Institutional research of nanoelectromagnetics


University of Wisconsin-Milwaukee, USA

Natural materials (plasma and semiconductors) and artificial wire materials exhibiting spatial dispersion are considered using a transport model. The connection between drift-diffusion and electron transport in natural materials is highlighted, and then applied to various forms of wire media, such as a carbon nanotube effective medium, leading to the definition of effective conductivity and diffusion parameters that characterize the material. It is shown that the effective material parameters lead to a Debye length that provides a quantitative measure of the strength of spatial dispersion for wire media. Further, it is shown that Pekar's additional boundary condition applies in many instances to natural materials as well as artificial wire media, and can be derived from elementary electromagnetics. Examples for simple structures will be presented illustrating the presented theory. Time permitting, the analysis of the nonlinear and spatially-dispersive response of a semiconductor or plasma to large-amplitude time-harmonic electromagnetic fields will be discussed.