Abstract
We report on experimental and numerical studies of free space terahertz (THz) propagation in strongly scattering random dielectric media. The on-axis ballistic and small angle scattered transmission is measured through media of varying thickness. The experimental variations of the terahertz pulse group delay and scattering-induced effects such as temporal pulse distortion, spectral decay, and power attenuation as a function of sample thickness are well described by a Monte Carlo photon migration model. The transmitted pulses are analysed using the classical Bruggemann effective medium approximation (EMA). It is found that the effective medium approximation underestimates the accumulated pulse phase acquired by the high frequencies during pulse propagation. An empirically modified EMA provides accurate description of the random dielectric medium.
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