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Related Concept Videos

Light Acquisition02:16

Light Acquisition

In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
Vision01:24

Vision

Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
Focusing of Light in the Eye01:16

Focusing of Light in the Eye

Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
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 7, 2026

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
08:39

Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

Published on: January 28, 2019

Spatial filtering of first-arriving light.

M Shih, E Leith

    Applied Optics
    |November 2, 2010
    PubMed
    Summary
    This summary is machine-generated.

    Combining low-pass spatial filtering with the first-arriving-light method improves imaging through scattering media with a specular transmission component. This technique is ineffective for media lacking this specular component, limiting its broad applicability.

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    Single Molecule Fluorescence Microscopy on Planar Supported Bilayers
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    Single Molecule Fluorescence Microscopy on Planar Supported Bilayers

    Published on: October 31, 2015

    Related Experiment Videos

    Last Updated: Jun 7, 2026

    Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator
    08:39

    Shaping the Amplitude and Phase of Laser Beams by Using a Phase-only Spatial Light Modulator

    Published on: January 28, 2019

    Single Molecule Fluorescence Microscopy on Planar Supported Bilayers
    20:00

    Single Molecule Fluorescence Microscopy on Planar Supported Bilayers

    Published on: October 31, 2015

    Area of Science:

    • Optics and Photonics
    • Biomedical Imaging
    • Scattering Media Analysis

    Background:

    • Imaging through scattering media is challenging due to light diffusion.
    • The first-arriving-light (FAL) method enhances image quality by isolating ballistic photons.
    • Spatial filtering can potentially improve the selectivity of light propagation methods.

    Purpose of the Study:

    • To investigate the combined effect of low-pass spatial filtering and the first-arriving-light method.
    • To determine the efficacy of this combined approach for imaging through scattering media with varying optical properties.

    Main Methods:

    • Implementation of a low-pass spatial filter integrated with the FAL imaging technique.
    • Experimental setup involving imaging through scattering media with and without a specular transmission component.
    • Quantitative analysis of image quality and resolution before and after applying the combined method.

    Main Results:

    • The combined method significantly improved imaging performance for media with a notable specular transmission component.
    • Image quality enhancement was observed, with clearer visualization of objects behind the scattering medium.
    • The technique showed minimal to no improvement for scattering media lacking a significant specular transmission component.

    Conclusions:

    • The combination of low-pass spatial filtering and FAL is a promising technique for specific scattering imaging applications.
    • The presence of a specular transmission component is critical for the success of this modified imaging approach.
    • Future research should explore adaptations for media without specular transmission to broaden the method's utility.