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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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A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
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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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Related Experiment Video

Updated: May 1, 2026

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
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A sample scanning system with nanometric accuracy for quantitative SPM measurements.

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This study introduces a high-precision sample scanning device for scanning probe microscopy. The device achieves nanometer accuracy for both lateral and vertical displacements, enabling accurate step-height measurements.

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Area of Science:

  • Metrology
  • Nanotechnology
  • Scanning Probe Microscopy

Background:

  • Accurate displacement control is crucial for high-resolution imaging in scanning probe microscopy.
  • Existing systems face limitations in achieving both speed and nanometer-level precision.

Purpose of the Study:

  • To develop and characterize a novel sample scanning device with enhanced accuracy and bandwidth.
  • To enable precise measurements of micrometric patterned surfaces.

Main Methods:

  • Utilized interferometer and capacitance-based displacement controls for xy and z stages.
  • Employed piezo flexure actuators and bimorph plates for precise stage movement.
  • Integrated fast phase-meters and capacitive sensors for real-time feedback.

Main Results:

  • Achieved lateral displacement accuracy of 3 nm + 1 x 10(-3) L with a 200 Hz bandwidth.
  • Attained vertical displacement accuracy of 2 nm + 2 x 10(-3) h with a 1 kHz bandwidth.
  • Demonstrated accurate imaging and pitch measurements of e-beam lithography patterned surfaces.

Conclusions:

  • The developed scanning device offers superior accuracy and speed for nanoscale metrology.
  • The device is suitable for high-resolution imaging and precise dimensional analysis in scanning probe microscopy.
  • Results show good agreement with optical diffractometry, validating the device's performance.