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Directional transport-dominated particle separation presents major challengesin many technological applications. The Feynman ratchet can convert the randomperturbation into directional transport of particles, offering innovativeseparation schemes. Here, we propose the design of a dusty plasma ratchetsystem to accomplish the separation of micron-sized particles. The dustparticles are charged and suspended at specific heights within the saw channel,depending on their sizes. Bi-dispersed dust particles can flow along the sawchannel in opposite directions, resulting in a perfect purity of particleseparation. We discuss the underlying mechanism of particle separation, whereindust particles of different sizes are suspended at distinctive heights andexperience electric ratchet potentials with opposite orientations, leading totheir contrary flows. Our results demonstrate a feasible and highly efficientmethod for separating micron-sized particles.

Separating micrometer-sized particles utilizing a dusty plasma ratchet