宽带全角度负折射各向异性纳米材料的超透镜成像理论
Superlens imaging theory for anisotropic nanostructured metamaterials with broadband all-angle negative refraction
摘要：
我们表明，由排列在介电基质中的金属纳米线组成的超材料具有强各向异性的光学特性。当填充比f<1/2时，复合介质表现出两种表面等离子体共振（SPR）：横向和纵向SPR，波长λ_t <lambda_l. For lambda>λ_l，纵向SPR，材料相对于纳米线轴表现出Re_t <0，Re_t>0，使得能够实现宽带全角度负折射和超透镜成像。建立了由这些介质构成的超透镜的成像理论。高性能的系统与金，银或铝纳米线在纳米多孔模板的设计和预测工作从红外到紫外频率。
英文摘要：
We show that a metamaterial consisting of aligned metallic nanowires in a dielectric matrix has strongly anisotropic optical properties. For filling ratio f<1/2, the composite medium shows two surface plasmon resonances (SPRs): the transverse and longitudinal SPR with wavelengths lambda_t<lambda_l. For lambda>lambda_l, the longitudinal SPR, the material exhibits Re epsilon_l<0, Re epsilon_t>0, relative to the nanowires axis, enabling the achievement of broadband all-angle negative refraction and superlens imaging. An imaging theory of superlens made of these media is established. High performance systems made with Au, Ag or Al nanowires in nanoporous templates are designed and predicted to work from the infrared up to ultraviolet frequencies.
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