Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Focusing of Light in the Eye01:16

Focusing of Light in the Eye

2.5K
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...
2.5K
Super-resolution Fluorescence Microscopy01:37

Super-resolution Fluorescence Microscopy

6.9K
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...
6.9K
Emission Spectra02:39

Emission Spectra

50.8K
When solids, liquids, or condensed gases are heated sufficiently, they radiate some of the excess energy as light. Photons produced in this manner have a range of energies, and thereby produce a continuous spectrum in which an unbroken series of wavelengths is present.
50.8K
Light Acquisition02:16

Light Acquisition

8.4K
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.
8.4K
Photoelectric Effect02:26

Photoelectric Effect

29.3K
When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
29.3K
Total Internal Reflection Fluorescence Microscopy01:05

Total Internal Reflection Fluorescence Microscopy

5.6K
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.
5.6K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Experimental demonstration of high space compression by optical spaceplates.

Nature communications·2026
Same author

Parametric Amplification of Optical Pulses through Synthetic Motion in a Time-Varying Medium.

Nano letters·2026
Same author

Engineering walk-off-induced orbital angular momentum spectrum in spontaneous parametric downconversion.

Optics letters·2026
Same author

Epsilon-near-zero time-gate for high-fidelity spatial information transfer through dynamic scattering media.

Nature communications·2026
Same author

An Epsilon-Near-Zero-Based Nonlinear Platform for Ultrafast Re-Writable Holography.

Nanophotonics (Berlin, Germany)·2026
Same author

Fast quantum ghost imaging with a single-photon-sensitive time-stamping camera.

Optics letters·2025

Related Experiment Video

Updated: Jun 6, 2025

Observation and Analysis of Blinking Surface-enhanced Raman Scattering
05:52

Observation and Analysis of Blinking Surface-enhanced Raman Scattering

Published on: January 11, 2018

7.4K

Strong reverse saturation and fast-light in ruby.

Akbar Safari, Cara Selvarajah, Jenine Evans

    Optics Letters
    |November 27, 2024
    PubMed
    Summary

    Ruby shows strong reverse saturation of absorption, causing light pulses to advance significantly. This fast-light effect in ruby has potential applications in optical devices.

    Area of Science:

    • Optics and Photonics
    • Condensed Matter Physics

    Background:

    • Reverse saturation of absorption is a rare phenomenon in light-matter interactions.
    • Understanding fast- and slow-light effects is crucial for optical technologies.

    Purpose of the Study:

    • To investigate the phenomenon of reverse saturation of absorption in ruby at 473 nm.
    • To measure and theoretically explain the observed temporal advancement of light pulses in ruby.

    Main Methods:

    • Experimental observation of reverse saturation of absorption in ruby.
    • Measurement of group velocity for a modulated laser beam in ruby.
    • Theoretical modeling using coherent population oscillation and time-dependent absorption.

    Main Results:

    More Related Videos

    Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy
    09:57

    Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy

    Published on: July 25, 2022

    3.9K
    Excitation-Scanning Hyperspectral Imaging Microscopy to Efficiently Discriminate Fluorescence Signals
    00:07

    Excitation-Scanning Hyperspectral Imaging Microscopy to Efficiently Discriminate Fluorescence Signals

    Published on: August 22, 2019

    8.0K

    Related Experiment Videos

    Last Updated: Jun 6, 2025

    Observation and Analysis of Blinking Surface-enhanced Raman Scattering
    05:52

    Observation and Analysis of Blinking Surface-enhanced Raman Scattering

    Published on: January 11, 2018

    7.4K
    Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy
    09:57

    Multiplex Chemical Imaging Based on Broadband Stimulated Raman Scattering Microscopy

    Published on: July 25, 2022

    3.9K
    Excitation-Scanning Hyperspectral Imaging Microscopy to Efficiently Discriminate Fluorescence Signals
    00:07

    Excitation-Scanning Hyperspectral Imaging Microscopy to Efficiently Discriminate Fluorescence Signals

    Published on: August 22, 2019

    8.0K
  • Ruby exhibits strong reverse saturation of absorption at 473 nm.
  • Observed temporal advancement of pulse peaks by over 100 microseconds.
  • Calculated a large, negative group index of -(1.7 ± 0.1) × 10^6, consistent with fast-light effects.

    • Conclusions:

    • The observed pulse advancement in ruby can be explained by coherent population oscillation and time-dependent absorption.
    • This study enhances understanding of fast- and slow-light phenomena in transition-metal-doped crystals.
    • Findings suggest potential applications in optical memories and delay lines.