Time-resolved depolarization analysis of back-scattered light

Ernesto Pini; Fabrizio Martelli; Diederik S. Wiersma; Alexander Gatto; Henrik Schäfer; Lorenzo Pattelli

doi:10.1117/12.3001002

12 March 2024 Time-resolved depolarization analysis of back-scattered light

Ernesto Pini, Fabrizio Martelli, Diederik S. Wiersma, Alexander Gatto, Henrik Schäfer, Lorenzo Pattelli

Proceedings Volume 12845, Polarized Light and Optical Angular Momentum for Biomedical Diagnostics 2024; 1284502 (2024) https://doi.org/10.1117/12.3001002
Event: SPIE BiOS, 2024, San Francisco, California, United States

Abstract

Studying the depolarization rate of light emerging from a turbid medium holds promise for the non-invasive characterization of its single-scattering properties, with relevant application in the quality analysis of different specimens or for diagnostic purposes in the biomedical field, to name a few. However, irrespective of sample geometry, the dynamics of light depolarization takes place on a time scale of few ps, which is too fast for traditional detection methods. Here, we present experimental results on the time-domain evolution of the depolarization ratio of light that is diffusely reflected from a scattering medium, using linearly polarized fs pulses in an all-optical gating scheme. Time-resolved reflectance curves are recorded in the parallel and perpendicular polarization channels relative to the illumination beam, granting direct access to the depolarization rate. We demonstrate our experimental approach on a lipid emulsion, fitting the data with a polarized Monte Carlo simulation to retrieve the average particle size and scattering asymmetry factor using just two time-domain reflectance measurements in a semi-infinite geometry.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Ernesto Pini, Fabrizio Martelli, Diederik S. Wiersma, Alexander Gatto, Henrik Schäfer, and Lorenzo Pattelli "Time-resolved depolarization analysis of back-scattered light", Proc. SPIE 12845, Polarized Light and Optical Angular Momentum for Biomedical Diagnostics 2024, 1284502 (12 March 2024); https://doi.org/10.1117/12.3001002

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