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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.
In optical microscopy, the specimen to be viewed is placed on a glass slide and clipped on the stage...
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.
Fundamental Principles
Accelerated...
Overview of Electron Microscopy01:25

Overview of Electron Microscopy

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.
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...
Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

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.
Phase Contrast and Differential Interference Contrast Microscopy01:26

Phase Contrast and Differential Interference Contrast Microscopy

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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Related Experiment Video

Updated: Jun 19, 2026

High-Throughput Total Internal Reflection Fluorescence and Direct Stochastic Optical Reconstruction Microscopy Using a Photonic Chip
14:09

High-Throughput Total Internal Reflection Fluorescence and Direct Stochastic Optical Reconstruction Microscopy Using a Photonic Chip

Published on: November 16, 2019

Microscope imaging through highly scattering media.

G E Anderson, F Liu, R R Alfano

    Optics Letters
    |October 22, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Spatial filtering and early photon detection significantly enhance microscopic imaging through scattering media. This technique improves image quality by isolating useful light signals, overcoming scattering challenges for clearer visualization.

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    Area of Science:

    • Optics
    • Microscopy
    • Photonics

    Background:

    • Imaging through scattering media is challenging due to light diffusion.
    • Traditional microscopy techniques struggle to resolve details in turbid samples.
    • Developing methods to improve image clarity in scattering environments is crucial for scientific advancement.

    Purpose of the Study:

    • To improve the quality of microscopic images obtained through highly scattering media.
    • To investigate the combined effect of spatial filtering and time-resolved detection on image enhancement.

    Main Methods:

    • Utilized a spatial filter at the back Fourier-transform plane of a microscope's objective lens.
    • Employed time-resolved detection to isolate early-arriving photons.
    • Applied these techniques to image a test chart obscured by a scattering medium.

    Main Results:

    • Incorporation of a spatial filter significantly improved microscopic image quality.
    • Further enhancement was achieved by combining spatial filtering with time-resolved detection of early photons.
    • The results demonstrate a clear improvement in resolving the hidden test chart.

    Conclusions:

    • Spatial filtering is an effective method for enhancing microscopic imaging through scattering materials.
    • Time-resolved detection of early photons, coupled with spatial filtering, offers superior image quality.
    • This approach provides a robust solution for visualizing structures within turbid samples.