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

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A precise method to determine the angular distribution of backscattered light to high angles.

P Gross¹, M Störzer, S Fiebig

¹Fachbereich Physik, University of Konstanz, Box M621, 78457 Konstanz, Germany.

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|April 7, 2007

Summary

Researchers developed a new method to measure light scattering in samples, enabling precise characterization of coherent backscattering and transport mean free paths.

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Area of Science:

Optics and Photonics
Condensed Matter Physics

Background:

Coherent backscattering (CBS) is a hallmark of multiple light scattering.
Understanding CBS is crucial for studying light localization phenomena, such as Anderson localization.
Characterizing the angular dependence of CBS requires broad angular detection ranges.

Purpose of the Study:

To present a novel technique for measuring the angular dependence of diffusely scattered light intensity in backscattering geometry.
To enable precise determination of transport mean free paths in multiple scattering media.
To facilitate the search for the transition to Anderson localization of light.

Main Methods:

Introduction of a new parallel intensity recording technique for one-shot measurements over a wide angular range (-60 to +85 degrees).
Utilizing sample rotation for configurational averaging and circularly polarized light to suppress singly scattered light (up to 97%).
Integration with a standard setup for small-angle measurements (+/-3 degrees) for comprehensive CBS cone characterization.

Main Results:

The new technique allows for fast alignment and short measuring times, minimizing illumination variations.
Backscattering enhancements approaching two were achieved, indicating effective suppression of singly scattered light.
Accurate determination of transport mean free paths as low as 235 nm was demonstrated.

Conclusions:

The developed method provides a robust and efficient approach for characterizing coherent backscattering cones.
This technique is valuable for investigating light scattering phenomena and Anderson localization.
The ability to measure small transport mean free paths opens new avenues for material characterization.