Effective Surface Plasmon Polaritons Induced by Modal Dispersion in a Waveguide
Effective Surface Plasmon Polaritons Induced by Modal Dispersion in a Waveguide
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DOI：
10.1103/physrevapplied.7.044028
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发表时间：
2017-04-27
影响因子：
4.6
通讯作者：
Luo, Yu
中科院分区：
文献类型：
--
作者：
Li, Zhuo;Liu, Liangliang;Luo, Yu
我们提供了进一步的理论见解和实验验证的模式色散诱导的有效表面等离子体激元（ESPPs）的工程横向电（TE）模式在传统的矩形波导。完整的场分布，色散关系，和渐近频率的ESPPs解析推导。设计了波口激励和光滑桥，实现了矩形波导中的传播模式与静电等离子体探测器中的模式转换。对TE10和TE20模诱导的ESPPs进行了解析计算和数值模拟，结果显示出很好的一致性。此外，我们设计了一个双层衬底集成波导显示ESPPs支持在两个层之间的界面具有不同的介电常数。这项工作开辟了一条途径，低频设计表面等离子体，并可能会发现在微波和太赫兹频率的紧凑型滤波器，谐振器和传感器的ESPPs的设计中的潜在应用。
We provide further theoretical insights and experimental verification of the modal-dispersion-induced effective surface-plasmon polaritons (ESPPs) by engineering the transverse-electric (TE)modes in conventional rectangular waveguides. The complete field distributions, dispersion relations, and asymptotic frequency of the ESPPs are derived analytically. Wave-port excitations and smooth bridges are designed for the mode conversion between propagating modes in rectangular waveguides and the ESPPs. Analytical calculations and numerical simulations are performed for TE10 -and TE20 -mode-induced ESPPs, showing excellent agreement. Moreover, we design a double-layered substrate-integrated waveguide showing that ESPPs are supported at the interface between the two layers with different dielectric constants. This work opens up an avenue for low-frequency designer surface plasmons and may find potential applications in the design of compact filters, resonators, and sensors of ESPPs in the microwave and terahertz frequencies.