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Related Concept Videos

Atomic Force Microscopy01:08

Atomic Force Microscopy

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Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
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Overview of Microscopy Techniques01:22

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The early pioneers of microscopy opened a window into the invisible world of microorganisms. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes that leveraged nonvisible light, such as fluorescence microscopy that uses an ultraviolet light source and electron microscopy that uses short-wavelength electron beams. These advances significantly improved magnification, image resolution, and contrast. By comparison, the...
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Updated: Sep 28, 2025

Author Spotlight: Introduction to Active Probe Atomic Force Microscopy with Quattro-Parallel Cantilever Arrays
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Very-high-frequency probes for atomic force microscopy with silicon optomechanics.

L Schwab1, P E Allain2, N Mauran1

  • 1Laboratoire d'Analyse et d'Architecture des Systèmes, Université de Toulouse, CNRS UPR 8001, 31031 Toulouse, France.

Microsystems & Nanoengineering
|April 4, 2022
PubMed
Summary

Researchers developed a novel optomechanical sensor for Atomic Force Microscopy (AFM) operating at ultra-high frequencies. This advancement enables force measurements at unprecedented timescales, opening new avenues in nanoscience and nanotechnology research.

Keywords:
Electrical and electronic engineeringNEMSSensors

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Area of Science:

  • Nanoscience and Nanotechnology
  • Physics
  • Engineering

Background:

  • Atomic Force Microscopy (AFM) is crucial for nanosciences, enabling nanoscale force measurements.
  • Existing AFM probes operate at frequencies significantly lower than 100 MHz.
  • Cavity optomechanics and micro/nanoelectromechanical systems offer potential for enhanced AFM capabilities.

Purpose of the Study:

  • To fabricate a novel sensor for dynamic mode AFM operating above 100 MHz.
  • To achieve force measurements at unexplored timescales.
  • To demonstrate AFM force-distance measurements with enhanced sensitivity and stability.

Main Methods:

  • Fabrication of an optomechanical sensor using very-large-scale integration (VLSI) and photonic silicon circuits.
  • Coupling an optomechanical ring cavity to a 1.55 μm laser.
  • Utilizing a 130 MHz mechanical resonance mode with a quality factor of 900 in air.

Main Results:

  • Achieved a displacement detection limit of 3 × 10⁻¹⁶ m/√Hz.
  • Enabled detection of Brownian motion and picometer-range vibration amplitudes.
  • Demonstrated stable closed-loop AFM operation with a 4 nN/nm setpoint and subpicometer amplitude.

Conclusions:

  • The developed optomechanical sensor significantly surpasses commercial AFM probe frequencies.
  • The sensor facilitates force sensing at unprecedented timescales and with high sensitivity.
  • This technology paves the way for new AFM applications requiring picometer-level precision and dynamic measurements.