Bremen 2017 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 5: Plasma Diagnostics

P 5.3: Poster

Montag, 13. März 2017, 16:30–18:30, HS Foyer

Measurements with microparticles trapped by optical tweezers with and without a plasma — •Viktor Schneider and Holger Kersten — Institute of Experimental and Applied Physics, Christian-Albrechts-University Kiel

Because of their small size (µm to nm) microparticles are used in studies of dynamic processes [1] as well as single probes in plasma sheath diagnostics [2, 3]. A disadvantage in a plasma although is, that they cannot be manipulated in their position as desired.
We present measurements with SiO2 particles which can be manipulated without any temporal or spatial restrictions. Force measurements in presence of a plasma and without were made by using laser tweezers [4]. Based on the determined forces, the electric field in the sheath can be estimated and residual charges on the particle after turning off the plasma [5] can be obtained.
[1] J. Schablinski et al., Phys. Plasmas 22(2015), 043703
[2] H. R. Maurer et al., Contrib. Plasma Phys. 51(2011), 218-227
[3] A. Douglass et al., J. Plasma Phys. 82(2016), 615820402
[4] V. Schneider, H. Kersten, PAST 1(2013), 164
[5] L. Couëdel et al., Contrib. Plasma Phys. 49(2009), 235-259

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