Imaging the near field
Imaging the near field
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DOI：
10.1080/09500340308235215
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发表时间：
2002-07
影响因子：
1.3
通讯作者：
S.Anantha Ramakrishna;J. Pendry;M. Wiltshire;W. Stewart
中科院分区：
文献类型：
--
作者：
S.Anantha Ramakrishna;J. Pendry;M. Wiltshire;W. Stewart
摘要 在之前的一篇论文中，我们介绍了完美透镜的概念，它可以同时聚焦近处和远处的电磁场，从而获得完美的分辨率。在这里，我们考虑对原始配方进行改进，以克服不完美材料的局限性。特别是，我们表明，正折射率介质和负折射率介质的多层堆叠对缺陷不太敏感。它具有像光纤束一样的新颖特性，但作用于近场，而不仅仅是辐射分量。通过使板更薄，延迟的影响被包含在内并最小化。吸收在近场中主导图像分辨率。对于较薄的层，金属吸收的有害影响会减少。
Abstract In an earlier paper we introduced the concept of the perfect lens which focuses both near and far electromagnetic fields, hence attaining perfect resolution. Here we consider refinements of the original prescription designed to overcome the limitations of imperfect materials. In particular we show that a multilayer stack of positive- and negative-refractive-index media is less sensitive to imperfections. It has the novel property of behaving like a fibre-optic bundle but one that acts on the near field, and not just the radiative component. The effects of retardation are included and minimized by making the slabs thinner. Absorption then dominates image resolution in the near field. The deleterious effects of absorption in the metal are reduced for thinner layers.