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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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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
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Related Experiment Video

Updated: Mar 18, 2026

Nanotopology of Cell Adhesion upon Variable-Angle Total Internal Reflection Fluorescence Microscopy VA-TIRFM
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Angle-invariant imaging using a total internal reflection virtual aperture.

Ilya P Agurok, Joseph E Ford

    Applied Optics
    |July 14, 2016
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel virtual aperture using total internal reflection (TIR) for wide-angle imaging. This TIR lens design significantly improves light collection and resolution compared to conventional lenses.

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    Area of Science:

    • Optical engineering
    • Imaging systems
    • Photonics

    Background:

    • Conventional lens stops cause angle-dependent light loss and reduced resolution.
    • Retro-telephoto lenses offer uniform response but suffer from low wide-angle resolution and large volume.

    Purpose of the Study:

    • To develop an angle-independent virtual aperture for improved wide-angle imaging.
    • To design and evaluate monocentric lenses utilizing total internal reflection (TIR).

    Main Methods:

    • Implemented a virtual aperture using total internal reflection (TIR) from a thin low-index layer.
    • Derived a relationship between filtering layer properties and lens F-number.
    • Designed two 12 mm focal length, F/2.5 TIR lenses: one solid, one adjustable focus.

    Main Results:

    • Achieved absolutely uniform resolution and light collection over wide angles (84° and 106°).
    • Demonstrated significant improvements in light collection and angular resolution per unit volume.
    • Validated the effectiveness of TIR virtual apertures in monocentric wide-angle designs.

    Conclusions:

    • TIR virtual apertures offer a superior alternative to conventional lens stops for wide-angle imaging.
    • The developed lens designs provide enhanced performance and compactness.
    • This technology promises advancements in imaging systems requiring wide fields of view.