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dc.contributor.authorTkachenko, Georgiy
dc.contributor.authorStellinga, Daan
dc.contributor.authorRuskuc, Andrei
dc.contributor.authorChen, Mingzhou
dc.contributor.authorDholakia, Kishan
dc.contributor.authorKrauss, Thomas F.
dc.identifier.citationTkachenko , G , Stellinga , D , Ruskuc , A , Chen , M , Dholakia , K & Krauss , T F 2018 , ' Optical trapping with planar silicon metalenses ' , Optics Letters , vol. 43 , no. 14 , pp. 3224-3227 .
dc.identifier.otherPURE: 253395271
dc.identifier.otherPURE UUID: 3ee83521-5e8c-4503-b0ec-7b75445bad08
dc.identifier.otherScopus: 85049866623
dc.identifier.otherORCID: /0000-0002-6190-5167/work/47136393
dc.identifier.otherWOS: 000438867400007
dc.descriptionWe thank the UK Engineering and Physical Sciences Research Council for funding from grants EP/J01771X/1 and EP/P030017/1.en
dc.description.abstractContactless manipulation of micron-scale objects in a microfluidic environment is a key ingredient for a range of applications in the biosciences, including sorting, guiding, and analysis of cells and bacteria. Optical forces are powerful for this purpose but, typically, require bulky focusing elements to achieve the appropriate optical field gradients. To this end, realizing the focusing optics in a planar format would be very attractive and conducive to the integration of such microscale devices, either individually or as arrays. Here we report on, to the best of our knowledge, the first experimental demonstration of optical trapping using planar silicon metalenses illuminated with a collimated laser beam. The structures consist of high-contrast gratings with a locally varying period and duty cycle. They are designed to mimic parabolic reflectors with a numerical aperture of 0.56 at a vacuum wavelength of 1064 nm. We achieve both two- and three-dimensional trapping in water, with the latter realized by omitting the central Fresnel zones. This Letter highlights the versatility of such lithographically defined metastructures for exerting optical forces without the need for traditional optical elements.
dc.relation.ispartofOptics Lettersen
dc.rights© 2018 Optical Society of America. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at
dc.subjectQC Physicsen
dc.titleOptical trapping with planar silicon metalensesen
dc.typeJournal articleen
dc.contributor.institutionUniversity of St Andrews.School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews.Biomedical Sciences Research Complexen
dc.description.statusPeer revieweden

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