We study numerically the dependence of dispersive and birefringence properties of silicon nanowires on waveguide dimensions and show that they have a strong geometrical dependence when nanowire dimensions become comparable to the wavelength of light inside the device. We develop a graphical method for engineering two or more dispersion parameters simultaneously and use it to demonstrate the pos...

We establish the framework for the comparison of πK scattering amplitudes from SU (3) chiral perturbation theory with suitable dispersive representations which result from the combination of certain fixed-t dispersion relations with dispersion relations on hyperbolic curves. This allows for predictions for some combinations of low energy constants appearing in higher order calculations of chira...

We investigate the characteristics of guided wave modes in planar coupled waveguides. In particular, we calculate the dispersion relations for TM modes in which one or both of the guiding layers consists of negative index media (NIM)-where the permittivity and permeability are both negative. We fi nd that the Poynting vector within the NIM waveguide axis can change sign and magnitude, a feature...

for an Invited Paper for the MAR08 Meeting of The American Physical Society Magnetotunneling spectroscopy: Imaging electron wavefunctions and measuring electron dispersion curves in GaMnAsand GaAsN-based heterostructures LAURENCE EAVES, School of Physics and Astronomy, University of Nottingham Magnetotunnelling spectroscopy is a powerful tool for imaging the wavefunctions of electrons in quantu...

We use Lattice Boltzmann models to simulate solute transport in porous media traversed by larger conduits and fit the resulting solute breakthrough curves with macroscopic Continuous Time Random Walk (CTRW) models. In this paper, the porous media are simulated using a real-numbered coefficient that partially damps the inertial components of the flow and, when the damping is large enough, leads ...