A single vertical laser beam is used to trap SiO2 and vaterite spheres with diameters ranging from 5 to 32um. The center of mass acceleration sensitivity for the SiO2 spheres is as low as 4 × 10−7 g/Hz−1/2 for the largest spheres. This system also allows high-bandwidth modulation of the polarization of the trapping beam, enabling control of the rotation of the microspheres. The maximum rotation speeds exceed a few MHz for both types of spheres, while the damping time exceeds several hours at 2 × 10−7 mbar. This setup can be used to measure forces and torques acting on the microspheres
Fernando Monteiro, Sumita Ghosh, Elizabeth C. van Assendelft, and David Moore, "An apparatus for optical levitation of microspheres in high vacuum with rotational control," Proc. SPIE 10723, Optical Trapping and Optical Micromanipulation XV, 1072314 (Presented at SPIE Nanoscience + Engineering: August 21, 2018; Published: 7 September 2018); https://doi.org/10.1117/12.2320371.
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