Frequency‐dependent finite‐difference time‐domain method based on iterated Crank–Nicolson scheme

Abstract

Abstract The finite‐difference time‐domain (FDTD) method based on the iterated Crank–Nicolson (ICN) scheme is extended to a frequency‐dependent version. The Drude model is used to express a metal dispersion, which is incorporated into the iterated Crank–Nicolson formulation with the trapezoidal recursive convolution technique. The validity of the present finite‐difference time‐domain method with convolutional perfectly matched layers is discussed through the analysis of a metal‐insulator‐metal plasmonic waveguide. Numerical results obtained from a two‐iteration technique are found to agree well with those from the traditional explicit finite‐difference time‐domain method.

Keywords

• finite difference methods
• plasmonics
• time‐domain analysis