Pearce J, Mittleman D M
Opt Lett. 2001 Dec 15;26(24):2002-4. doi: 10.1364/ol.26.002002.
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 l(s)(omega) over a broad bandwidth. We observe variations in l(s) ranging over nearly 2 orders of magnitude and covering the entire thin sample regime from L/l(s)<<1 to L/l(s)~10 . We also observe scattering-induced dispersive effects, which can be attributed to the additional path traveled by photons scattered at small angles.
据我们所知，我们描述了太赫兹辐射的相干单周期脉冲在散射介质中传播的首次测量。通过测量传输随介质长度L的变化，我们在很宽的带宽上提取了散射平均自由程l(s)(ω)。我们观察到l(s)的变化范围接近2个数量级，涵盖了从L/l(s)<<1到L/l(s)~10的整个薄样品区域。我们还观察到散射引起的色散效应，这可归因于小角度散射光子所走过的额外路径。
