Abstract:
Photon migration in a randomly inhomogeneous, highly scattering and absorbing
semi-infinitemediumwith a plane boundary is considered by aMonte Carlo (MC)
technique. The employed MC technique combines the statistical weight scheme and
real photon paths simulation, allowing the exclusion of the energy conservation
problem. The internal reflection of the scattered radiation on the medium
interface is taken into account by allowing the trajectories of photon packets
to be split into reflected and transmitted parts. The spatial photon sensitivity
profile (SPSP), spatially resolved diffuse reflectance and angular and spatial
photon detectorweight distributions are considered in terms of Fresnel’s
reflection/refraction on the boundary of the medium. The effect of the
refractive index match is predicted correctly by the MC method and by the
diffusion approximation. The results demonstrate that matching of the refractive
index of the medium significantly improves the contrast and spatial resolution
of the spatial photon sensitivity profile (SPSP). The results of simulation of
the spatially resolved diffuse reflectance agree well with the results predicted
by the diffusion approximation and the experimental results reported earlie