The rotation control of particles in optical tweezers is often subject to the spin or orbit angular momentum induced optical torque, which is susceptible to the mechanical and morphological properties of individual particle. Here we report on a robust and high-speed rotation control in optical tweezers by using a novel linear polarization synthesis based on optical heterodyne interference between two circularly polarized lights with opposite handedness. The synthesized linear polarization can be rotated in a hopping-free scheme at arbitrary speed determined electronically by the heterodyne frequency between two laser fields. The experimental demonstration of a trapped vaterite particle in water shows that the precisely controlled rotation frequency of 300 Hz can be achieved. The proposed method will find promising applications in optically driven micro-gears, fluidic pumps and rotational micro-rheology.
Robust and high-speed rotation control in optical tweezers by using polarization synthesis based on heterodyne interference
First published at:Aug 21, 2020
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National Natural Science Foundation of China (91750203 and 91850111)
Get Citation: Liu W, Dong D S, Yang H, Gong Q H, Shi K B. Robust and high-speed rotation control in optical tweezers by using polarization synthesis based on heterodyne interference. Opto-Electron Adv 3, 200022 (2020).