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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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Related Experiment Video

Updated: May 3, 2026

Demonstration of a Hyperlens-integrated Microscope and Super-resolution Imaging
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Wide-spectrum zoom electrowetting liquid lens with a centimeter aperture.

Xiao-Ke Lu, Rong-Qiang Li, Yu-Cheng Lin

    Optics Letters
    |May 1, 2026
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    Summary

    Ionic liquids offer superior thermal stability and near-infrared transmittance for electrowetting liquid lenses. This study introduces a new formulation, EFN series, achieving over 92% transmittance and a 13.93 m⁻¹ zoom range.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Electrochemistry

    Background:

    • Traditional aqueous electrowetting systems suffer from poor thermal stability, electrode corrosion, and limited near-infrared (NIR) transmittance.
    • Ionic liquids present a promising alternative due to their inherent stability and broad spectral transmittance.

    Purpose of the Study:

    • To develop and evaluate a novel ionic liquid formulation for electrowetting liquid lenses.
    • To enhance near-infrared transmittance and overall performance of liquid lenses for adaptive optics.

    Main Methods:

    • A new ionic liquid formulation, the EFN series, was synthesized and characterized.
    • A 10-mm caliber electrowetting liquid lens was fabricated using the EFN series formulation.
    • Optical transmittance, response time, and zoom range were measured under varying applied voltages (0-70 V).

    Main Results:

    • The EFN series formulation demonstrated a transmittance exceeding 92% across a wide spectrum.
    • The resulting liquid lens achieved a maximum zoom range of 13.93 m⁻¹.
    • A rapid response time of approximately 100 milliseconds was recorded, with clear imaging capabilities.

    Conclusions:

    • The developed ionic liquid formulation significantly overcomes the limitations of traditional aqueous systems.
    • The wide-band zoom electrowetting liquid lens exhibits excellent performance, meeting demands for real-time adaptive regulation.
    • Ionic liquids are a viable and advantageous medium for advanced liquid lens applications.