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Updated: Feb 27, 2026

Measuring Spatially- and Directionally-varying Light Scattering from Biological Material

Measuring Spatially- and Directionally-varying Light Scattering from Biological Material

Published on: May 20, 2013

Sub-Nyquist sampling boosts targeted light transport through opaque scattering media.

Yuecheng Shen¹, Yan Liu¹, Cheng Ma¹

¹Optical Imaging Laboratory, Department of Biomedical Engineering, Washington University in St. Louis, One Brookings Drive, St. Louis, Missouri, USA, 63130.

|July 4, 2017

Summary

Researchers demonstrated focusing light through scattering media using under-sampled optical time-reversal. This novel approach achieves brighter foci and improves signal-to-noise ratio, advancing biophotonics applications.

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Area of Science:

Biophotonics
Wave Optics
Non-invasive Imaging

Background:

Optical time-reversal focuses light through scattering media like biological tissue.
Previous methods required extensive sampling of scattered light, adhering to the Nyquist criterion.

Purpose of the Study:

To investigate if light can be focused through scattering media using under-sampled optical time-reversal.
To explore the impact of sub-Nyquist sampling on focus intensity and signal quality.

Main Methods:

Theoretical modeling of light propagation through scattering media under sub-Nyquist sampling.
Experimental validation of under-sampled optical time-reversal for focusing light.
Comparison of focusing performance with well-sampled conditions.

Main Results:

Successful focusing of light through scattering media with under-sampled scattered fields.
Achieved foci one order of magnitude brighter than those from well-sampled methods.
Demonstrated improved signal-to-noise ratio and collection efficiency with sub-Nyquist sampling.

Conclusions:

Under-sampling in optical time-reversal is feasible and can enhance focusing performance.
This technique offers a significant advancement for deep-tissue optical imaging and therapies.
Sub-Nyquist sampling redefines the understanding and application of optical time-reversal.