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

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