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Erlangen 2018 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 27: Complex Plasmas and Dusty Plasmas II

P 27.4: Vortrag

Donnerstag, 8. März 2018, 14:55–15:10, KI 1.174

Particle size estimation of optical thick nanoparticle clouds — •Franko Greiner1, Nils Rehbehn1, Florian Kirchschlager2, and Sebastian Wolf31Institute of Experimental and Applied Physics, Kiel University — 2Department of Physics and Astronomy, UCL London — 3Institute of Theoretical Physics and Astrophysics, Kiel University

Up till now the basic physics of nanodusty plasmas is only little examined. Such plasmas have a very high dust density and therefore a high degree of electron depletion, i.e. the Havnes parameter is high compared to unity. The density and size of the nanoparticles are the key parameters for the understanding of the nanodusty plasma. In the interesting regime of high particle size and/or density, the nanodusty plasma becomes optical thick and standard Mie ellipsometry, which relies on single scattering, fails. Recently we have presented a method to include multiple scattering into Mie ellipsometry. We used 3D Monte-Carlo polarized radiative transfer simulations which allow us to calculate the characteristics of light scattered by the nanoparticle cloud with arbitrary optical depth [1]. Including the spatio-temporal development of the experimental density profile into the simulation enables us to estimate the particle radius for high optical depths.

[1] F. Kirchschlager et al., Appl. Phys. Lett. 110, (2017)

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