Figure 1| Morphology- and rotation-dependent optical torques. (IMAGE)

Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS

Figure 1| Morphology- and rotation-dependent optical torques.

Caption

Figure 1 | Morphology- and rotation-dependent optical torques. a, Top, evolution of particle shape from a sphere to cylinders and polyhedra of increasing complexity. Bottom, definition of the rotation angle that describes the orientation of a non-spherical particle relative to the horizontal axis. b, Schematics of a screw (representing a specific morphology of shape and size) rotating clockwise (top view) and moving downwards in a right-handed circular polarised beam by the positive optical torques. c, In a paraxial system, when the rotation angle of the shaped particle changes, negative optical torque emerges, making the screw rotate counter-clockwise and move upwards. d, In a specific rotation angle, the screw may rotationally freeze under the balance of positive and negative optical torques.

Credit

Cheng-Wei Qiu et al.

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