Negative-index metamaterials: looking into the unit cell.
Negative-index metamaterials: looking into the unit cell.
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DOI：
10.1021/nl100943e
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发表时间：
2010-06
期刊：
影响因子：
10.8
通讯作者：
M. Burresi;Daniela Diessel;D. van Oosten;S. Linden;M. Wegener;L. Kuipers
中科院分区：
文献类型：
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作者：
M. Burresi;Daniela Diessel;D. van Oosten;S. Linden;M. Wegener;L. Kuipers
超材料具有巨大的应用潜力，如超级透镜和隐身，是一类强大的纳米结构材料。所有这些应用都依赖于作为均匀材料的超材料。我们用相敏近场显微镜研究了一种负折射率超材料，并测量了其光学相位随距离的变化。靠近超材料，我们观察到非常大的空间相位变化在一个单一的单位细胞消失在200纳米的长度尺度从样品。最先进的超材料与均匀介质的这些偏差对于纳米级应用可能是重要的。
With their potential for spectacular applications, like superlensing and cloaking, metamaterials are a powerful class of nanostructured materials. All these applications rely on the metamaterials acting as a homogeneous material. We investigate a negative index metamaterial with a phase-sensitive near-field microscope and measure the optical phase as a function of distance. Close to the metamaterial we observe extremely large spatial phase variations within a single unit cell which vanish on a 200 nm length scale from the sample. These deviations of a state-of-the-art metamaterial from a homogeneous medium can be important for nanoscale applications.