Experimental and numerical investigation of terahertz transmission through strongly scattering sub-wavelength size spheres

Mujumdar, S.; Chau, K. J.; Elezzabi, A. Y.
December 2004
Applied Physics Letters;12/20/2004, Vol. 85 Issue 25, p6284
Academic Journal
We report on experimental and numerical studies of terahertz propagation in strongly scattering random media. 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 in excellent agreement with those predicted from a Monte Carlo photon migration model. The transmitted pulses are analyzed with a classical effective medium approximation. Due to the subwavelength size of the random scatterers, it is found that the effective medium approximation underestimates the accumulated pulse phase acquired by the high frequencies during pulse propagation.


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