Show simple item record

Files in this item


Item metadata

dc.contributor.advisorDholakia, Kishan
dc.contributor.authorGherardi, David Mark
dc.description.abstractLight can exert optical forces on matter. In the macroscopic world these forces are minuscule, but on the microscopic or atomic scale, these forces are large enough to trap and manipulate particles. They may even be used to cool atoms to a fraction of a degree above absolute zero. This thesis details a number of experiments concerned with the optical manipulation of atoms and micron-size particles using free space light beams and photonic crystal fibres. Two atom guiding experiments are described. In the first experiment, a spatial light modulator is used to generate higher blue-detuned azimuthal Laguerre-Gaussian LG) beams, which are annular beams with a hollow core. These LG beams are then used to guide laser cooled rubidium-85 atoms within the dark core over a distance of 30 mm. The second atom guiding experiment involves attempting to guide laser cooled and thermal rubidium atoms through a hollow-core photonic crystal fibre using red-detuned light. Hollow-core photonic crystal fibres are fibres that are able to guide light with low attenuation within a hollow core. For this experiment a hot wire detection system was designed, along with a number of complex vacuum systems. The first dual-beam fibre trap for micron-size particles constructed using endlessly single-mode photonic crystal fibre (ESM-PCF) is described. The characteristics of dual-beam fibre traps are governed by the fibres used. As ESM-PCF has considerably different properties in comparison to conventional single- or multimode fibres, this dual beam ESM-PCF trap exhibits some novel characteristics. I show that the dual beam ESM-PCF trap can form trapping, repulsive and line potentials; an interference-free ‘white light’ trap; and a dual-wavelength optical conveyor belt.en
dc.format.extent25295281 bytes
dc.publisherUniversity of St Andrews
dc.subjectOptical manipulationen
dc.subjectPhotonic crystal fibreen
dc.subjectAtom guidingen
dc.subjectLarge mode area fibreen
dc.subjectSpatial light modulatoren
dc.subjectLaguerre- Gaussianen
dc.subjectLaser coolingen
dc.subjectEndlessly single-mode photonic crystal fibreen
dc.subjectWhite lighten
dc.subjectDual-beam fibre trapen
dc.subjectOptical conveyor belten
dc.subjectOptical fibreen
dc.subjectHot-wire detectoren
dc.subjectHollow-core photonic crystal fibreen
dc.subjectPhotonic bandgap fibreen
dc.titleStudies of particle and atom manipulation using free space light beams and photonic crystal fibresen
dc.type.qualificationnamePhD Doctor of Philosophyen
dc.publisher.institutionThe University of St Andrewsen

This item appears in the following Collection(s)

Show simple item record