非线性左手材料的时域研究
Time-domain analysis of nonlinear left-handed materials
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摘要: 分析了非线性左手材料模型，推导了非线性左手材料中的时域有限差分法及完美匹配层的计算式。数值模拟了具有Kerr非线性效应的左手材料平板中的电磁波。观察到该材料同样具有电磁聚焦特性。对比线性左手材料，其聚焦点的幅度和位置都会发生偏移。同时改变波源的强度及其到平板边界距离，讨论了不同距离情况下该非线性左手材料平板对电磁波分布的影响。当波源距离材料平板足够远，通过非线性左手材料聚焦的电场强度几乎集中在其外表面。Abstract: The nonlinear left-handed material(LHM) model was analyzed. The expressions of finite-difference time-domain(FDTD) method and perfectly-matched layer in such material were derived. Electromagnetic wave in Kerr nonlinear left-handed material model was simulated. Electromagnetic focus of Kerr nonlinear LHM was observed. Compared to linear LHM, it is observed that the location and the amplitude of the electromagnetic focus in such nonlinear LHM had changed. Various distances from source to LHM slab were concerned. Electric intensity was concentrated at LHM slab edge while the source was far enough.
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