Related Experiment Video
Updated: Mar 9, 2026
08:19
Patterning via Optical Saturable Transitions - Fabrication and Characterization
Published on: December 11, 2014
7.2K
Phase Transitions in Diffusion of Light.
Roxana Rezvani Naraghi1,2, Aristide Dogariu1
1CREOL, The College of Optics and Photonics, University of Central Florida, Orlando, Florida 32816, USA.
Physical Review Letters
|January 7, 2017
Summary
Light transport in scattering media exhibits distinct stages not explained by classical diffusion. Strong evanescent-field couplings prevent wave localization, revealing new physics in light propagation.
Area of Science:
- Optics and Photonics
- Condensed Matter Physics
- Wave Phenomena
Background:
- Classical diffusion theory predicts light transport slows and localizes with increasing scattering.
- Previous models struggled to explain the complex evolution of light transport in strongly scattering media.
Purpose of the Study:
- To experimentally investigate and theoretically model the distinct stages of light transport in multiple scattering media.
- To identify the mechanisms preventing three-dimensional (3D) wave localization.
Main Methods:
- Experimental observation of light transport evolution in scattering media.
- Development of a microscopic model for electromagnetic wave propagation.
- Analysis of evanescent-field couplings and their impact on wave resonances.
Main Results:
- Observed distinct stages in light transport evolution, deviating from classical diffusion predictions.
- Demonstrated that strong evanescent-field couplings inhibit wave localization.
- Identified competing mechanisms that prevent 3D wave localization.
Conclusions:
- Light transport in strongly scattering media exhibits complex, non-classical behavior.
- Evanescent-field couplings play a crucial role in preventing wave localization and maintaining diffusion.
- The observed steady-state process offers insights into particle diffusion in correlated potentials and matter wave thermalization.
Related Concept Videos
02:18Interference and Diffraction
53.0K
Interference is a characteristic phenomenon exhibited by waves. When two electromagnetic waves interact with their peaks and troughs coinciding, a resulting wave with enhanced amplitude is produced. This is known as constructive interference. In this case, the two waves interacting are in phase with each other.
53.0K
01:16UV–Vis Spectroscopy: Molecular Electronic Transitions
3.3K
In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
3.3K
01:25Deactivation Processes: Jablonski Diagram
2.0K
Luminescence, the emission of light by a substance that has absorbed energy, is a process that involves the interaction of molecules with light. The energy-level diagram, or Jablonski diagram, is a graphical representation of these interactions, illustrating the various states and transitions a molecule can undergo. In a typical Jablonski diagram, the lowest horizontal line represents the ground-state energy of the molecule, which is usually a singlet state. This state represents the energies...
2.0K
01:22Photoreceptors and Visual Pathways
10.4K
At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
10.4K
02:12The Wave Nature of Light
62.8K
The nature of light has been a subject of inquiry since antiquity. In the seventeenth century, Isaac Newton performed experiments with lenses and prisms and was able to demonstrate that white light consists of the individual colors of the rainbow combined together. Newton explained his optics findings in terms of a "corpuscular" view of light, in which light was composed of streams of extremely tiny particles traveling at high speeds according to Newton's laws of motion.
62.8K
01:23Photoluminescence: Fluorescence and Phosphorescence
4.3K
Photoluminescence is a process where a molecule absorbs light energy and re-emits it in the form of light. This phenomenon occurs when a substance absorbs photons, promoting its electrons to higher energy level excited states, followed by a relaxation process in which the electrons return to their original ground state energy levels and emit light. Photoluminescence is widely observed in various materials, including semiconductors, and organic and inorganic compounds.
A pair of electrons in a...
A pair of electrons in a...
4.3K