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(a) A SPP converting a plane wave into a helical wave. (b) Design of a turbine-like micro-rotor. (c) The SEM image of the fabricated one. (d) Schematic diagram of the driving mechanism: A – refraction on the helicoid; B – internal reflection on the helicoid; C – refraction on the vertical.
(a) Correlation between speed of rotation and the position of in-focus plane. (b)–(e) Four typical positions of the focus plane off the substrate that result in different speeds of rotation.
Dependence of rotation speed upon driving power. (a) Comparison of 30-blade rotors with radius 15 μm, 20 μm, and 25 μm. (b) Comparison of 15-μm-radius rotors with 30, 25, and 15 blades. (c) and (d) Relations between rotation speed and driving torque, corresponding to (a) and (b), respectively.
(a) Contour of velocity magnitude in the plane y = 0 (15-blade rotor with radius 15 μm); (b) Streamlines shown by trajectories of massless, dimensionless virtual particles that start floating at different positions.
Comparison of five micro-rotors.
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