Alù Andrea, Silveirinha Mário G, Engheta Nader
Department of Electrical and Systems Engineering, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA.
Phys Rev E Stat Nonlin Soft Matter Phys. 2008 Jul;78(1 Pt 2):016604. doi: 10.1103/PhysRevE.78.016604. Epub 2008 Jul 23.
Following our recent interest in metamaterial-based devices supporting resonant tunneling, energy squeezing, and supercoupling through narrow waveguide channels and bends, here we analyze the fundamental physical mechanisms behind this phenomenon using a transmission-line model. These theoretical findings extend our theory, allowing us to take fully into account frequency dispersion and losses and revealing the substantial differences between this unique tunneling phenomenon and higher-frequency Fabry-Perot resonances. Moreover, they represent the foundations for other possibilities to realize tunneling through arbitrary waveguide bends, both in E and H planes of polarization, waveguide connections, and sharp abruptions and to obtain analogous effects with geometries arguably simpler to realize.
鉴于我们最近对基于超材料的器件感兴趣，这些器件通过狭窄的波导通道和弯曲来支持共振隧穿、能量压缩和超耦合，在此我们使用传输线模型分析这一现象背后的基本物理机制。这些理论发现扩展了我们的理论，使我们能够充分考虑频率色散和损耗，并揭示这种独特的隧穿现象与高频法布里 - 珀罗共振之间的显著差异。此外，它们为实现通过任意波导弯曲（在电场和磁场极化平面中）、波导连接以及急剧突变进行隧穿的其他可能性奠定了基础，并通过可论证地更易于实现的几何结构获得类似的效果。
