Single and multilayer metamaterials fabricated by nanoimprint lithography
Single and multilayer metamaterials fabricated by nanoimprint lithography
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DOI：
10.1088/0957-4484/22/32/325301
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发表时间：
2011-08-12
期刊：
影响因子：
3.5
通讯作者：
Schoeftner, R.
中科院分区：
文献类型：
--
作者：
Bergmair, I.;Dastmalchi, B.;Schoeftner, R.
我们第一次展示了一种快速简便的纳米压印光刻（NIL）的负折射率结构，如渔网和瑞士十字超材料的堆叠过程。该工艺只需几秒钟，价格便宜，并在大面积上生产三维（3D）负折射率材料（NIM），适合大规模生产。它可以在所有常见的基板上甚至在柔性塑料箔上进行。因此，这项工作是迈向NIM的新的和突破性的应用，如隐形设备，完美的镜头和使用NIM棱镜放大物体的重要一步。通过透射和反射光谱测量所制备的样品的光学性质。从测量的数据中，我们检索到的有效折射率被证明是负的波长约1.8 μ m的鱼网超材料，而瑞士交叉超材料样品在波长约1.4 μ m显示出明显的共振。
We demonstrate for the first time a fast and easy nanoimprint lithography (NIL) based stacking process of negative index structures like fishnet and Swiss-cross metamaterials. The process takes a few seconds, is cheap and produces three-dimensional (3D) negative index materials (NIMs) on a large area which is suitable for mass production. It can be performed on all common substrates even on flexible plastic foils. This work is therefore an important step toward novel and breakthrough applications of NIMs such as cloaking devices, perfect lenses and magnification of objects using NIM prisms. The optical properties of the fabricated samples were measured by means of transmission and reflection spectroscopy. From the measured data we retrieved the effective refractive index which is shown to be negative for a wavelength around 1.8 mu m for the fishnet metamaterial while the Swiss-cross metamaterial samples show a distinct resonance at wavelength around 1.4 mu m.