Rigorous formulation of oblique incidence scattering from dispersive media

Details Rigorous formulation of oblique incidence scattering from dispersive media Rigorous formulation of oblique incidence scattering from dispersive media

2010-03-07

arxiv.org/abs/1003.1530v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

35 pages, 8 figures, 4 tables

Scientific paper

We formulate a finite-difference time-domain (FDTD) approach to simulate electromagnetic wave scattering from scatterers embedded in layered dielectric or dispersive media. At the heart of our approach is a derivation of an equivalent one-dimensional wave propagation equation for dispersive media characterized by a linear sum of Debye-, Drude- and Lorentz-type poles. The derivation is followed by a detailed discussion of the simulation setup and numerical issues. The developed methodology is tested by comparison with analytical reflection and transmission coefficients for scattering from a slab, illustrating good convergence behavior. The case of scattering from a sub-wavelength slit in a dispersive thin film is explored to demonstrate the applicability of our formulation to time- and incident angle-dependent analysis of surface waves generated by an obliquely incident plane wave.

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