Abstract
Optical conveyors of airborne particles were previously demonstrated using different techniques allowing particles to be conveyed along straight trajectories either down or upstream the laser radiation direction. Here, the operation of an optical conveyor which has the geometry of an Archimedes screw whose central axis is a predefined arbitrary trajectory in 3D space allowing to convey particles along any desired paraxial trajectory, is demonstrated. The beams' trajectory in space can be chosen arbitrarily as long as it is paraxial. With this beam, we convey airborne particles along centimeter-scale arbitrary trajectories in adjustable velocities and directions.
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