Formation of honeycomb-Kagome hexagonal superlattice pattern with dark discharges in dielectric barrier discharge

Abstract

A honeycomb-Kagome hexagonal superlattice pattern with dark discharges is observed in dielectric barrier discharge (DBD) system for the first time. The spatiotemporal structure of the honeycomb-Kagome hexagonal superlattice pattern with dark discharges investigated by an intensified charge-coupled device (ICCD) and the photomultipliers (PMTs) shows that it is an interleaving of three different sub-lattices, which are bright-spot, invisible honeycomb lattice, and Kagome lattice with invisible frameworks and dim-spots, respectively. The invisible honeycomb lattices and Kagome lattices are actually composed of the dark discharges. By using optical emission spectra method, it is found that the plasma parameters of the three different sub-lattices are different. The influence of the dark discharges on the pattern formation is discussed. The results maybe have significance for the investigation of the dark discharges and will accelerate the development of the self-organized pattern dynamics.

Formation mechanism of bright and dark concentric-ring pattern in dielectric barrier discharge

“…It is obvious that there are three distinct pulses with different widths or intensities within half the current cycle for the current waveforms. Normally, there is a strong relationship between the number of sublattices of the pattern and the number of current pulses in the DBD system [20]. As we described earlier in figure 2(d), the bright and dark concentric-ring pattern is composed of wide bright concentric-ring structures and narrow dark concentric-ring structures.…”

“…The reason for the formation of the dim spots was explained as the surface discharges produced by the adjacent different bright spots coming together at the position of the dim spots [19]. In 2019, Li et al presented a bright-dim hollow hexagonal superlattice pattern based on selective discharges in a DBD system [20]. In 2022, a hexagonal superlattice pattern composed of bright spots and dim spots was observed by Pan et al Surprisingly, the hexagonal superlattice pattern, which appears to the naked eye to be composed only of dim spots and bright spots, is actually formed of three completely different sublattices [21].…”