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