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Related Concept Videos

Overview of Microscopy Techniques01:22

Overview of Microscopy Techniques

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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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Scanning Electron Microscopy01:07

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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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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,...
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Three-Dimensional Microscopy in Microbiology01:28

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Three-dimensional imaging techniques are essential in cell biology, allowing researchers to visualize intricate cellular structures with high resolution. Two prominent methods, Differential Interference Contrast Microscopy (DIC) and Confocal Scanning Laser Microscopy (CSLM), provide distinct advantages for imaging live and thick specimens, respectively.Differential Interference Contrast MicroscopyDIC microscopy enhances contrast in transparent, unstained samples by converting phase...
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Overview of Electron Microscopy01:25

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The wavelengths of visible light ultimately limit the maximum theoretical resolution of images created by light microscopes. Most light microscopes can only magnify 1000X, and a few can magnify up to 1500X. Electrons, like electromagnetic radiation, can behave like waves, but with wavelengths of 0.005 nm, they produce significantly greater resolution up to 0.05 nm as compared to 500 nm for visible light. An electron microscope (EM) can create a sharp image that is magnified up to 2,000,000X.
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Phase-Contrast Microscopes
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Video-rate Scanning Confocal Microscopy and Microendoscopy
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Video-rate Scanning Confocal Microscopy and Microendoscopy

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A scanning cavity microscope.

Matthias Mader1,2, Jakob Reichel3, Theodor W Hänsch1,2

  • 1Ludwig-Maximilians-Universität München, Fakultät für Physik, Schellingstraße 4, 80799 München, Germany.

Nature Communications
|June 25, 2015
PubMed
Summary
This summary is machine-generated.

This study introduces ultra-sensitive imaging for nanosystems by enhancing optical signals within a microcavity. This technique achieves significant signal amplification, enabling detailed observation of minute optical properties beyond fluorescence.

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Area of Science:

  • Nanophotonics
  • Optical Microscopy
  • Materials Science

Background:

  • Imaging optical properties of nanosystems beyond fluorescence is crucial but challenging due to weak signals.
  • Specialized techniques with sophisticated noise rejection are typically required for absorption and dispersion measurements.

Purpose of the Study:

  • To develop an ultra-sensitive imaging method for nanosystems using signal enhancement in a scanning optical microcavity.
  • To demonstrate quantitative imaging of optical properties with improved sensitivity and spatial resolution.

Main Methods:

  • Utilizing a high-finesse scanning optical microcavity to harness multiple interactions of probe light with the sample.
  • Achieving significant signal enhancement (1,700-fold) compared to diffraction-limited microscopy.

Main Results:

  • Demonstrated quantitative imaging of gold nanoparticle extinction cross-section with sub-nanometer squared sensitivity.
  • Showcased potential for sub-diffraction limit spatial resolution using higher-order cavity modes.
  • Presented measurements of gold nanorod birefringence and extinction contrast.

Conclusions:

  • The developed method offers ultra-sensitive imaging of optical properties for nanomaterials, molecules, and biological nanosystems.
  • Simultaneous enhancement of absorptive and dispersive signals opens new avenues for optical studies at the nanoscale.