Simple implementation of effective permittivity at dispersive metal-dielectric tilt interfaces for open-source FDTD package

摘要

In recent years, metamaterial has gained tremendous attention for its extraordinary properties and applications in both microwave and optical regime. It is categorized as a material with negative permittivity or permeability. At high THz frequency (such as optical communication band), metals possess negative epsilon as metamaterials. Due to the rapid growth of nanotechnology, sub-micron metal waveguides can confine optical fields at nano-scale (much smaller than signal wavelength) that cannot be achieved by pure dielectric. This kind of waveguide is also called plasmonic waveguide that guides wave in the form of surface plasmons, which is known as electron oscillation on metal surfaces.