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Related Experiment Video

Updated: Feb 18, 2026

Construction and Operation of a Light-driven Gold Nanorod Rotary Motor System
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Optically driven ultra-stable nanomechanical rotor.

Stefan Kuhn1, Benjamin A Stickler2, Alon Kosloff3

  • 1University of Vienna, Faculty of Physics, VCQ, Boltzmanngasse 5, 1090, Vienna, Austria. stefan.kuhn@univie.ac.at.

Nature Communications
|November 23, 2017
PubMed
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Researchers developed a rotating silicon nanorod locked to a clock, achieving high frequency stability. This nanomechanical device demonstrates potential for sensitive torque and pressure measurements at room temperature.

Area of Science:

  • Physics
  • Nanotechnology
  • Mechanical Engineering

Background:

  • Nanomechanical devices are increasingly researched for sensitive physical quantity transduction.
  • Precise control of nanomechanical systems is crucial for fundamental physics experiments.

Purpose of the Study:

  • To demonstrate a rotating nanorod locked to an external clock.
  • To achieve high frequency stability in a nanomechanical rotor.
  • To explore the potential for sensitive torque and pressure measurements.

Main Methods:

  • Optically trapping a silicon nanorod and inducing rotation at MHz frequencies.
  • Locking the nanorod's motion to an external time standard.
  • Deriving and verifying stable limit cycles in the rotor's dynamics.

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  • Measuring real-time phase on the locked nanorod in a dilute gas.

    • Main Results:

    • Achieved remarkable frequency stability of 7.7 × 1011.
    • Demonstrated stable limit cycles over a wide parameter range, despite potential for chaos.
    • Showcased potential for torque measurements with sensitivity better than 0.25 zNm at room temperature.
    • Transduced pressure values with 0.3% sensitivity in real-time.

    Conclusions:

    • Optically trapped, MHz-frequency rotating nanorods can be locked to clocks, exhibiting exceptional frequency stability.
    • The robust stable limit cycles enable sensitive measurements of external torques and pressure.
    • This nanomechanical system offers a promising platform for high-precision sensing at room temperature.