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Related Concept Videos

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,...
Total Internal Reflection Fluorescence Microscopy01:05

Total Internal Reflection Fluorescence Microscopy

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.
Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

Super-resolution fluorescence microscopy (SRFM) provides a better resolution than conventional fluorescence microscopy by reducing the point spread function (PSF). PSF is the light intensity distribution from a point that causes it to appear blurred. Due to PSF, each fluorescing point appears bigger than its actual size, and it is the PSF interference of nearby fluorophores that causes the blurred image. Various approaches to achieving higher resolution through SRFM have recently been developed.

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Related Experiment Video

Updated: Jun 12, 2026

Multimodal Imaging and Spectroscopy Fiber-bundle Microendoscopy Platform for Non-invasive, In Vivo Tissue Analysis
10:35

Multimodal Imaging and Spectroscopy Fiber-bundle Microendoscopy Platform for Non-invasive, In Vivo Tissue Analysis

Published on: October 17, 2016

Metasurface integrated optics for fluorescence imaging endoscopy.

Susan Thomas, Shanti Bhattacharya, Francesco Ferranti

    Optics Express
    |June 11, 2026
    PubMed
    Summary
    This summary is machine-generated.

    A novel metasurface integrated with a gradient refractive index (GRIN) lens enhances confocal fluorescence imaging quality. This hybrid system simplifies optics, improving contrast and resolution in endoscopy without explicit chromatic aberration correction.

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    Area of Science:

    • Optics
    • Biomedical Engineering
    • Materials Science

    Background:

    • Metasurfaces offer off-axis aberration correction in reflectance imaging.
    • Chromatic aberration limits image quality in confocal fluorescence imaging.
    • Conventional color correction uses complex multi-lens systems.

    Purpose of the Study:

    • To evaluate a single metasurface with a gradient refractive index (GRIN) lens for confocal fluorescence imaging.
    • To demonstrate improved image quality and simplified optical design.
    • To assess the performance of a metasurface-integrated aberration-corrected lens system for compact endoscopy.

    Main Methods:

    • Integration of a metasurface with a GRIN lens for confocal fluorescence endoscopy.
    • Design optimization where excitation and emission wavelengths focus at different planes, eliminating explicit chromatic aberration correction.
    • Comparison of the hybrid meta-GRIN lens system with a system lacking a meta-element using resolution targets and biological tissue.

    Main Results:

    • Reflectance imaging showed a 3.5-fold contrast improvement on resolution targets.
    • Fluorescence imaging of mammalian brain tissue demonstrated a 2-fold increase in contrast-to-noise ratio at intermediate to extreme fields.
    • Achieved a focal spot with a 1/e^2 beamwidth of 3.1 µm (on-axis) and 3.3 µm (extreme field) over a 175 µm × 40 µm field of view.

    Conclusions:

    • A single metasurface combined with a GRIN lens effectively improves confocal fluorescence imaging quality in endoscopy.
    • The hybrid system simplifies optical assembly and alignment compared to conventional multi-lens approaches.
    • This metasurface-GRIN lens system offers a compact and portable solution for high-quality endoscopic imaging.