Volume 106, Number 4, May 2014
|Number of page(s)||5|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||26 May 2014|
Granular structure determined by terahertz scattering
1 Institut für Materialphysik im Weltraum, Deutsches Zentrum für Luft- und Raumfahrt - 51170 Köln, Germany
2 Institut für Planetenforschung, Deutsches Zentrum für Luft- und Raumfahrt - Rutherfordstraße 2, 12489 Berlin, Germany
3 Technische Universität Berlin, Institut für Optik und Atomare Physik - Straße des 17. Juni 135, 10623 Berlin, Germany
Received: 18 March 2014
Accepted: 30 April 2014
Light scattering from particles reveals static and dynamical information about the particles and their correlations. Such methods are particularly powerful when the wavelength of the light is chosen similar to the sizes and distances of the particles. To apply scattering to investigate granular matter in particular —or other objects of similar submillimeter size— light of suitable wavelength in the terahertz regime needs to be chosen. By using a quantum cascade laser in a benchtop setup we determine the angle-dependent scattering of spherical particles as well as coffee powder and sugar grains. The scattering from single particles can be interpreted by form factors derived within the Mie theory. In addition, collective correlations can be extracted as static structure factors and compared to recent computer simulations.
PACS: 81.05.Rm – Porous materials; granular materials / 07.57.Kp – Bolometers; infrared, submillimeter wave, microwave, and radiowave receivers and detectors / 78.35.+c – Brillouin and Rayleigh scattering; other light scattering
© EPLA, 2014
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