  A novel explicit method to model Lorentz linear dispersive media with finite
difference method are presented. The method shows an explicit method without
any modification to the Leap-Frogging scheme. The polarizations of the Lorentz
media are convoluted simply in the current density. The numerical results are
shown to be competitive accuracy with a conventional method. The codes used in
the numerical investigation are available on the GitHub
(https://github.com/habe36/Dispersive FDTD).
