Browsing by Author "Nic Chormaic, Síle"

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Browsing by Author "Nic Chormaic, Síle"

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  • Ward, Jonathan M.; O'Shea, Danny G.; Shortt, Brian J.; Morrissey, Michael J.; Deasy, Kieran; Nic Chormaic, Síle (American Institute of Physics, 2006-08)
    We describe a reproducible method of fabricating adiabatic tapers with 3–4 μm diameter. The method is based on a heat-and-pull rig, whereby a CO2 laser is continuously scanned across a length of fiber that is being pulled ...
  • Ward, Jonathan M.; O'Shea, Danny G.; Shortt, Brian J.; Nic Chormaic, Síle (American Institute of Physics, 2007-07-20)
    We experimentally demonstrate optical bistability in Er3+-Yb3+ phosphate glass microspheres at 295 K. Bistability is associated with both Er3+ fluorescence and lasing behavior, and chromatic switching. The chromatic switching ...
  • O'Shea, Danny G.; Ward, Jonathan M.; Shortt, Brian J.; Mortier, Michel; Féron, Patrice; Nic Chormaic, Síle (EDP Sciences, 2007-11)
    We present results on the realization of a multicolour microspherical glass light source fabricated from the erbium doped fluoride glass ZBLALiP. Whispering gallery mode lasing and upconversion processes give rise to laser ...
  • Ward, Jonathan M.; Féron, Patrice; Nic Chormaic, Síle (IEEE, 2008-03)
    We report on the realization of an integrated lasing device consisting of a microsphere optical resonator fused to a tapered optical fiber. A microsphere fabricated from Er: Yb-codoped phosphate glass is heated above its ...
  • Bandi, Thejesh N.; Minogin, V. G. (Vladimir Georgievich), 1950-; Nic Chormaic, Síle (American Physical Society, 2008-07)
    We propose and present a quantitative analysis of neutral atom microtraps based on optical near fields produced by the diffraction of a laser wave on small apertures in a thin screen. We show that near-field atom microtraps ...
  • Morrissey, Michael J.; Deasy, Kieran; Wu, Yuqiang; Chakrabarti, Shrabana; Nic Chormaic, Síle (American Institute of Physics, 2009-05-01)
    We present a novel technique for measuring the characteristics of a magneto-optical trap (MOT) for cold atoms by monitoring the spontaneous emission from trapped atoms coupled into the guided mode of a tapered optical ...
  • Ward, Jonathan M.; Wu, Yuqiang; Minogin, V. G. (Vladimir Georgievich), 1950-; Nic Chormaic, Síle (American Physical Society, 2009-05-19)
    We propose a method to spatially confine or corral the movements of a micropendulum via the optical forces produced by two simultaneously excited optical modes of a photonic molecule comprising two microspherical cavities. ...
  • Russell, Laura; Gleeson, Daniel A.; Minogin, V. G. (Vladimir Georgievich), 1950-; Nic Chormaic, Síle (Institute of Physics, 2009-09)
    We analyse the lineshape of the fluorescence emitted by a cloud of optically excited cold atoms and coupled into an optical nanofibre. We examine the efficiency of the fluorescence coupling and describe the asymmetry of ...
  • Minogin, V. G. (Vladimir Georgievich), 1950-; Nic Chormaic, Síle (MAIK Nauka/Interperiodica, 2010-01)
    We study the spontaneous emission of atoms near an optical nanofiber and analyze the coupling efficiency of the spontaneous emission into a nanofiber. We also investigate the influence of the van der Waals interaction of ...
  • Wu, Yuqiang; Ward, Jonathan M.; Nic Chormaic, Síle (American Institute of Physics, 2010-02)
    Upconversion lasing and fluorescence from active microspheres fabricated from a novel fluorozirconate, Er3+ doped glass, ZBNA (ZrF4-BaF2-NaF-AlF3), when pumped at 978 nm via a tapered optical fiber is demonstrated. An ...
  • Ward, Jonathan M.; Wu, Yuqiang; Khalfi, Krimo; Nic Chormaic, Síle (American Institute of Physics, 2010-07)
    We report on the design of an electric tube furnace that can be used for the fabrication of doped glass microsphere lasers. The tube furnace has a short hot zone of length 133 mm and is based on a quartz tube design. Doped ...
  • Ward, Jonathan M.; Nic Chormaic, Síle (Springer, 2010-08-07)
    We demonstrate an all-optical, thermally assisted technique for broad-range tuning of whispering gallery modes in microsphere resonators fabricated from an Er:Yb co-doped phosphate glass (IOG-2). The microspheres are pumped ...
  • Watkins, Amy Marie (University College Cork, 2013)
    In this thesis, the evanescent field sensing techniques of tapered optical nanofibres and microspherical resonators are investigated. This includes evanescent field spectroscopy of a silica nanofibre in a rubidium vapour; ...
  • Russell, Laura (University College Cork, 2013)
    In this thesis, a magneto-optical trap setup is used to laser cool and confine a cloud of 85Rb. The cloud typically contains 108 atoms in a 1 mm3 volume at a temperature in the region of the Doppler Limit (146 _K for 85Rb). ...