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Related Experiment Video

Updated: Feb 10, 2026

In Situ Monitoring of Diffusion of Guest Molecules in Porous Media Using Electron Paramagnetic Resonance Imaging

In Situ Monitoring of Diffusion of Guest Molecules in Porous Media Using Electron Paramagnetic Resonance Imaging

Published on: September 2, 2016

Diffusion in translucent media.

Zhou Shi^1,2, Azriel Z Genack³

¹Department of Physics, Queens College and Graduate Center of the City University of New York, Flushing, NY, 11367, USA.

Nature Communications

|May 12, 2018

Summary

This summary is machine-generated.

Diffusion theory fails for thin translucent samples. This study reveals similar transport scaling in translucent and opaque media, explaining suppressed delay times in wave transport phenomena.

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Area of Science:

Physics
Wave Phenomena
Optics

Background:

Diffusion theory describes wave transport via random scattering.
This approach is known to fail for translucent samples thinner than the scattering distance.
This limitation affects fields like biomedicine and communications.

Purpose of the Study:

To investigate wave transport in translucent media.
To compare transport characteristics in translucent and opaque samples.
To explain discrepancies between diffusion theory and experimental observations.

Main Methods:

Optical measurements on translucent samples.
Numerical simulations of wave transport.
Analysis of transmission scaling and intensity profiles.

Main Results:

Transmission scaling in translucent media matches that of opaque media.
Intensity profiles of transmission eigenchannels exhibit similar forms.
Observed suppressed optical and ultrasonic delay times are explained.

Conclusions:

Wave transport in translucent and opaque media shares fundamental similarities.
The diffusion approach's failure in thin translucent samples is due to these similarities.
This finding reconciles puzzling experimental observations with theoretical predictions.