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15 June 2020 Coherent oscillations of a birefringent microsphere in vacuum optical traps
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Proceedings Volume 11522, Optical Manipulation and Structured Materials Conference 2020; 115221C (2020) https://doi.org/10.1117/12.2573530
Event: SPIE Technologies and Applications of Structured Light, 2020, Yokohama, Japan
Abstract
When particles are held in optical tweezers, we assume that they are in thermal equilibrium, in which the equipartition of energy determines the position variance of optically trapped spheres. Here we show that this condition only holds for very high symmetry cases, e.g. perfectly isotropic particles in unaberrated, linearly polarized Gaussian traps. We report an experimental observation 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 mechanical quality factor > 2 x 108, which can be highly sensitive to external purtabations.
© (2020) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yoshihiko Arita, Stephen H. Simpson, Pavel Zemánek, and Kishan Dholakia "Coherent oscillations of a birefringent microsphere in vacuum optical traps", Proc. SPIE 11522, Optical Manipulation and Structured Materials Conference 2020, 115221C (15 June 2020); https://doi.org/10.1117/12.2573530
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