PML Implementation for Efficient 3-D Laguerre-Based FDTD Method Using a New Perturbation Term

In this letter, the three-dimentional Berenger's perfectly matched layer (PML) implementation is proposed for the efficient Laguerre-based finite-difference time-domain method using a new perturbation term. By using this new term and the factorization-splitting scheme, the huge matrix equation of Berenger's PML implementation is split into six tridiagonal matrices and solved efficiently. In the numerical validation, the absorbing performance of the proposed PML implementation is studied as a function of the constitutive parameters and is compared to the existing absorbing boundary conditions (ABCs). Numerical results show that the proposed PML implementation has a better absorbing performance.