Abstract
This letter presents a new unconditionally stable scattered field (SF) finite-difference time-domain (FDTD) scheme for Drude dispersive medium based on leapfrog alternating direction implicit (ADI) technique. The proposed scheme introduces polarization current density and analytical incident field terms in the leapfrog scheme without adding extra computational complexities except causing minor changes in the coefficients for the central spatial locations. Unconditional stability and accuracy of the scheme are validated by numerical tests. When the Courant number is set to three or a higher value, the scheme can perform faster than the explicit FDTD scheme.
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