High-efficiency surface plasmonic polariton waveguides with enhanced low-frequency performance in microwave frequencies
High-efficiency surface plasmonic polariton waveguides with enhanced low-frequency performance in microwave frequencies
复制标题
高效表面等离子体极化波导，在微波频率下具有增强的低频性能
DOI：
10.1364/oe.25.002121
复制
发表时间：
2017-02-06
期刊：
影响因子：
3.8
通讯作者：
Sha, Xuejun
中科院分区：
文献类型：
--
作者：
Zhang, Dawei;Zhang, Kuang;Sha, Xuejun
本文首次提出了一种基于欺骗表面等离子激元（SSPP）的微波平面波导结构，该波导以波纹带两侧的金属为接地层。利用两侧接地的梯度波纹带实现了导波和SSPP之间简单有效的转换。与具有扩口接地的等离子体波导[Laser Photonics Rev. 8，146（2014）]相比，接地的添加有效地抑制了辐射损耗，并以更紧密的场约束改善了低频性能，这导致更宽的工作带宽。此外，随着SSPP的渐近频率的降低，SSPP的限制进一步增强的缺陷接地结构（DGS），这是通过周期性的凹槽对称的波纹带上实现的。因此，可以实现所提出的波导的小型化。测量结果验证了高效率的动量和阻抗匹配和增强的性能，在较低的频率区域的波矢量接近的自由空间。这些结果在微波频率等离子体功能器件和集成电路中具有重要的应用价值。(C)2017美国光学学会
In this paper, a planar waveguide based on spoof surface plasmon polaritons (SSPPs) with metals on both sides of the corrugated strip as grounds is firstly proposed in microwave region. Simple and efficient conversion between guided waves and SSPPs is realized by gradient corrugated strip with grounds on both sides. Compared with plasmonic waveguide with flaring ground [Laser Photonics Rev. 8, 146 (2014)], the addition of grounds suppresses the radiation loss effectively and improves the low-frequency performance with tighter field confinement, which leads to a wider operating bandwidth. Moreover, as the asymptotic frequency of SSPPs decreasing, the confinement of SSPPs is further enhanced by a defected ground structure (DGS), which is achieved by the periodic grooves symmetrical to those on the corrugated strip. Therefore, miniaturization of the proposed waveguide can be realized. Measured results validate both high efficiency of momentum and impedance matching and enhanced performance in the region of lower frequencies with the wave vectors close to those in free space. Such results have significant values in plasmonic functional devices and integrated circuits in microwave frequencies. (C) 2017 Optical Society of America