Spatiotemporal distribution of surface charges in square-grid state in a dielectric barrier discharge
2018
The spatiotemporal distribution of surface charges in the square-grid state in a dielectric barrier discharge system is investigated at the sub-microsecond time scale using a spectrograph combined with a high-speed framing camera. With increasing driving parameter, the square-grid state transforms from a square pattern into one composed of three sub-lattices: a core sub-lattice with square symmetry and two marginal lattices with lower symmetry. In essence, this breaks the symmetry of the square-grid state—a highly symmetric state. From this perspective, the square pattern trifurcates to a square-grid state of lower symmetry. The electron density of the square-grid state changes periodically, both temporally and spatially, resulting in a periodic distribution of surface charges over the dielectric layer. The calculation of the surface-charge field further verifies that the surface charges have a significant influence on the formation of the square-grid state consistent with the experimental results.
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