Experimental determination of effective light transport properties in fully anisotropic media

Year: 2024

Authors: Pini E., Naglic P., Burmen M., Gatto A., Schafer H., Wiersma D.S., Pattelli L.

Autors Affiliation: Univ Firenze, Dept Phys & Astron, Sesto Fiorentino, Italy; European Lab Nonlinear Spect, Sesto Fiorentino, Italy; Univ Ljubljana, Fac Elect Engn, Lab Imaging Technol, Ljubljana, Slovenia; Sony Europe BV, Stuttgart Technol Ctr, Stuttgart, Germany; Ist Nazl Ric Metrol, Turin, Italy; CNR, Natl Inst Opt, Sesto Fiorentino, Italy.

Abstract: Structurally anisotropic materials are ubiquitous in several application fields, yet their accurate optical characterization remains challenging due to the lack of general models linking their scattering coefficients to the macroscopic transport observables and the need to combine multiple measurements to retrieve their direction-dependent values. Here, we present an improved method for the experimental determination of light-transport tensor coefficients from the diffusive rates measured along all three directions, based on transient transmittance measurements and a generalized Monte Carlo model. We apply our method to the characterization of light-transport properties in two common anisotropic materials-polytetrafluoroethylene tape and paper-highlighting the magnitude of systematic deviations that are typically incurred when neglecting anisotropy.

Journal/Review: ADVANCED PHOTONICS NEXUS

Volume: 3 (5)      Pages from: 56017-1  to: 56017-8

More Information: This work was partially funded by the European European Union’s NextGenerationEU Programme with the I-PHOQS Research Infrastructure [IR0000016, ID D2B8D520, CUP B53C22001750006] Integrated infrastructure initiative in Photonic and Quantum Sciences. E.P. acknowledges financial support from Sony Europe B.V. L.P. acknowledges the CINECA award under the ISCRA initiative, for the availability of high-performance computing resources and support (ISCRA-C ARTTESC), and NVIDIA Corporation for the donation of the Titan X Pascal GPU. M.B. and P.N. acknowledge financial support from the Slovenian Research and Innovation Agency (Grant Nos. J2-2502, L2-4455, and J2-50092). Fabrizio Martelli is kindly acknowledged for the fruitful discussion.
KeyWords: multiple scattering; time-resolved transmittance; anisotropic diffusion; scattering tensor; optical gating; fibrous materials
DOI: 10.1117/1.APN.3.5.056017

Citations: 1
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