MAGNETISM AND EFFECTIVE ELECTROMAGNETIC PARAMETERS FROM DIELECTRIC SPHERES

摘要

The effective electric and magnetic properties are found for a material composed of non-magnetic spheres. These parameters are found in the long-wavelength limit as a function of the frequency, composition, size, and volume density of the spheres. A fundamental resonant magnetic response is found when polaritonic materials are used. The effective media parameters are verified by band structure calculations. Frequency ranges with negative permeability and negative group velocities are found. This simple composite extends magnetic materials into the infrared regime.