A.D. Boardman

Effect of a magnetic field on interband electron transfer in gallium arsenide

Abstract We present some numerical results of a Monte Carlo calculation of the effect of a transverse magnetic field on the velocity-electric field relationship for gallium arsenide.

The surface plasmon modes of spherical voids in irradiated metals

Abstract The surface plasmon modes of spherical voids in metals modeled by a free-electron gas are calculated within a hydrodynamic formulation. Spatial dispersion, retardation, and surface electron density variation are included. A sharp-surface model is considered first and it is shown that the modes are non-radiative. A novel matrix method is used to discuss the sensitivity of the results to the use of different surface density profiles. It is shown that the interplay between surface inhomogeneity and spatial dispersion always results in a mode in the near neighbourhood of the sharp-surface mode. There are, however, other structure-induced modes which are well-separated from the sharp-surface results. The l = 0 breathing mode is affected by retardation and surface structure but is unaffected by spatial dispersion.

Transverse electric polarized nonlinear guided waves in multilayer structures

Abstract We investigate the properties of TE-polarized nonlinear surface-guided waves propagating in both finite and semi-infinite periodic stratified structures in contact with semi-infinite self-focusing Kerr-like media using the transfer matrix method the stationary field distributions and the dependence of the propagation wave-vector on the power flow are obtained exactly.

A Monte Carlo calculation of the velocity-field characteristic for ferromagnetic Cd Cr2 Se4

Abstract A Monte Carlo calculation is presented of the velocity-field characteristic for the ferromagnetic semiconducting spinel Cd Cr 2 Se 4 . The results are compared with existing results, based upon the assumption of a displaced Maxwellian distribution function, which are shown to differ quite considerably.

ATR magneto-optics

The reflectance and magneto-optical effects of thin films of CrTe are evaluated theoretically for configurations of attenuated total reflection (ATR). The maximum value of the Kerr rotation, (φK)max for GMA (glass-material-air) and GAM (glass-air-material) configurations is found to be in excess of that of the single glass-material interface by factors of ≈ 100 and ≈ 10, respectively. The corresponding maximum signal-to-noise ratios (S/N)max are modified by factors of 2 and 12, respectively. An interpretation of the results in terms of surface modes is given and it is shown that the GAM case can be interpreted in terms of the conventional free surface mode whereas the GMA case cannot. The latter case is an enhanced pseudo-Brewster effect of the type which occurs for all conduction systems regardless of whether they possess dielectric functions with negative or positive real parts.

The critical effect of the surface density gradient on surface plasmon dispersion

Abstract An analytical expression is given for the linear dispersion coefficient of surface plasmons on metals and semiconductors. The influence of the surface density profile in the selvage region is included by a model which yields a critical width.

Theory of optical generation of longitudinal phonon modes in ionic crystals

The optical generation of bulk phonon polaritons in ionic crystals is treated by the inclusion of the effects of spatial dispersion in classical dispersion theory. The theory is used to explain structural features of the resonance infra-red reflection spectrum of Cr2O3.

Surface plasma modes using a non-local retardation model of a metal

Abstract The plasmon-polariton modes of a spatially dispersive metal with a model double step-function surface electron density profile are given. The fluctuation density profiles, associated with each normal mode, are calculated and it is concluded that although the distributions are often polar in nature they are not such as to yield an elementary classification of them in terms of multipoles.

SCATTERING MATRIX ANALYSIS OF ANISOTROPIC ELECTRON SCATTERING.

Abstract We present formulae for the momentum transfer cross section of an elastic particle incident perpendicular and parallel respectively to the axis of symmetry of a point dipole potential.