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Related Concept Videos

Total Internal Reflection Fluorescence Microscopy01:05

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Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.
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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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Temperature-calibrated high-precision refractometer using a tilted fiber Bragg grating.

Biqiang Jiang, Kaiming Zhou, Changle Wang

    Optics Express
    |October 19, 2017
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel refractometer using tilted fiber Bragg gratings (TFBGs) for precise refractive index (RI) measurements. The TFBG-based vernier refractometer achieves high accuracy and temperature self-calibration for liquids.

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    Area of Science:

    • Photonics and optical sensing
    • Materials science
    • Analytical chemistry

    Background:

    • Refractive index (RI) is a critical parameter for characterizing liquids.
    • Existing refractometry methods face limitations in precision and resolution.
    • Fiber Bragg gratings (FBGs) offer potential for high-sensitivity optical sensing.

    Purpose of the Study:

    • To develop a high-precision refractometer utilizing tilted fiber Bragg gratings (TFBGs).
    • To enhance RI measurement accuracy by employing a vernier scale approach.
    • To demonstrate the refractometer's performance through experimental verification.

    Main Methods:

    • Utilizing the fine spectrum structure of TFBGs to determine absolute RI values.
    • Employing cut-off mode resonances for accurate wavelength determination.
    • Calibrating main- and vernier-scales using extensive spectral data across various RI ranges.

    Main Results:

    • Achieved high precision in RI measurements, with accuracy on the order of 10-4.
    • Demonstrated high repeatability and reliability of the TFBG-based vernier refractometer.
    • Verified temperature self-calibration capability through experiments with anhydrous ethanol.

    Conclusions:

    • The TFBG-based vernier refractometer provides a significant advancement in liquid RI measurement.
    • The vernier scale effectively reduces uncertainty arising from discrete cladding mode resonances.
    • The developed refractometer shows promise for applications requiring precise RI determination and temperature monitoring.