Evidence Of Mie Scattering At Terahertz Frequencies In Powder Materials

APPLIED PHYSICS LETTERS(2014)

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摘要
We present experimental results as well as modelling concerning terahertz (THz) wave scattering by powder materials with grain size of the order of the wavelength. The studied material is a mixture of high density polyethylene and fructose powders, whose grain size is varied from a sample to another one while the volume concentration is kept constant. Experimental data are recorded with a THz time-domain spectroscopy set up. The scattering contribution to the total propagation loss in such powders shows a resonant behaviour for grain size roughly equal to the THz wavelength, for which it reaches 80%-90% of the total loss. Modelling using Mie theory allows us to well describe the absorption and scattering phenomena. (C) 2014 AIP Publishing LLC.
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