Rigorous formulation of oblique incidence scattering from dispersive media

Article

关键词: DIFFERENCE TIME-DOMAIN;    FINITE-DIFFERENCE;    SURFACE-PLASMONS;    LAYERED MEDIA;    FDTD;    WAVES;    SIMULATION;    MICROSCOPY;    INTERFACES;    ALGORITHM;   

DOI  :  10.1103/PhysRevB.82.155117

来源: SCIE

【 摘 要 】

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.

【 授权许可】

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