Louise Bradley
Trinity College Dublin, School of Physics, Faculty Member
- Prof. Louise Bradley leads a research team in Nanophotonics and Plasmonics in Trinity College Dublin. She is also a p... moreProf. Louise Bradley leads a research team in Nanophotonics and Plasmonics in Trinity College Dublin. She is also a principal investigator in the Science Foundation Ireland funded research centres, Irish Photonics Integration Centre (IPIC) and Advanced Material and Bio-Engineering Research (AMBER).edit
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Research Interests: Materials Science, Optics, Nonlinear Optics, Optical Communication, Optoelectronics, and 15 morePhotodetectors, IEEE, Absorption, Chromatic aberration, Aggregate, Optical physics, Photodetector, Optical telecommunication, Light absorption, Non Linear Optics, Optical Filters, Bandwidth, Electrical And Electronic Engineering, Gaussian Pulse, and Chromatic Dispersion
... Paul J. Maguire 1 , Liam P. Barry 1 , T. Krug 2 , M. Lynch 2 , AL Bradley 2 , JF Donegan ... de Rennes Ecole Nationale Supérieure des Sciences Appliquées et de Technologie Institut Télécom Télécom Bretagne Université... more
... Paul J. Maguire 1 , Liam P. Barry 1 , T. Krug 2 , M. Lynch 2 , AL Bradley 2 , JF Donegan ... de Rennes Ecole Nationale Supérieure des Sciences Appliquées et de Technologie Institut Télécom Télécom Bretagne Université européenne de Bretagne. ... hal-00022998, version 1. ...
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Research Interests: Chemical Engineering, Materials Science, Medical Imaging, Fiber Optics, Nonlinear Optics, and 15 moreOptical Communication, Optical Switch, Optical switching, Lasers, Optical, Light, Implementation, Optical physics, Optical telecommunication, Optical Amplifier, Gain, Optical Switches, Electrical And Electronic Engineering, Optical Rotation, and Cross polarization
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A pump-probe experimental investigation of non-linear polarisation effects in a semiconductor optical amplifier is undertaken, in both the continuous wave and pulsed regimes.
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A simple experimental method for determining the number of modes in planar dielectric multi-mode waveguides, and the effective index difference of these modes, is presented. Applying a thin, dye-doped polymer cladding, the fluorescence... more
A simple experimental method for determining the number of modes in planar dielectric multi-mode waveguides, and the effective index difference of these modes, is presented. Applying a thin, dye-doped polymer cladding, the fluorescence excited by multiple modes propagating in a silicon nitride slab waveguide is imaged to extract information. Interference between the modes produces a structured intensity profile along the waveguide which is constant in time. The spatial frequencies of this intensity profile are directly linked to the propagation constants of the underlying modes. Through a discrete Fourier transform, the modes' effective index differences are found and compare well with analytically calculated values. Furthermore, the amplitudes in the Fourier transform are directly related to the power in each mode. Comparing the amplitudes of the Fourier components as a function of propagation distance, an estimate of the propagation losses of the individual modes relative to one another is made. The method discussed could be applied to analysing mode behaviour in integrated photonic devices, most notably in mode-division multiplexing.
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ABSTRACT Two Michelson fiber interferometers were used to measure the in-band OSNR of a noisy signal between 5 and 30dB within ±0.5dB without prior knowledge of the noise-free extinction ratio of the signal.
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Research Interests: Materials Science, Chemistry, Crystal Growth, Doping, Photoluminescence, and 13 moreWide Band-gap Semiconductor, Thin Film, Cathodoluminescence, Band Gap, X ray diffraction, Crystal, Room Temperature, Electrical Properties, Binding Energy, Low Temperature, Lattice Constant, Exciton, and Light Emitting Diode
We have probed the luminescence properties of a wide-band-gap, direct band-gap optoelectronic material, grown on closely lattice-matched silicon substrates, namely, γ-CuCl on Si. This material system is compatible with current Si or... more
We have probed the luminescence properties of a wide-band-gap, direct band-gap optoelectronic material, grown on closely lattice-matched silicon substrates, namely, γ-CuCl on Si. This material system is compatible with current Si or GaAs-based electronic/optoelectronic technologies. Polycrystalline epitaxy of CuCl can be controlled such that it maintains an orientation similar to the underlying Si substrate. Importantly, chemical interactions between CuCl and Si are eliminated. Photoluminescence and cathodoluminescence results for CuCl, deposited on either Si (100) or Si (111), reveal a strong room-temperature Z3 excitonic emission at ∼387nm. We have developed and demonstrated the room-temperature operation of an ultraviolet electroluminescent device fabricated by the growth of γ-CuCl on Si. The application of an electrical potential difference across the device results in an electric field, which promotes light emission through hot-electron impact excitation of electron-hole pairs ...
Research Interests: Engineering, Materials Science, Applied Physics, Photoluminescence, Optoelectronics, and 15 moreMathematical Sciences, Applied, Cathodoluminescence, Physical sciences, Band Gap, Luminescence, Room Temperature, Binding Energy, Epitaxy, Electron Impact Ionization, Chemical Elements, Electroluminescence, Electric Field, Charge recombination, and Mean Free Path
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An in-band optical signal-to-noise ratio (OSNR) monitoring technique based on a Michelson fiber interferometer and a linear polarizer is presented in this letter. OSNR values of up to $25\pm 0.5~{\rm dB}$ were measured for 10-G... more
An in-band optical signal-to-noise ratio (OSNR) monitoring technique based on a Michelson fiber interferometer and a linear polarizer is presented in this letter. OSNR values of up to $25\pm 0.5~{\rm dB}$ were measured for 10-G nonreturn-to-zero-differential phase-OOK (NRZ-OOK) and NRZ-differential phase-shift keyed (NRZ-DPSK) signals without prior knowledge of the signal coherence properties. Measurements were also carried out with signals having
Research Interests: Physics, Optics, Semiconductor Devices, Interferometry, Long-baseline optical interferometry, and 10 morePrior Knowledge, Optical physics, Optical fiber, Optical Fiber Communication, Optical Signal to Noise Ratio, Signal to Noise Ratio, Electrical And Electronic Engineering, Chromatic Dispersion, Optical interferometry, and Polarizer
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In this letter, a novel method of chromatic dispersion monitoring via two-photon absorption (TPA) is investigated. A specially designed semiconductor microcavity is employed as a TPA detector for monitoring data signals operating at rates... more
In this letter, a novel method of chromatic dispersion monitoring via two-photon absorption (TPA) is investigated. A specially designed semiconductor microcavity is employed as a TPA detector for monitoring data signals operating at rates up to80 Gb/s. As the microcavity has a wavelength-dependent response,a single device can be used to monitor multiple channels in a multiwavelength optical telecommunication system
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We report highly efficient Forster resonance energy transfer between CdTe nanocrystals and two different dyes, Rhodamine B and Oxazine, where the nanocrystals are mixed with the dyes on top of glass substrates. A faster NC decay curve is... more
We report highly efficient Forster resonance energy transfer between CdTe nanocrystals and two different dyes, Rhodamine B and Oxazine, where the nanocrystals are mixed with the dyes on top of glass substrates. A faster NC decay curve is observed in the samples containing NCs mixed with dyes than in those containing NCs on their own. For the samples containing nanocrystals mixed with Rhodamine B, room temperature PL measurements are presented as a function of the ratio between the amount of acceptors and the amount of donors, CA/CD. This ratio is varied between 0.03 and 5. The strongest enhancement of the acceptor PL intensity relative to that of the donor PL intensity is reached for 0.2 < CA/CD < 5, suggesting that most efficient FRET is also achieved in this region
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ABSTRACT By incorporating a semiconductor microcavity device, a highly-efficient two-photon absorption based sampling system, with a system sensitivity of 0.009 mW2 and temporal resolution &lt;500 fs is presented.
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ABSTRACT This paper investigates the use of a two-photon absorption photodetector for all-optical signal processing. Continuous, wavelength selective chromatic dispersion monitoring in a high-speed multi-wavelength system is discussed.... more
ABSTRACT This paper investigates the use of a two-photon absorption photodetector for all-optical signal processing. Continuous, wavelength selective chromatic dispersion monitoring in a high-speed multi-wavelength system is discussed. The reduction of multiple access interference in an optical code division multiple access network using a TPA photodetector is also presented.
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... these are unaffected by the addition of the wavelength switching functionality, ie linewidth ... The second part of this study attempts to model microlens surface profiles are ... preparation technique were measured using both direct... more
... these are unaffected by the addition of the wavelength switching functionality, ie linewidth ... The second part of this study attempts to model microlens surface profiles are ... preparation technique were measured using both direct and alternating current measurement techniques and ...