Abstract-A three-dimensional (3-D) finite-difference timedomain (FDTD) algorithm is developed to study the transformation of an electromagnetic wave by a dynamic (time-varying) inhomogeneous magnetized plasma medium. The current density vector is positioned at the center of the Yee cube to accommodate the anisotropy of the plasma medium due to the presence of a static magnetic field. An appropriate time-stepping algorithm is used to obtain accurate solutions for arbitrary values of the collision frequency and the electron cyclotron frequency. The technique is illustrated by calculating the frequency shifts in a cavity due to a switched magnetoplasma medium with a timevarying and space-varying electron density profile.

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In an article of numerical modeling and simulation of organic light emitting diodes [J. Appl Phys. 86, 3895 (1999)], Staudigel et al. solved a one-dimensional Poisson equation to get an electric field at each monolayer, which is incorrect. The corrected solution of the Poisson equation can give a quantitatively different numerical result if the differences of dielectric constants among the layers are not negligible.