Multifocal flat lens with left-handed metamaterial
Multifocal flat lens with left-handed metamaterial
复制标题
左手超材料多焦点平面透镜
DOI：
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发表时间：
2005
期刊：
影响因子：
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通讯作者：
Z. D. Schwartz
中科院分区：
文献类型：
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作者：
Jeffrey D. Wilson;Z. D. Schwartz
我们展示了实验结果，证明由左手超材料（LHM）构成的平面透镜在微波频率下具有多个焦距。传统镜片由正折射率材料制成，需要曲面或不均匀结构来聚焦光或其他电磁辐射，而传统镜片则相反，由于有效折射率为负，因此 LHM 不需要曲率。这种平面透镜的优点是能够通过简单地改变电磁源和透镜之间的距离来改变焦距。
We show experimental results demonstrating multiple focal lengths at microwave frequencies in a flat lens constructed of left-handed metamaterial (LHM). In contrast to conventional lenses, which are constructed of materials with positive index and require a curved surface or inhomogeneous structures to focus light or other electromagnetic radiation, no curvature is needed with a LHM because of a negative effective index of refraction. Such a flat lens has the advantage of being capable of changing the focal length by simply changing the distance between the electromagnetic source and the lens.