Diffuse imaging and radius dependent frequency correlations in strongly scattering media

Area of Science:

• Optics and Photonics
• Materials Science
• Condensed Matter Physics

Background:

• Understanding light propagation in scattering media is crucial for applications like diffuse imaging.
• Traditional methods for probing material transport properties can be complex and time-consuming.
• Speckle patterns generated by light interacting with materials offer rich information.

Purpose of the Study:

• To demonstrate a novel experimental probe for analyzing multiple scattering materials.
• To characterize the static and dynamic transport properties of opaque scattering media.
• To explore the potential of this technique for advanced diffuse imaging.

Main Methods:

• Utilizing a tunable wavelength light source focused onto an opaque sample surface.
• Recording spatial and frequency speckle patterns using a CCD and acousto-optical tunable filter.
• Analyzing average intensity and frequency correlations as a function of source distance.

Main Results:

• Successfully demonstrated the technique on a white paint sample.
• The method effectively captures spatial and frequency speckle patterns.
• The analysis yields insights into both static and dynamic transport properties.

Conclusions:

• The developed probe offers a facile and rapid method for characterizing scattering materials.
• This technique shows promise for static and time-resolved diffuse imaging in highly scattering media.
• The experimental setup is adaptable as an add-on for standard microscopy.