Control of wave processes in systems of active Brownian particles in gas-discharge plasma

The influence of laser-induced active Brownian motion on dust-acoustic instability in the colloidal plasma of a direct current glow discharge was experimentally studied. The dust structure was formed by spherical monodisperse melamine-formaldehyde particles with a partial copper coating (Janus particles). It is shown that with increasing laser radiation intensity, a self-excited plane dust-acoustic wave decays. At an intensity of ≈1.5 W/cm2, the wave ceases to be observed in a three-dimensional plasma–dust cloud. As the intensity decreases, the wave is excited again, which indicates the reversibility of the process. The results obtained can be used to control collective plasma processes.