非线性超材料对电磁场的参数屏蔽
Parametrically Shielding Electromagnetic Fields by Nonlinear Metamaterials
摘要：
建立了折射率接近于零的超材料多层结构中同时具有非线性电磁响应的参量相互作用的解析理论。从理论上证明了介电常数和磁导率均为负的非线性左手材料平板可以参数化屏蔽一定频率的电磁场。趋肤深度是可调的，并且即使在没有材料吸收的情况下，也可以远小于被屏蔽的电磁场的波长。这种奇特的行为是左手材料中复杂的非线性响应和在泵浦频率处光学折射率消失的结果。
英文摘要：
An analytical theory is developed for parametric interactions in metamaterial multilayer structures with simultaneous nonlinear electronic and magnetic responses and with near-zero refractive-index. We demonstrate theoretically that electromagnetic fields of certain frequencies can be parametrically shielded by a nonlinear left-handed material slab, where the permittivity and permeability are both negative. The skin depth is tunable, and even in the absence of material absorption, can be much less than the wavelength of the electromagnetic field being shielded. This exotic behavior is a consequence of the intricate nonlinear response in the left-handed materials and vanishing optical refractive-index at the pump frequency.
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