Intensity control of individual DBD plasma filament. I. Experiment with a needle electrode

M. C. Paliwoda, J. L. Rovey

Research output: Contribution to journalArticlepeer-review


Filamentary volume dielectric barrier discharge (DBD) produces patterned plasma structures that are currently being explored for reconfigurable metamaterial applications. In this work, the presence and intensity of a single filament (within an array of filaments) are controlled by biasing a low voltage needle electrode by less than 7% of the driving voltage. The current, voltage, and time-averaged normalized light intensity were measured while varying the needle voltage through self-biasing resistors. For a 7.5 kV, 3.2 kHz DBD in air, the needle-controlled filament intensity varies from 80% to 0% of the light intensity of surrounding filaments. When the biased voltage prevents a filament from forming, the voltage difference across the air gap and between the electrodes remains well above the breakdown voltage. Redistributed charge inside the DBD rather than the cross-gap voltage difference is the mechanism which controls the filament intensity when surrounding filaments are present. This work presents a method for controlling an array of plasma filaments with needle electrodes, at voltage biases more manageable for a control circuit.

Original languageEnglish (US)
Article number053504
JournalPhysics of Plasmas
Issue number5
StatePublished - May 1 2017
Externally publishedYes

ASJC Scopus subject areas

  • Condensed Matter Physics


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