Realization of a motility-trap for active particles

摘要: Trapping of atomic and mesoscopic particles with optical fields is a practical technique employed in many research disciplines. Developing similar trapping methods for self-propelled, i.e. active, particles is, however, challenging due to the typical anisotropic material composition Janus-type active particles. This renders their magneto-optical be difficult. Here we present realization motility-trap particles, which only exploits self-propulsion properties. By combining experiments, numerical simulations, theory, show that, under appropriate conditions, force-free rotation direction towards trap's center can achieved, results an exponential localization Because this mechanism applied any propulsion scheme, expect such motility-tweezers relevant fundamental studies self-driven objects as well applications autonomous microrobots. An outstanding challenge matter physics control motion Here, authors motility trap that combine simulations demonstrate robust spatio-temporal