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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...
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...
Two-Dimensional Microscopy in Microbiology01:29

Two-Dimensional Microscopy in Microbiology

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...
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...
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...
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,...

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Updated: Jun 22, 2026

Microfabrication of Implantable Optics Integrated in a Microstructured Imaging Window for Advanced In Vivo Imaging
07:14

Microfabrication of Implantable Optics Integrated in a Microstructured Imaging Window for Advanced In Vivo Imaging

Published on: April 11, 2025

Cooperative microlenses.

L Helseth, T Fischer

    Optics Express
    |June 2, 2009
    PubMed
    Summary
    This summary is machine-generated.

    Microspheres function as microscopic lenses, with their movement causing intensity fluctuations. These fluctuations reveal interactions in superparamagnetic sphere chains and networks, offering insights into colloidal systems.

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    Lensfree On-chip Tomographic Microscopy Employing Multi-angle Illumination and Pixel Super-resolution

    Published on: August 16, 2012

    Area of Science:

    • Physics
    • Materials Science
    • Colloidal Science

    Background:

    • Microspheres can exhibit lensing properties.
    • Brownian motion influences optical characteristics of microscopic systems.
    • Interactions between colloidal particles affect their collective behavior.

    Purpose of the Study:

    • To investigate microspheres as microscopic lenses.
    • To analyze intensity fluctuations caused by Brownian motion and particle interactions.
    • To explore how magnetic fields and particle arrangement influence these optical phenomena.

    Main Methods:

    • Utilizing superparamagnetic spheres.
    • Assembling spheres into pearl chains using magnetic fields.
    • Forming two-dimensional colloidal crystals.
    • Analyzing characteristic intensity fluctuations.

    Main Results:

    • Observed that microspheres act as microscopic lenses.
    • Demonstrated that Brownian motion leads to abrupt focal point changes and intensity fluctuations.
    • Found that intensity fluctuations in pearl chains correlate with chain stiffness.
    • Showed that in 2D colloidal crystals, fluctuations are restricted, and temporal network structures emerge.

    Conclusions:

    • Microsphere lensing is modulated by Brownian motion and inter-particle interactions.
    • Magnetic field-induced assembly offers a method to control optical properties.
    • The study provides a novel approach to probe colloidal interactions and dynamics through optical fluctuations.