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Videos de Conceptos Relacionados

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

Three-Dimensional Microscopy in Microbiology

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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Optical Scatter Microscopy Based on Two-Dimensional Gabor Filters
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Microscopía interferométrica de barrido sin abertura: imágenes ópticas con una resolución de 10 angstroms.

F Zenhausern, Y Martin, H K Wickramasinghe

    Science (New York, N.Y.)
    |August 25, 1995
    PubMed
    Resumen

    La microscopía óptica de campo cercano ahora logra una resolución de 10 angstroms utilizando interferometría. Esta técnica mide los campos eléctricos dispersos a través de las vibraciones de la punta de la sonda, lo que permite una imagen a nanoescala sin precedentes.

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    Área de la Ciencia:

    • Física Física es la física de las cosas.
    • Nanotecnología La nanotecnología es la nanotecnología.
    • Microscopía óptica y microscopía óptica.

    Sus antecedentes:

    • La microscopía óptica convencional de campo cercano se basa en las interacciones de polarizabilidad de la muestra de dipolo.
    • Lograr una resolución subnanométrica en la microscopía óptica ha sido un desafío de larga data.

    Objetivo del estudio:

    • Para demostrar una nueva técnica de microscopía óptica de campo cercano interferométrica.
    • Para lograr una resolución sin precedentes de 10 angstroms.

    Principales métodos:

    • Utilizando un interferómetro para medir las variaciones de campo eléctrico disperso.
    • Codificando estas variaciones como modulación de fase óptica utilizando una punta de sonda vibratoria.
    • Empleando un nuevo mecanismo de contraste basado en el acoplamiento dipolo-dipolo modulado.

    Principales resultados:

    • Microscopía óptica de campo cercano interferométrica demostrada con una resolución de 10 angstroms.
    • Se midieron con éxito las variaciones dispersas del campo eléctrico a través de la modulación óptica de fase.
    • Validación de un nuevo mecanismo de contraste basado en la detección de acoplamiento dipolo-dipolo modulado.

    Conclusiones:

    • La microscopía óptica de campo cercano interferométrica ofrece un camino hacia la obtención de imágenes de ultra-alta resolución.
    • La técnica demostrada supera las limitaciones de los métodos tradicionales de campo cercano.
    • Este avance tiene implicaciones significativas para el análisis de superficies a nanoescala.