Physics (Scholarly Publications): Recent submissions
Now showing items 301-320 of 1742
-
Collisional Broadening of Semiconductor Microcavity Polaritons
(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 ... -
Investigation of optimum wavelength converter based on nonlinear polarization rotation in a bulk SOA
(2007)This work is focused on understanding and optimising the physical mechanisms responsible for wavelength conversion based on cross-polarisation modulation (XPolM) in a bulk semiconductor optical amplifier. A comparison is ... -
Evaluation of the chemical, electronic and optoelectronic properties of γ-CuCl thin films and their fabrication on Si substrates
(2007)CuCl is a I–VII semiconductor material with a direct band gap of ~3.4 eV. It exhibits a zincblende structure (γ-phase) at low temperatures, up to ~680 K. Unlike GaN, ZnO and related materials, CuCl has a relatively low ... -
Emission Properties of Colloidal Quantum Dots on Polyelectrolyte Multilayers
(2006)We present steady state and time-resolved photoluminescence (PL) characteristics of differently charged CdTe quantum dots (QDs) adsorbed onto a polyelectrolyte (PE) multilayer. The PE multilayer is built up using a ... -
OSNR monitoring using two fiber interferometers
(2010)In-band OSNR from 5 to 30 dB of a single 10 G NRZ-OOK channel was measured by two fiber interferometers within an accuracy of ±0.5 dB without requirement for knowledge of the noise-free extinction ratio of the signal. -
Nonlinear reflectivity of semiconductor microcavities in the weak- and strong-coupling regimes: Experiment and theory
(1998)We use an entirely classical model to describe the nonlinear properties of semiconductor microcavities in both the weak- and strong-coupling regimes, as measured in a series of spectrally and temporally resolved pump-probe ... -
Emission Properties of Colloidal Quantum Dots on Polyelectrolyte Multilayers
(2006)We present steady state and time-resolved photoluminescence (PL) characteristics of differently charged CdTe quantum dots (QDs) adsorbed onto a polyelectrolyte (PE) multilayer. The PE multilayer is built up using a ... -
Modelling of Extraction Efficiency of GaN-Based Resonant Cavity Light Emitting Diodes Emitting at 510 nm
(2002)The design of GaN resonant cavity light emitting diodes (RCLEDs) emitting at 510 nm is optimised for maximum extraction efficiency into numerical apertures (NAs) of 1.0 and 0.5. The optimisation is performed as a function ... -
Modification of the FRET rate in quantum dot structures
(2011)Förster resonant energy transfer (FRET) can be applied to create energy flow on the nano-scale for light harvesting, colour conversion or sensing applications. The performance of such devices depends on the efficiency of ... -
Enhanced quantum efficiency in mixed donor-acceptor nanocrystal quantum dot monolayers
(2011)Colloidal nanocrystal quantum dots have attracted interest for use in light-harvesting and emitting devices. One of the key parameters for such applications is the quantum efficiency. Nanocrystal quantum dots exhibit reduced ... -
Hybrid metal nanostructure arrays for colour printing
(2016)Nanoscale metasurfaces have become an area of growing interest in recent years with the promise of new functionalities. One area that has received a lot of attention is sub-diffraction limit printing. We demonstrate the ... -
Nonradiative Energy Transfer and Photocurrent Enhancements in Hybrid Quantum Dot-MoS<inf>2</inf> Devices
(2018)The energy transfer mechanism leading to highly efficient nonradiative energy transfer (NRET) from quantum dots (QDs) to monolayer MoS 2 devices has been investigated via a spectral dependence study. The spectral dependence ... -
Tunable and efficient long range energy transfer via graphene plasmon modes
(2015)We present a theoretical investigation of the energy transfer efficiency between quantum systems placed in the vicinity of a doped graphene layer using a Green's tensor formalism. The direct interaction, Förster mechanism, ... -
Förster resonant energy transfer in quantum dot layers
(2010)Förster resonant energy transfer (FRET) in quantum dot (QD) layer structures has been analyzed. Small and large colloidal CdTe QDs were used as donors and acceptors, respectively. A FRET theory for random donor/acceptor ... -
Two-dimensional Förster resonant energy transfer in a mixed quantum dot monolayer: Experiment and theory
(2009)Energy transfer in monolayers of CdTe quantum dots (QDs), comprised of QDs of two different sizes, has been investigated. Förster resonant energy transfer (FRET) from QD donors to QD acceptors was observed and characterized ... -
Effect of metal nanoparticle concentration on localized surface plasmon mediated Förster resonant energy transfer
(2012)The influence of gold nanoparticle concentration on signatures of localized surface plasmon mediated Förster resonant energy transfer is investigated in a quantum dot–gold nanoparticle sandwich structure. At lower gold ... -
Enhancing the electrical properties of MoS2 through nonradiative energy transfer
(2017)In this study highly efficient nonradiative energy transfer from semiconductor quantum dots to monolayer MoS 2 with an efficiency of ~99% is demonstrated. Although the energy transfer efficiency is close to unity, there ... -
Characterization of a multi-electrode bulk-SOA for low NF in-line amplification in passive optical networks
(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 ... -
Novel design for noise controlled semiconductor optical amplifier
(2009)The use of semiconductor optical amplifiers (SOA) in optical communications networks has so far been limited due to their inherent large noise figure (NF) compared to Erbium Doped Fibre Amplifiers. Therefore improvement ... -
Surface Plasmon Enhanced Energy Transfer between Donor and Acceptor CdTe Nanocrystal Quantum Dot Monolayers
(2011)Surface plasmon enhanced Förster resonant energy transfer (FRET) between CdTe nanocrystal quantum dots (QDs) has been observed in a multilayer acceptor QD–gold nanoparticle–donor QD sandwich structure. Compared to a ...
