Branching, spatial periodicity, and confluence of plasma waves propagating in planar micro-dielectric barrier discharge devices

Yaogong Wang, Xuan Zhou, Xiaoqin Ma, Xiaoning Zhang, Chunliang Liu, Dingxin Liu, Sung Jin Park, J. Gary Eden

Research output: Contribution to journalArticle

Abstract

Self-organization of periodic, streamer-like ionization waves in planar microplasma devices having a dielectric barrier discharge structure is observed. In contrast to plasma propagation in arrays of microchannels or microcavities, the ionization waves originate from a single point but rapidly sub-divide into as many as 10 'branch' plasma wave packets that eventually recombine. In less than 70 ns, the self-organization of the spatially-periodic array of co-propagating branches is complete and two successive sets of waves, separated in distance and time by ∼1.8 mm and ∼50 ns, respectively, are generated. The mean propagation velocity of each plasma packet is greater than 70 km s-1 but values as large as 150 km s-1 have been measured. Because the propagation path for all subsequent streamers is established by the first set of plasma packets, the intensity of the second set is noticeably enhanced. The average length of the primary branches is ∼1.5 mm but reaches a maximum of ∼4.5 mm as the wave packets travel an overall distance of 1 cm. These phenomena are interpreted in terms of photoelectron emission from the floor and walls of the shallow dielectric microcavity, induced by radiation from the advancing packets, and the rapid collapse of the sheath of each microplasma owing to the accumulation of charge on the underlying dielectric. The spatial profiles of the propagating plasmas suggest that generating and probing plasma solitons may now be feasible.

Original languageEnglish (US)
Article number09LT01
JournalPlasma Sources Science and Technology
Volume28
Issue number9
DOIs
StatePublished - Sep 4 2019

Keywords

  • ionization wave propagation
  • micro dielectric barrier discharge
  • periodic self-organization

ASJC Scopus subject areas

  • Condensed Matter Physics

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