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Updated: Apr 25, 2026
High-Speed Magnetic Tweezers for Nanomechanical Measurements on Force-Sensitive Elements
Published on: May 12, 2023
Multimode laser cooling and ultra-high sensitivity force sensing with nanowires
Mahdi Hosseini1, Giovanni Guccione2, Harry J Slatyer2
11] Centre for Quantum Computation and Communication Technology, Department of Quantum Science, Research School of Physics and Engineering, The Australian National University, Canberra, Australian Capital Territory 0200, Australia [2].
We demonstrate broadband cooling of mechanical oscillators to 8 K using photo-induced forces and feedback. This method enhances signal-to-noise ratios for force measurements, improving sensitivity for applications like atomic force microscopy.
Area of Science:
- Physics
- Mechanical Engineering
- Nanotechnology
Background:
- Photo-induced forces offer a method for controlling mechanical oscillator motion.
- Active feedback is crucial for enhancing the performance of oscillators used as force sensors, particularly in atomic force microscopy.
Purpose of the Study:
- To investigate broadband multimode cooling of mechanical oscillators using photo-induced forces.
- To enhance signal-to-noise ratios for force measurements through feedback cooling.
- To achieve high-precision, fast force microscopy.
Main Methods:
- Broadband multimode cooling of oscillators was achieved using photo-induced forces.
- Periodic quiescence feedback cooling was employed to improve measurement performance.
- Real-time feedback was compared with numerical post-processing of data.
Main Results:
- Achieved broadband multimode cooling of -23 dB down to 8 ± 1 K.
- Demonstrated improved signal-to-noise ratios for transient signal measurements.
- Attained a room temperature force measurement sensitivity of <2 × 10(-16) N with <0.1 ms integration time.
Conclusions:
- Periodic quiescence feedback cooling significantly enhances signal-to-noise ratios in force measurements.
- Both real feedback and numerical post-processing yield similar improvements.
- The developed high-precision, fast force microscopy technique has broad applicability in biosensing, molecular metrology, and subsurface imaging.
