Canice O'Brien

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Multifunctional nature of the Fe-Ti-oxides makes them attractive candidates for novel applications in which their coupled semiconductor, magnetic, dielectric and optical properties can be exploited. In particular, they appear to be good candidates for the emerging technologies such as spintronics, magneto-electronics, and radhard electronics. In this paper(More)
The objective of this work was to investigate and evaluate the effect of the cooling environment on the microstructure, secondary phase precipitates and mechanical properties of an as-cast cobalt alloy. The microstructure of castings has a large bearing on the mechanical properties, grain size, porosity and the morphology of carbide precipitates are thought(More)
We report low loss silicon-on-sapphire nanowires for applications to mid infrared optics. We achieve propagation losses of < 1dB/cm at λ=1550nm and < 2dB/cm at λ = 2.08 μm and λ = 5.18 μm, the latter representing a factor of 2 reduction in loss over the best previous results.
The linewidth enhancement factors of lattice-matched 1.5 μm wavelength InGaNAs/GaAs and InGaAs/InP singlequantum-well structures have been calculated using microscopic theory including many-body effects and a 10x10 effective-mass Hamiltonian. For applications which require high gain and carrier densities, InGaNAs/GaAs quantum wells have a much lower(More)
The use of a fully two-dimensional waveguide analysis of the optical modes in a self-pulsating laser is described. We show that there is a need for such an analysis as the effective index model often used for modeling semiconductor lasers is shown not to provide a correct optical mode when the lateral waveguide is only weakly guiding. An efficient technique(More)
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