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arXiv physics/0408117physics.opticsphysics.gen-ph
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利用电路等效性对双负超材料透镜“增长”倏逝场的物理研究

Physical Insight into the 'Growing' Evanescent Fields of Double-Negative Metamaterial Lenses Using their Circuit Equivalence

Andrea Alu, Nader Engheta

摘要:

Pendry在他的论文[Phys. Rev. Lett.,85,3966(2000)]提出了一种由n =-1的无损耗超材料板制成的透镜的想法,其可以提供具有超出常规极限的分辨率的聚焦。在他的分析中,这种无损双负(DNG)板内的倏逝波正在“增长”,因此它“补偿”了它外部的衰减指数,提供了该系统的亚波长透镜特性。在这里,我们研究这个有争议的问题“增长指数”从等效电路的角度来看,通过分析一组分布式电路元件,代表倏逝波与无损板的DNG介质的相互作用。我们的分析表明,在一定条件下,由于无损耗电路的适当谐振,串联元件中的电流和元件节点处的电压可以获得主导增长,为Pendry透镜和类似亚波长成像系统中的“指数增长”提供了另一种物理解释。

英文摘要:

Pendry in his paper [Phys. Rev. Lett., 85, 3966 (2000)] put forward an idea for a lens made of a lossless metamaterial slab with n = -1, that may provide focusing with resolution beyond the conventional limit. In his analysis, the evanescent wave inside such a lossless double-negative (DNG) slab is 'growing', and thus it 'compensates' the decaying exponential outside of it, providing the sub-wavelength lensing properties of this system. Here, we examine this debated issue of 'growing exponential' from an equivalent circuit viewpoint by analyzing a set of distributed-circuit elements representing evanescent wave interaction with a lossless slab of DNG medium. Our analysis shows that, under certain conditions, the current in series elements and the voltage at the element nodes may attain the dominant increasing due to the suitable resonance of the lossless circuit, providing an alternative physical explanation for 'growing exponential' in Pendry's lens and similar sub-wavelength imaging systems.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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