1Univ. of St. Andrews (United Kingdom) 2Chiba Univ. (Japan) 3Institute of Scientific Instruments of the CAS, v.v.i. (Czech Republic) 4Chiba University (Japan) 5Yonsei Univ. (Korea, Republic of)
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In optical tweezers, reductions in the symmetry of the particle or trapping field introduce nonconservative optical forces, producing a variety of nonequilibrium effects. Here we show nonconservative optical traps in a vacuum using birefringent microspheres in linearly polarised (LP) and circularly polarised (CP) Gaussian beams. Coherent and self-sustained oscillations emerge in LP due to nonsymmetric coupling between rotational and translational degrees of freedom, while stochastic orbital rotation and coherent limit cycles arise in CP about the beam axis. These nonconservative effects play a critical role in the rotational dynamics of a levitated birefringent microsphere.
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Yoshihiko Arita, Stephen Simpson, Graham Bruce, Pavel Zemánek, Kishan Dholakia, "Nonconservative levitated optomechanics," Proc. SPIE PC12198, Optical Trapping and Optical Micromanipulation XIX, PC121980Y (3 October 2022); https://doi.org/10.1117/12.2635918