Particle manipulation using ultrathin optical fibres

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dc.contributor.advisor Nic Chormaic, Síle en
dc.contributor.advisor Callanan, Paul en Maimaiti, Aili 2017-05-19T09:35:01Z 2017-05-19T09:35:01Z 2017 2017
dc.identifier.citation Maimaiti, A. 2017. Particle manipulation using ultrathin optical fibres. PhD Thesis, University College Cork. en
dc.description.abstract Optical manipulation in the vicinity of ultrathin optical fibres has shown potential across several fields including control and delivery of dielectric, metallic and biological microscopic objects, and cold atom probing and trapping. The unique properties of ultrathin fibres, such as strong field confinement, large evanescent fields in the transverse plane, and interaction lengths greater than the Rayleigh range, are key factors needed for the study of fibre-based lightmatter interactions. Differences in the evanescent fields between the various tapered fibre modes give rise to differing interactions with particles. In this thesis, we studied the propulsion of polystyrene particles (diameters of 1 μm ~ 5 μm) in the evanescent field of higher order modes and the fundamental mode in aqueous solutions. For a power of 25 mW, particles were propelled eight times faster in the case of the higher order modes when compared to the fundamental mode. The dependency of particle speed on particle type was also investigated. We further explored the longitudinal optical binding interactions of chains of 3 μm polystyrene spheres in the evanescent fields of the fundamental and the higher order modes of a microfibre. Using a theoretical model based on a scattering-matrix approach, the optical forces, optical binding interactions, and the velocity of bounded particle chains were calculated and compared with experimental observations. Additionally, we examined the transfer of angular momentum of the fundamental mode and the higher order modes of a microfibre on polystyrene microparticles. For a fundamental mode with circular polarisation, the transfer of spin angular momentum was evident via the rotation of particles around the fibre. Furthermore, we investigated the angular momentum of selectively excited higher order modes and its transfer to trapped particles. The results are useful in understanding the evanescent behaviour of different tapered fibre modes. en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher University College Cork en
dc.rights © 2017, Aili Maimaiti. en
dc.rights.uri en
dc.subject Optical trapping en
dc.subject Tapered fibre en
dc.subject Fibre modes en
dc.subject Angular momentum en
dc.subject Higher order modes en
dc.subject Evanscent fields en
dc.title Particle manipulation using ultrathin optical fibres en
dc.type Doctoral thesis en
dc.type.qualificationlevel Doctoral en
dc.type.qualificationname PhD (Science) en
dc.internal.availability Full text not available en No embargo required en
dc.description.version Accepted Version
dc.contributor.funder Okinawa Institute of Science and Technology Graduate University en
dc.description.status Not peer reviewed en Physics en
dc.check.type No Embargo Required
dc.check.reason No embargo required en
dc.check.opt-out Yes en
dc.thesis.opt-out true
dc.check.embargoformat Not applicable en
dc.internal.conferring Summer 2017 en

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© 2017, Aili Maimaiti. Except where otherwise noted, this item's license is described as © 2017, Aili Maimaiti.
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