Berlin 2014 – wissenschaftliches Programm

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P: Fachverband Plasmaphysik

P 19: Poster Session - Low Temperature Plasmas

P 19.6: Poster

Mittwoch, 19. März 2014, 16:30–18:30, SPA Foyer

Controlled structures in laterally patterned barrier discharges by illumination of a semiconductor electrode — Robert Wild, Thomas Schumann, and •Lars Stollenwerk — Institute of Physics, Ernst-Moritz-Arndt University of Greifswald

In this contribution, we present a possibility to actively control emerging patterns in laterally extended barrier discharges. One of the barriers is a semiconductive GaAs electrode. As the electrode is illuminated from its plasma-far side, the voltage inside the plasma gap is increased. If the gap voltage becomes higher than the ignition voltage of the gas, a (laterally patterned) discharge is started. The lateral resolution of the illumination induced discharge control is determined. It is shown that the variation of illumination power density is the most sensitive way to control the luminousity gradient of the discharge boundary in a laterally homogeneous discharge. It is further shown that also the number of current spots in a patterned discharge can be influenced by the external illumination.

Funded by the Deutsche Forschungsgemeinschaft, Sonderforschungsbereich SFB TRR-24, B14.