Nonlinear optics with cold Rb atoms using tapered optical nanofibres

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dc.contributor.advisor Nic Chormaic, Síle en
dc.contributor.advisor Callanan, Paul en
dc.contributor.author Kumar, Ravi
dc.date.accessioned 2016-07-15T09:09:54Z
dc.date.issued 2015
dc.date.submitted 2015
dc.identifier.citation Kumar, R. 2015. Nonlinear optics with cold Rb atoms using tapered optical nanofibres. PhD Thesis, University College Cork. en
dc.identifier.endpage 183 en
dc.identifier.uri http://hdl.handle.net/10468/2885
dc.description.abstract Optical nanofibres (ONFs) are very thin optical waveguides with sub-wavelength diameters. ONFs have very high evanescent fields and the guided light is confined strongly in the transverse direction. These fibres can be used to achieve strong light-matter interactions. Atoms around the waist of an ONF can be probed by collecting the atomic fluorescence coupling or by measuring the transmission (or the polarisation) of the probe beam sent through it. This thesis presents experiments using ONFs for probing and manipulating laser-cooled 87Rb atoms. As an initial experiment, a single mode ONF was integrated into a magneto-optical trap (MOT) and used for measuring the characteristics of the MOT, such as the loading time and the average temperature of the atom cloud. The effect of a near-resonant probe beam on the local temperature of the cold atoms has been studied. Next, the ONF was used for manipulating the atoms in the evanescent fields region in order to generate nonlinear optical effects. Four-wave mixing, ac Stark effect (Autler-Townes splitting) and electromagnetically induced transparency have been observed at unprecedented ultralow power levels. In another experiment, a few-mode ONF, supporting only the fundamental mode and the first higher order mode group, has been used for studying cold atoms. A higher pumping rate of the atomic fluorescence into the higher order fibreguided modes and more interactions with the surrounding atoms for higher order mode evanescent light, when compared to signals for the fundamental mode, have been identified. The results obtained in the thesis are particularly for a fundamental understanding of light-atom interactions when atoms are near a dielectric surface and also for the development of fibre-based quantum information technologies. Atoms coupled to ONFs could be used for preparing intrinsically fibre-coupled quantum nodes for quantum computing and the studies presented here are significant for a detailed understanding of such a system. en
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.publisher University College Cork en
dc.rights © 2015, Ravi Kumar. en
dc.rights.uri http://creativecommons.org/licenses/by-nc-nd/3.0/ en
dc.subject Nanofibre en
dc.subject Laser cooling and trapping en
dc.subject Atomic physics en
dc.subject Spectroscopy of atoms en
dc.title Nonlinear optics with cold Rb atoms using tapered optical nanofibres en
dc.type Doctoral thesis en
dc.type.qualificationlevel Doctoral en
dc.type.qualificationname PhD (Science) en
dc.internal.availability Full text available en
dc.description.version Accepted Version
dc.contributor.funder Okinawa Institute of Science and Technology Graduate University, Japan en
dc.description.status Not peer reviewed en
dc.internal.school Physics en
dc.internal.school Tyndall National Institute en
dc.check.reason This thesis is due for publication or the author is actively seeking to publish this material en
dc.check.opt-out Not applicable en
dc.thesis.opt-out false
dc.check.chapterOfThesis 5
dc.check.embargoformat E-thesis on CORA only en
ucc.workflow.supervisor sile.nicchormaic@oist.jp
dc.internal.conferring Spring 2016 en


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