ANALYSIS OF A PLASMONIC WAVEGUIDE USING THE FREQUENCY-DEPENDENT 3-D LOD-FDTD BASED ON A FUNDAMENTAL SCHEME

A fundamental scheme is utilized to efficiently implement the frequency-dependent three-dimensional locally one-dimensional finite-difference time-domain (3-D LOD-FDTD) method. The formulation is performed in matrix-operator-free forms in the right-hand sides of the resultant equations. A modified procedure, in which implicit and explicit equations are alternately calculated, needs to retain only 10 field arrays, while the traditional explicit FDTD requires 12. Analysis of a gap plasmonic waveguide validates the presented 3-D LOD-FDTD method