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dc.contributor.authorSvak, V.
dc.contributor.authorArita, Y.
dc.contributor.authorSimpson, S. H.
dc.contributor.authorBrzobohatý, O.
dc.contributor.authorŠiler, M.
dc.contributor.authorJákl, P.
dc.contributor.authorKanka, J.
dc.contributor.authorZemánek, P.
dc.contributor.authorDholakia, K.
dc.contributor.editorAndrews, David L.
dc.contributor.editorGalvez, Enrique J.
dc.contributor.editorRubinsztein-Dunlop, Halina
dc.identifier.citationSvak , V , Arita , Y , Simpson , S H , Brzobohatý , O , Šiler , M , Jákl , P , Kanka , J , Zemánek , P & Dholakia , K 2020 , Non-conservative instabilities in optical vacuum traps . in D L Andrews , E J Galvez & H Rubinsztein-Dunlop (eds) , Complex Light and Optical Forces XIV . , 112970F , Proceedings of SPIE - The International Society for Optical Engineering , vol. 11297 , SPIE , Complex Light and Optical Forces XIV 2020 , San Francisco , United States , 4/02/20 .
dc.identifier.otherPURE: 267453748
dc.identifier.otherPURE UUID: f66de668-62fe-4f37-9144-48903f1b48e7
dc.identifier.otherScopus: 85082715265
dc.identifier.otherWOS: 000552296600008
dc.description.abstractParticles 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.
dc.relation.ispartofComplex Light and Optical Forces XIVen
dc.relation.ispartofseriesProceedings of SPIE - The International Society for Optical Engineeringen
dc.rightsCopyright © 2020 Society of Photo-Optical Instrumentation Engineers (SPIE). This work has been made available online in accordance with publisher policies or with permission. Permission for further reuse of this content should be sought from the publisher or the rights holder. This is the author created accepted manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at
dc.subjectOptical forceen
dc.subjectQC Physicsen
dc.subjectComputer Science Applicationsen
dc.subjectElectrical and Electronic Engineeringen
dc.subjectElectronic, Optical and Magnetic Materialsen
dc.subjectApplied Mathematicsen
dc.subjectCondensed Matter Physicsen
dc.titleNon-conservative instabilities in optical vacuum trapsen
dc.typeConference itemen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews.Sir James Mackenzie Institute for Early Diagnosisen
dc.contributor.institutionUniversity of St Andrews.Centre for Biophotonicsen
dc.contributor.institutionUniversity of St Andrews.Biomedical Sciences Research Complexen

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