Low-temperature microplasmas confined to quasi-ellipsoidal cavities have been observed to interact with free columnar filaments produced in a parallel plate dielectric barrier discharge structure. Small arrays of microcavities, fabricated into the interior surfaces of two glass plates separated by 80 μm, support stable glows having major and minor axes of 700 ± 50 and 540 ± 20 μm, respectively, for a Ne gas pressure of 300-760 Torr. Surrounding the bound (microcavity) plasmas are diffuse columnar microplasmas having a mean diameter and separation (pitch) of 136 ±10 and 485 ± 60 μm, respectively. Optical images of free microplasmas interacting with only two ∼700 μm-diameter cavities show microplasmas trapped both at the perimeters of the microcavities as well as along a line bisecting the microcavities.
- optical emission
ASJC Scopus subject areas
- Nuclear and High Energy Physics
- Condensed Matter Physics