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dc.contributor.authorChen, Mingzhou
dc.contributor.authorMazilu, Michael
dc.contributor.authorArita, Yoshihiko
dc.contributor.authorWright, Ewan M.
dc.contributor.authorDholakia, Kishan
dc.contributor.editorDholakia, K
dc.contributor.editorSpalding, GC
dc.date.accessioned2015-03-19T12:01:03Z
dc.date.available2015-03-19T12:01:03Z
dc.date.issued2014-09-16
dc.identifier175309593
dc.identifiera653151a-99fe-4bb9-8d03-80a2a2b7b487
dc.identifier000349300600011
dc.identifier84937948405
dc.identifier000349300600011
dc.identifier.citationChen , M , Mazilu , M , Arita , Y , Wright , E M & Dholakia , K 2014 , Optical trapping with a perfect vortex beam . in K Dholakia & GC Spalding (eds) , Optical Trapping and Optical Micromanipulation XI . Proceedings of SPIE , vol. 9164 , SPIE , Bellingham , Conference on Optical Trapping and Optical Micromanipulation XI , Canada , 17/08/14 . https://doi.org/10.1117/12.2064080en
dc.identifier.citationconferenceen
dc.identifier.issn0277-786X
dc.identifier.otherORCID: /0000-0002-6190-5167/work/47136396
dc.identifier.urihttps://hdl.handle.net/10023/6262
dc.descriptionThe authors would like to thank the UK Engineering and Physical Sciences Research Council (EPSRC) for funding.en
dc.description.abstractVortex beams with different topological charge usually have different profiles and radii of peak intensity. This introduces a degree of complexity the fair study of the nature of optical OAM (orbital angular momentum). To avoid this, we introduced a new approach by creating a perfect vortex beam using an annular illuminating beam with a fixed intensity profile on an SLM that imposes a chosen topological charge. The radial intensity profile of such an experimentally created perfect vortex beam is independent to any given integer value of its topological charge. The well-defined OAM density in such a perfect vortex beam is probed by trapping microscope particles. The rotation rate of a trapped necklace of particles is measured for both integer and non-integer topological charge. Experimental results agree with the theoretical prediction. With the flexibility of our approach, local OAM density can be corrected in situ to overcome the problem of trapping the particle in the intensity hotspots. The correction of local OAM density in the perfect vortex beam therefore enables a single trapped particle to move along the vortex ring at a constant angular velocity that is independent of the azimuthal position. Due to its particular nature, the perfect vortex beam may be applied to other studies in optical trapping of particles, atoms or quantum gases.
dc.format.extent5
dc.format.extent522581
dc.language.isoeng
dc.publisherSPIE
dc.relation.ispartofOptical Trapping and Optical Micromanipulation XIen
dc.relation.ispartofseriesProceedings of SPIEen
dc.subjectOptical Trappingen
dc.subjectperfect vortexen
dc.subjectOrbital Angular Momentum (OAM)en
dc.subjectOrbital angular-momentumen
dc.subjectModesen
dc.subjectLighten
dc.subjectQC Physicsen
dc.subject.lccQCen
dc.titleOptical trapping with a perfect vortex beamen
dc.typeConference itemen
dc.contributor.sponsorEPSRCen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews. Biomedical Sciences Research Complexen
dc.identifier.doihttps://doi.org/10.1117/12.2064080
dc.identifier.grantnumberEP/J01771X/1en


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