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Non-conservative instabilities in optical vacuum traps
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SYSNO ASEP 0532398 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Non-conservative instabilities in optical vacuum traps Author(s) Svak, Vojtěch (UPT-D) RID, SAI
Arita, Y. (GB)
Simpson, Stephen Hugh (UPT-D) RID, SAI
Brzobohatý, Oto (UPT-D) RID, ORCID, SAI
Šiler, Martin (UPT-D) RID, ORCID, SAI
Jákl, Petr (UPT-D) RID, ORCID, SAI
Kaňka, Jan (UPT-D) RID, SAI
Zemánek, Pavel (UPT-D) RID, SAI, ORCID
Dholakia, K. (GB)Number of authors 9 Article number 112970F Source Title Complex Light and Optical Forces XIV. Proceedings of SPIE, 11297. - Bellingham : SPIE, 2020 - ISSN 0277-786X - ISBN 978-1-5106-3358-2 Series Proceedings of SPIE Number of pages 6 s. Publication form Print - P Action Conference on Complex Light and Optical Forces /14./ Event date 04.02.2020 - 05.02.2020 VEvent location San Francisco Country US - United States Event type WRD Language eng - English Country US - United States Keywords optical force ; spin ; birefringence ; instability Subject RIV BH - Optics, Masers, Lasers OECD category Optics (including laser optics and quantum optics) R&D Projects GA19-17765S GA ČR - Czech Science Foundation (CSF) Institutional support UPT-D - RVO:68081731 UT WOS 000552296600008 EID SCOPUS 85082715265 DOI 10.1117/12.2545948 Annotation Particles held in optical tweezers are commonly thought to be at thermodynamic equilibrium with their environment. Under this assumption the elastic energy of the trap is equal to the thermal energy. As a result the variance of the particle position is completely independent of viscosity and inversely proportional to the optical power in the trap. Here we show that these conditions only hold for very high symmetry cases e.g. perfectly spherical particles in unaberrated, linearly polarized Gaussian traps. Here we show that any reduction in symmetry leads to asymmetrically coupled degrees of freedom. The associated force field is linearly non-conservative and the tweezer is no longer at equilibrium. In overdamped systems the effect is a underlying systematic bias to the Brownian motion. In underdamped systems, this systematic component can accumulate momentum, eventually destabilizing the trap. We illustrate this latter effect with reference to two systems, (i) an isotropic sphere in a circularly polarized trap, and (ii) a birefringent sphere in a linearly polarized trap. In both cases the instability can be approached either by decreasing air pressure or by increasing optical power. Close to instability, the trapped particle executes increasingly coherent motion that is highly sensitive to external perturbations. Potential applications to weak force sensing are discussed. Workplace Institute of Scientific Instruments Contact Martina Šillerová, sillerova@ISIBrno.Cz, Tel.: 541 514 178 Year of Publishing 2021
Number of the records: 1