Higher order implicit CNDG-PML algorithm for left-handed materials

By incorporating the higher order concept, piece-wise linear recursive convolution (PLRC) method and Crank-Nicolson Douglas-Gunn (CNDG) algorithm, unconditionally stable complex frequency shifted nearly perfectly matched layer (CFS-NPML) is proposed to terminate left-handed material (LHM) domain. The scheme takes advantages of CFS-NPML formulation, concept PLRC CNDG algorithm in terms absorbing performance, computational efficiency, calculation accuracy convenient implementation. A numerical example carried out demonstrate effectiveness efficiency scheme. results indicate that can not only have considerable performance but also maintain unconditional stability with enlargement time steps.