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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...
Atomic Force Microscopy01:08

Atomic Force Microscopy

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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Imaging Biological Samples with Optical Microscopy01:18

Imaging Biological Samples with Optical Microscopy

Optical microscopy uses optic principles to provide detailed images of samples. Antonie van Leeuwenhoek designed the first compound optical microscope in the 17th century to visualize blood cells, bacteria, and yeast cells. In 1830, Joseph Jackson Lister created an essentially modern light microscope. The 20th century saw the development of microscopes with enhanced magnification and resolution.
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Confocal Fluorescence Microscopy01:16

Confocal Fluorescence Microscopy

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,...
Scanning Electron Microscopy01:07

Scanning Electron Microscopy

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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Updated: Jul 2, 2026

Microscopic Visualization of Porous Nanographenes Synthesized through a Combination of Solution and On-Surface Chemistry
08:18

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Published on: March 4, 2021

Through-focus scanning-optical-microscope imaging method for nanoscale dimensional analysis.

Ravikiran Attota1, Thomas A Germer, Richard M Silver

  • 1National Institute of Standards and Technology, Gaithersburg, MD 20899, USA. ravikiran.attota@nist.gov

Optics Letters
|September 2, 2008
PubMed
Summary
This summary is machine-generated.

A new optical microscopy method achieves nanometer measurement sensitivity. This technique analyzes scanning images to determine dimensions of nanosized targets for applications in nanometrology and manufacturing.

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Area of Science:

  • Optics and Photonics
  • Nanotechnology
  • Metrology

Background:

  • Accurate dimensional measurement of nanoscale objects is crucial for advanced manufacturing and scientific research.
  • Conventional optical microscopy often lacks the resolution required for precise nanometer-scale measurements.
  • Existing techniques for nanometrology can be complex or require specialized equipment.

Purpose of the Study:

  • To introduce a novel optical technique for achieving nanometer dimensional measurement sensitivity.
  • To demonstrate the capability of identifying changing dimensions between nanosized targets.
  • To enable precise dimensional determination of nanoscale targets using a library-matching approach.

Main Methods:

  • Utilizing a conventional bright-field optical microscope.
  • Acquiring through-focus scanning-optical-microscope images at various focus positions.
  • Analyzing image data to extract dimensional information through library matching.

Main Results:

  • Achieved nanometer dimensional measurement sensitivity with a standard optical microscope.
  • Demonstrated the ability to differentiate and quantify dimensional changes in nanosized targets.
  • Validated the potential for broad applicability across different target geometries.

Conclusions:

  • The developed optical technique offers a cost-effective and accessible method for high-sensitivity nanometrology.
  • This approach has significant potential for applications in nanomanufacturing, semiconductor process control, and biotechnology.
  • The library-matching methodology enhances the precision and reliability of nanoscale dimensional analysis.