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22 August 2020 Coherent oscillations of an optically levitated birefringent microsphere in vacuum
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Abstract
When particles are held in optical tweezers, we assume that they are in thermal equilibrium. Here we show that this condition only holds for high symmetry cases, e.g. perfectly isotropic particles in unaberrated, linearly polarized Gaussian traps. We show both experimentally and theoretically that when a birefringent microsphere is held in a linearly polarised Gaussian optical trap in vacuum, spontaneous oscillations emerge that grow rapidly in amplitude and become increasingly coherent as the air pressure is reduced. Furthermore, when parametrically driven, these self-sustained oscillators exhibit an ultrahigh quality factor exceeding 200 million, which can be highly sensitive to external perturbations.
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© (2020) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yoshihiko Arita, Stephen Simpson, Pavel Zemánek, and Kishan Dholakia "Coherent oscillations of an optically levitated birefringent microsphere in vacuum", Proc. SPIE 11463, Optical Trapping and Optical Micromanipulation XVII, 114631W (22 August 2020); https://doi.org/10.1117/12.2570854
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