2-D Unconditionally Stable CFS-PML Based on CNDG for Truncating Unmagnetized Plasma Media

An unconditionally stable implementation of the complex frequency-shifted perfectly matched layer based on Crank-Nicolson Douglas-Gunn (CNDG), combined the piecewise linear recursive convolution (PLRC) method is proposed to truncate the unmagnetized plasma in the finite-difference time-domain. The proposed algorithm makes full use of the unconditional stability of CNDG scheme and the high accuracy of the PLRC method. It not only saves much time and holds good absorbing performance, but is also easy to implement. A numerical example has been carried out to validate the algorithm.