Near-perfect tunneling and amplification of evanescent electromagnetic waves in a waveguide filled by a metamaterial: Theory and experiments
Near-perfect tunneling and amplification of evanescent electromagnetic waves in a waveguide filled by a metamaterial: Theory and experiments
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DOI：
10.1103/physrevb.72.075116
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发表时间：
2005-08
影响因子：
3.7
通讯作者：
J. Baena;L. Jelínek;R. Marqués;F. Medina
中科院分区：
文献类型：
--
作者：
J. Baena;L. Jelínek;R. Marqués;F. Medina
超材料平板对倏逝电磁波的放大一直是一个有争议的问题。截止工作的金属波导为产生和研究这些波提供了一个独特的物理环境，因为在这种环境中可以激发孤立的倏逝模。本文分析了电磁波在部分填充超材料的矩形波导中的隧穿问题。增强隧穿由于放大的倏逝波的超材料填充波导部分被证明。由于矩形波导中的倏逝模是两个平面波的叠加，因此上述结果还显示了自由空间中的超材料板对倏逝平面波的放大和隧穿。
Amplification of evanescent electromagnetic waves by a metamaterial slab is still a controversial issue. Metallic waveguides operating in cutoff provide a unique physical environment to produce and study these waves because isolated evanescent modes can be excited in such environment. In this paper, the tunneling of electromagnetic waves through a rectangular waveguide partially filled by a metamaterial is analyzed. Enhanced tunneling due to the amplification of evanescent waves in the metamaterial filled waveguide section is demonstrated. Since evanescent modes in rectangular waveguides are the superposition of two plane waves, the aforementioned results also show the amplification and tunneling of evanescent plane waves by a metamaterial slab in free space.