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Transverse spin forces and non-equilibrium particle dynamics in a circularly polarized vacuum optical trap

  1. 1.
    SYSNO ASEP0498705
    Document TypeJ - Journal Article
    R&D Document TypeJournal Article
    Subsidiary JČlánek ve WOS
    TitleTransverse spin forces and non-equilibrium particle dynamics in a circularly polarized vacuum optical trap
    Author(s) Svak, Vojtěch (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
    Simpson, Stephen Hugh (UPT-D) RID, SAI
    Number of authors7
    Article number5453
    Source TitleNature Communications. - : Nature Publishing Group
    Roč. 9, č. 1 (2018)
    Number of pages8 s.
    Publication formPrint - P
    Languageeng - English
    CountryGB - United Kingdom
    Keywordsoptical trapping ; optical levitation ; counter-propagating beams ; optical spin force ; non-conservative force ; non-equilibrium dynamics
    Subject RIVBH - Optics, Masers, Lasers
    OECD categoryOptics (including laser optics and quantum optics)
    R&D ProjectsGB14-36681G GA ČR - Czech Science Foundation (CSF)
    LO1212 GA MŠMT - Ministry of Education, Youth and Sports (MEYS)
    Institutional supportUPT-D - RVO:68081731
    UT WOS000454137600034
    EID SCOPUS85058909640
    DOI10.1038/s41467-018-07866-8
    AnnotationWe provide a vivid demonstration of the mechanical effect of transverse spin momentum in an optical beam in free space. This component of the Poynting momentum was previously thought to be virtual, and unmeasurable. Here, its effect is revealed in the inertial motion of a probe particle in a circularly polarized Gaussian trap, in vacuum. Transverse spin forces combine with thermal fluctuations to induce a striking range of non-equilibrium phenomena. With increasing beam power we observe (i) growing departures from energy equipartition, (ii) the formation of coherent, thermally excited orbits and, ultimately, (iii) the ejection of the particle from the trap. As well as corroborating existing measurements of spin momentum, our results reveal its dynamic effect. We show how the under-damped motion of probe particles in structured light fields can expose the nature and morphology of optical momentum flows, and provide a testbed for elementary non-equilibrium statistical mechanics.
    WorkplaceInstitute of Scientific Instruments
    ContactMartina Šillerová, sillerova@ISIBrno.Cz, Tel.: 541 514 178
    Year of Publishing2019
Number of the records: 1  

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