We describe what are to our knowledge the first measurements of the propagation of coherent, single-cycle pulses of terahertz radiation in a scattering medium. By measuring the transmission as a function of the length L of the medium, we extract the scattering mean free path <i>l</i><sub>s</sub>(ω) over a broad bandwidth. We observe variations in <i>l</i><sub>s</sub> ranging over nearly 2 orders of magnitude and covering the entire thin sample regime from <i>L/l</i><sub>s</sub><<1 to <i>L/l</i><sub>s</sub>~10 . We also observe scattering-induced dispersive effects, which can be attributed to the additional path traveled by photons scattered at small angles.
© 2001 Optical Society of America
Jeremy Pearce and Daniel M. Mittleman, "Propagation of single-cycle terahertz pulses in random media," Opt. Lett. 26, 2002-2004 (2001)