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Related Concept Videos

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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Phase-Contrast Microscopes
In-phase-contrast microscopes, interference between light directly passing through a cell and light refracted by cellular components is used to create high-contrast, high-resolution images without staining. It is the oldest and simplest type of microscope that creates an image by altering the wavelengths of light rays passing through the specimen. Altered wavelength paths are created using an annular stop in the condenser. The annular stop produces a hollow cone of...
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Two-dimensional (2D) microscopy encompasses a range of optical techniques that capture images within a single focal plane, offering detailed representations of microscopic structures. These techniques are essential in biological and medical research, enabling the visualization of cellular and subcellular structures with different levels of contrast and specificity.There are several major types of 2D microscopy, each with strengths and applications.Bright-Field MicroscopyBright-field microscopy...
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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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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,...
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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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Quantitative Optical Microscopy: Measurement of Cellular Biophysical Features with a Standard Optical Microscope
14:09

Quantitative Optical Microscopy: Measurement of Cellular Biophysical Features with a Standard Optical Microscope

Published on: April 7, 2014

Optical contrast in apertureless microscopy.

J Azoulay1, A Débarre, A Richard

  • 1Laboratoire Aimé Cotton, Centre National de la Recherche Scientifique, Bâtiment 505, 91405 Orsay Cedex, France.

Applied Optics
|March 14, 2008
PubMed
Summary
This summary is machine-generated.

This study reveals that optical image contrast in apertureless near-field optical microscopy primarily stems from sample topography. Adjusting the reference field phase can decouple the optical image from topographical influences.

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Area of Science:

  • Optical microscopy
  • Nanotechnology
  • Surface science

Background:

  • Apertureless near-field optical microscopy (aNOM) offers high-resolution surface imaging.
  • Understanding image contrast mechanisms in aNOM is crucial for accurate interpretation.
  • Sample topography often influences optical signals in near-field techniques.

Purpose of the Study:

  • To investigate the origins of optical image contrast in a specific aNOM.
  • To analyze the coupling mechanism responsible for image formation.
  • To explore methods for separating optical signals from topographical artifacts.

Main Methods:

  • Utilized a specific apertureless near-field optical microscope.
  • Analyzed the optical image contrast generated from various samples.
  • Investigated the role of the coupling mechanism and interferometer-like behavior.
  • Experimentally controlled the phase of the reference field.

Main Results:

  • Demonstrated that sample topography is the dominant factor in optical image contrast.
  • Showed that the aNOM functions as an interferometer sensitive to near-field components.
  • Identified that the reference field in the basic configuration is coupled to topography.
  • Successfully decorrelated the optical image from topography by controlling the reference field phase.

Conclusions:

  • Optical image contrast in this aNOM is largely dictated by surface topography.
  • The microscope's interferometer-like nature is sensitive to near-field interactions.
  • Phase control of the reference field offers a method to enhance optical information distinct from topography.