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Now showing items 141-150 of 2110
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 ...
Description of polarisation dependence of two-photon absorption in silicon avalanche photodiodes
(2010)
A simple formula is obtained that very accurately describes the level of two-photon absorption (TPA) generated by elliptically polarised light in silicon avalanche photodiodes (Si-APDs). The dichroism parameter necessary ...
Influence of graphene oxide/Ag nanoparticle composites on the fluorescence properties of organic dyes
(2017)
Graphene oxide/Ag nanoparticle (AgGO) composite materials have been proposed for surface enhanced Raman scattering (SERS) detection of fluorescent dye molecules. In this study we examine the role of the different components ...
Influence of an Au capping layer on the magnetic properties of CoPt nanowires
(2011)
Equiatomic CoPt nanowires with a gold cap layer have been fabricated by electrochemical template synthesis. Au improves the structural and magnetic properties of the L10 ordered CoPt, leading to coercivities of up to 1.43 ...
Investigation of different synthetic routes to and structure-property relationships of poly(m-phenylenevinylene-co-2,5-dioctyloxy-p-phenylenevinylene)
(2003)
The synthesis of poly(m-phenylenevinylene-co-2,5-dioctyloxy-p-phenylenevinylene) by Horner?Emmons and Wittig condensation polymerisation in three different solvents is described. The chemical and optical properties of the ...
Polarization dependent intra-band dynamics in semiconductor optical amplifiers
(2007)
The polarization dependence of gain dynamics in a bulk semiconductor optical amplifier has been investigated using a 2.5 ps pump-probe set-up in a counter-propagation configuration. A theoretical model based on the carrier ...
Charge transport effects in field emission from carbon nanotube-polymer composites
(Elsevier, 2005)
Electron field emission measurements have been made on multiwall arc discharge carbon nanotubes embedded in a conjugated polymer host. Electron emission at low nanotube content is observed and attributed to an enhancement ...
Numerical investigations of magnetic field effects on electrodeposition
(Trinity College (Dublin, Ireland). School of Physics, 2002)
Electrodeposits are fractal in nature when grown in a flat electrochemical cell, in which an aqueous solution of salt of a metal such as Cu, Zn or Ag is held between an anode and cathode by two flat sheets of perspex. These ...
Magnetoelectric properties of BixCo2-xMnO4 (0<= x <=0.3)
(2008)
We present the structural, dielectric and magnetization study of single phase polycrystalline BixCo2?xMnO4 (0 ? x ? 0.3), synthesized by a conventional solid state route. All the samples have the cubic spinel structure ...