Browsing by Author "Bradley, Louise"
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3.8 dB Noise figure in bulk semiconductor optical amplifier
Bradley, Louise (2013)The present paper reports numerical and experimental investigation of noise figure of a multi-section semiconductor optical amplifier. The designed amplifier shows a 3.8dB noise figure, which seems to be the lowest figure ... -
Ag colloids and arrays for plasmonic non-radiative energy transfer from quantum dots to a quantum well
Bradley, Louise (2017)Non-radiative energy transfer (NRET) can be an efficient process of benefit to many applications including photovoltaics, sensors, light emitting diodes and photodetectors. Combining the remarkable optical properties of ... -
Ag nanoparticle decorated graphene oxide: Fluorescence quenching and surface enhanced raman scattering
Mc Cabe, Eithne; Bradley, Louise; Blau, Werner (2016)The emission and Raman scattering properties of three dyes, Rhodamine 6G (R6G), Rhodamine B (RhB) and Sulforhodamine 101 (SR101), were characterised on graphene oxide (GO) and Ag nanoparticle (NP) decorated graphene oxide ... -
All-Ireland Health Data Inventory. Part 1: Metadata for key data sources
Balanda, Kevin P.; Graham, Adele; Bradley, Louise; Klein, Ulrike (Institute of Public Health in Ireland, ireland, 2007) -
All-optical pulse processing for advanced photonic communication system
Donegan, John; Bradley, Louise (IEEE, 2008)This paper investigates the use of a Two-Photon Absorption photodetector for high speed processing of ultrashort optical pulses in advanced photonic communication systems. Specifically the paper describes how the Two-Photon ... -
All-optical sampling based on two-photon absorption in a semiconductor microcavity for high-speed OTDM
Donegan, John; Bradley, Louise (SPIE, 2005)Future high-speed optical communications networks operating at data rates in excess of 100Gbit/s per channel will require a sensitive and ultrafast technique for precise optical signal monitoring.1 The standard way ... -
Carrier density dependence of plasmonenhanced nonradiative energy transfer in a hybrid quantum well-quantum dot structure
Bradley, Louise (2015)An array of Ag nanoboxes fabricated by helium-ion lithography is used to demonstrate plasmon-enhanced nonradiative energy transfer in a hybrid quantum well-quantum dot structure. The nonradiative energy transfer, from an ... -
Characterisation of n-type γ-CuCl on Si for UV optoelectronic applications
Bradley, Louise (2007)The use of co-evaporation of ZnCl2 with CuCl in order to achieve n-type conductivity in CuCl is reported herein. Linear current–voltage (IV) characteristics in the range of ±4 V have been measured using Cu–Au electrical ... -
Characterization of a multi-electrode bulk-SOA for low NF in-line amplification in passive optical networks
Bradley, Louise (2010)A bulk semiconductor optical amplifier (SOA) utilizing a multi-contact biasing method is characterized as a function of the bias current supplied to each section Firstly, amplified spontaneous emission spectra and ... -
Chiral Ag nanostructure arrays as optical antennas
Bradley, Louise (2015)Directional and circularly polarised emission from quantum dots coupled with chiral Ag nanostructures has been demonstrated. Semiconductor quantum dots were deposited onto the chiral structures using the Layer-by-Layer ... -
Chromatic dispersion monitoring for high-speed WDM systems using two-photon absorption in a semiconductor microcavity
Donegan, John; Bradley, Louise (2009)This paper presents a theoretical and experimental investigation into the use of a two-photon absorption (TPA) photodetector for use in chromatic dispersion (CD) monitoring in high-speed, WDM network. In order to overcome ... -
Chromatic dispersion monitoring of 80 Gbps OTDM data signal via two-photon absorption in a semiconductor microcavity
Donegan, John; Bradley, Louise (2007)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 ... -
Collisional Broadening of Semiconductor Microcavity Polaritons
Donegan, John; Bradley, Louise; Hegarty, John (2002)We measure the effect of intensity on the homogeneous linewidth of two high finesse semiconductor microcavities in the strong coupling regime using degenerate four‐wave mixing. We find that the collisional broadening due ... -
Concentration dependence of Forster resonant energy transfer between donor and acceptor nanocrystal quantum dot layers: Effect of donor-donor interactions
Gounko, Iouri; Bradley, Louise (2011)The influences of donor and acceptor concentrations on Forster resonant energy transfer (FRET) in a separated donor-acceptor quantum dot bilayer structure have been investigated. Donor intra-ensemble energy transfer is ... -
Confined optical modes in small photonic molecules with semiconductor nanocrystals
Donegan, John; Bradley, Louise (2004)We report on the coherent coupling of whispering gallery modes (WGMs) in a photonic molecule formed from two melamine-formaldehyde spherical microcavities coated with a thin shell of light-emitting CdTe nanocrystals ... -
Constructive and destructive interference of Kerker-type scattering in an ultrathin silicon Huygens metasurface
Bradley, Louise; Donegan, John (2020)High refractive index dielectric nanoparticles have provided a new platform for exotic light manipulation through the interference of multipole modes. The Kerker effect is one example of a Huygens source design. Rather ... -
Coupled cavity modes in photonic molecules with semiconductor nanocrystals
Donegan, John; Bradley, Louise (2005)We present a detailed study of the localized coupled-cavity modes in a photonic molecule formed from two dielectric spherical microcavities with CdTe nanocrystals, which show a multi-peak narrowband modal structure resulting ... -
Decay Rates near layers of Au Nanospheres
Bradley, Louise (2012)The decay rate of quantum emitters near a layer of Au nanospheres is studied in the framework of a Green’s tensor formalism. The localized surface plasmons that can be excited on the gold spheres provide a strong avenue for ... -
Dependence of Photocurrent Enhancements in Hybrid Quantum Dot-MoS2 Devices on Quantum Dot Emission Wavelength
Bradley, Louise; Mc Evoy, Niall; Mc Closkey, David; Duesberg, Georg (2019)The spectral dependence of nonradiative energy transfer (NRET) from three spectrally different quantum dot (QD) ensembles to monolayer MoS2 is reported. The QDs with peak emission wavelengths of 450, 530, and 630 nm induce ... -
Dependence of Photocurrent Enhancements in Quantum Dot (QD)-Sensitized MoS2 Devices on MoS2 Film Properties
Mc Evoy, Niall; Coleman, Jonathan; Mc Closkey, David; Bradley, Louise; Duesberg, Georg (2018)This report demonstrates highly efficient nonradiative energy transfer (NRET) from alloyed CdSeS/ZnS semiconductor nanocrystal quantum dots (QDs) to MoS2 films of varying layer thicknesses, including pristine monolayers, ...