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Title: Uniaxial PML absorbing boundary condition for truncating the boundary of DNG metamaterials
Authors: Zheng, KS
Tam, WY 
Ge, DB
Xu, JD
Issue Date: 2009
Source: Progress in electromagnetics research letters, 2009, v. 8, p. 125-134 How to cite?
Journal: Progress In Electromagnetics Research Letters 
Abstract: The conventional perfectly matched layer (PML) absorbing boundary condition is shown to be unstable when it is extended to truncate the boundary of the double negative (DNG) medium. It is a consequence of the reverse directions of the Poynting and phasevelocity vectors of plane waves propagating in such material. In this paper, a modified uniaxial PML (UPML), which is stable for the DNG medium, is derived. The auxiliary differential equation technique is introduced to derive the discrete field-update equations of DNG-UPML. Numerical results demonstrate the effectiveness and stability of the new UPML for the DNG medium.
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