Time-resolved pulse propagation in a strongly scattering material.
Light transport in macroporous gallium phosphide, perhaps the strongest nonabsorbing scatterer of visible light, is studied using phase-sensitive femtosecond pulse interferometry. Phase statistics are measured at optical wavelengths in both reflection and transmission and compared with theory. The diffusion constant of light is measured in both reflection and transmission as a function of thickness and compared with theories for diffusive transport and localization. An unusually high energy velocity due to the bicontinuous structure of the porous network is reported. For such strongly scattering samples, we show that surface properties and the effective index of refraction need to be treated carefully.
Johnson
Patrick M
PM
Van der Waals-Zeeman Instituut, Universiteit van Amsterdam, 1018 XE Amsterdam, The Netherlands. P.M.Johnson@phys.uu.nl
Imhof
Arnout
A
Bret
Boris P J
BP
Rivas
Jaime Gómez
JG
Lagendijk
Ad
A