Rigorous formulation of oblique incidence scattering from dispersive media

Lingxiao Zhang, Tamar Seideman*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

We formulate a finite-difference time-domain 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 subwavelength 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.

Original languageEnglish (US)
Article number155117
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume82
Issue number15
DOIs
StatePublished - Oct 11 2010

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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