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Imaging Biological Samples with Optical Microscopy01:18

Imaging Biological Samples with Optical Microscopy

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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...
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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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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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Related Experiment Video

Updated: Mar 19, 2026

Author Spotlight: Unveiling the Potential of VSFG Microscopy in Studying Mesoscopically Heterogeneous Self-Assembled Structures
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Design method of a modular side-view objective compatible with existing photographic objectives.

Yuefan Shan, Ximeng Wang, Yesheng Wang

    Applied Optics
    |March 17, 2026
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    Summary

    This study introduces a novel side-view camera objective for tablets, enhancing real-time paper surface imaging during writing and drawing. The design minimizes distortion and improves resolution, enabling cost-effective, large-scale production.

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    Area of Science:

    • Optics
    • Imaging Systems
    • Mobile Device Technology

    Background:

    • Mobile devices are primary cameras, but imaging planar surfaces like paper presents challenges.
    • Existing side-view imaging methods suffer from trapezoidal distortion and reduced distal resolution.
    • Current solutions often block user view or restrict motion.

    Purpose of the Study:

    • To develop a cost-effective, modular side-view objective for tablet cameras.
    • To overcome limitations of traditional side-view imaging, specifically trapezoidal distortion and resolution.
    • To enable real-time, high-quality imaging of paper surfaces during planar operations.

    Main Methods:

    • Theoretical analysis of pupil aberrations and introduction of field angle constraints.
    • Utilizing a freeform mirror to create a relay pupil, reducing aberrations and stray light.
    • Employing an iterative design method with light-footprint geometry to correct exit pupil aberrations.

    Main Results:

    • Achieved a modulation transfer function > 0.25 at 100 cycles/mm.
    • Effectively controlled trapezoidal distortion and suppressed stray light.
    • Demonstrated compatibility with tablet cameras and good manufacturability.

    Conclusions:

    • The proposed side-view objective offers a cost-effective solution for high-quality paper surface imaging with tablets.
    • The design successfully minimizes optical aberrations, enhancing image resolution and geometric accuracy.
    • This technology has potential for large-scale production in applications requiring real-time document capture.