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Wideband phase-locked loop circuit with real-time phase correction for frequency modulation atomic force microscopy.

Takeshi Fukuma1, Shunsuke Yoshioka, Hitoshi Asakawa

  • 1Frontier Science Organization, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan. fukuma@staff.kanazawa-u.ac.jp

The Review of Scientific Instruments
|August 3, 2011
PubMed
Summary
This summary is machine-generated.

We developed a wideband phase-locked loop (PLL) circuit for real-time phase correction in liquid. This enhances high-speed, accurate force measurements using frequency modulation atomic force microscopy (FM-AFM).

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Area of Science:

  • Atomic Force Microscopy
  • Nanotechnology
  • Physical Chemistry

Background:

  • High-speed frequency modulation atomic force microscopy (FM-AFM) in liquid requires high-frequency cantilevers.
  • High-frequency cantilevers introduce significant frequency-dependent phase delays, impacting measurement accuracy, especially at low Q factors.
  • Existing methods struggle to compensate for these phase delays in real-time.

Purpose of the Study:

  • To develop a wideband phase-locked loop (PLL) circuit for real-time phase correction in FM-AFM.
  • To enable high-speed and accurate force measurements in liquid environments.
  • To overcome limitations imposed by signal delay in cantilever excitation loops.

Main Methods:

  • Development of a wideband phase-locked loop (PLL) circuit.
  • Integration of a subtraction-based phase comparator within the PLL.
  • Real-time compensation of frequency-dependent phase delays.
  • Application to three-dimensional force measurements at a mica/water interface.

Main Results:

  • Successful implementation of a wideband PLL with real-time phase correction capabilities.
  • Demonstrated significant improvement in the accuracy of high-speed force measurements.
  • Validated the method's effectiveness in a liquid environment (mica/water interface).

Conclusions:

  • The developed wideband PLL effectively compensates for phase delays in FM-AFM.
  • This technology enables accurate and high-speed force measurements in liquid.
  • The method holds promise for advanced nanoscale characterization in biological and chemical applications.