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Related Concept Videos

Overview of Microscopy Techniques01:22

Overview of Microscopy Techniques

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...
Confocal Fluorescence Microscopy01:16

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Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...
Electron Microscope Tomography and Single-particle Reconstruction01:07

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Transmission electron microscopy (TEM) can be used to determine the 3D structure of biological samples with the help of techniques such as electron microscope tomography and single-particle reconstruction. While single-particle reconstruction can examine macromolecules and macromolecular complexes in vitro conditions only, tomography permits the study of cell components or small cells in vivo.
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Atomic Force Microscopy01:08

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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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Super-resolution Fluorescence Microscopy01:37

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Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.

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Active Probe Atomic Force Microscopy with Quattro-Parallel Cantilever Arrays for High-Throughput Large-Scale Sample Inspection
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High-speed multiresolution scanning probe microscopy based on Lissajous scan trajectories.

Tomas Tuma1, John Lygeros, V Kartik

  • 1IBM Research-Zurich, Säumerstrasse 4, 8803 Rüschlikon, Switzerland. uma@zurich.ibm.com

Nanotechnology
|April 21, 2012
PubMed
Summary

High-speed scanning probe microscopy utilizes a novel Lissajous scan trajectory for faster imaging. This method enables rapid multiresolution imaging and real-time atomic force microscopy (AFM) at 1 frame per second.

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Area of Science:

  • Scanning Probe Microscopy
  • Nanotechnology
  • Surface Science

Background:

  • Traditional scanning probe microscopy methods face limitations in imaging speed.
  • Excitation of unwanted resonant modes and increased sensitivity to measurement noise hinder high-speed operation.

Purpose of the Study:

  • To introduce a novel two-dimensional Lissajous scan trajectory for high-speed scanning probe microscopy.
  • To demonstrate the capability for rapid multiresolution imaging and real-time atomic force microscopy (AFM).

Main Methods:

  • Generating a Lissajous pattern by actuating the scanner with two single-tone harmonic waveforms.
  • Tuning spatial and temporal resolution of Lissajous trajectories.
  • Experimental validation using a custom-built atomic force microscope (AFM).

Main Results:

  • Achieved high imaging speeds due to the narrow frequency spectrum of the Lissajous trajectory.
  • Avoided excitation of unwanted scanner resonant modes and minimized feedback loop sensitivity to noise.
  • Demonstrated real-time AFM imaging with a frame rate of 1 frame s⁻¹.

Conclusions:

  • The Lissajous scan trajectory offers a significant advancement for high-speed scanning probe microscopy.
  • This approach enables efficient multiresolution imaging and real-time nanoscale surface analysis.
  • The method provides a pathway for faster and more sensitive atomic force microscopy applications.