Observation of laser-pulse-induced traveling microbubbles in dusty plasma liquids

An overview is given of the experimental observation of spherical traveling plasma bubbles with low dust density inside rf dusty plasma liquids (DPLs) through pulsed laser ablation from suspended dust particles, as well as the investigation of the relation with the self-organized dust density waves. The dense plasma plume from ablation expels dust particles and forms the bubble. The lower dust-induced electron depletion in the bubble causes a denser plasma through the higher ionization rate, which compensates the diffusion loss and exerts outward ion drags to keep the bubble from collapsing. The downward motion of the bubble is associated with the repelling and attracting of the particles in the leading and trailing zones of the bubble.