Chen Jianbing J, Grzegorczyk Tomasz M, Wu Bae-Ian, Kong Jin Au
Opt Express. 2005 Dec 26;13(26):10840-5. doi: 10.1364/opex.13.010840.
The ability of the Finite-Difference Time-Domain method to model a perfect lens made of a slab of homogeneous left-handed material (LHM) is investigated. It is shown that because of the frequency dispersive nature of the medium and the time discretization, an inherent mismatch in the constitutive parameters exists between the slab and its surrounding medium. This mismatch in the real part of the permittivity and permeability is found to have the same order of magnitude as the losses typically used in numerical simulations. Hence, when the LHM slab is lossless, this mismatch is shown to be the main factor contributing to the image resolution loss of the slab.
研究了时域有限差分法对由均匀左手材料（LHM）平板制成的理想透镜进行建模的能力。结果表明，由于介质的频率色散特性和时间离散化，平板与其周围介质之间在本构参数上存在固有失配。发现介电常数和磁导率实部的这种失配与数值模拟中通常使用的损耗具有相同的数量级。因此，当LHM平板无损耗时，这种失配被证明是导致平板图像分辨率损失的主要因素。
