fabricating functional rotary motors for nano- and microdevices.

Main Methods:

  • Fabrication of gold-coated Janus particles via sputtering gold onto polystyrene monolayers.
  • Utilizing an infrared optical trap to confine and manipulate the Janus particles.
  • Experimental observation and control of particle rotation, including direction and rate.
  • Numerical calculations to analyze the symmetry breaking and rotational dynamics.

Main Results:

  • Achieved stable, bistable rotation of gold-coated Janus particles in an optical trap.
  • Demonstrated experimental control over both the direction and rate of particle rotation.
  • Identified spontaneous symmetry breaking due to uneven coating curvature as the cause of bistable rotation.

Conclusions:

  • Bistable rotation in Janus particles can be reliably achieved and controlled.
  • The findings provide a straightforward approach for large-scale production of functional rotary motors.
  • This work paves the way for advanced nano- and micro-electromechanical systems.