Capacitive-coupled Series Spoof Surface Plasmon Polaritons.
Capacitive-coupled Series Spoof Surface Plasmon Polaritons.
复制标题
电容耦合串联欺骗表面等离子体激元
DOI：
10.1038/srep24605
复制
发表时间：
2016-04-19
影响因子：
4.6
通讯作者：
Cui TJ
中科院分区：
文献类型：
--
作者：
Yin JY;Ren J;Zhang HC;Zhang Q;Cui TJ
提出了一种在表面等离子体激元（SPPs）的工作频率范围内实现阻带的新方法。阻带是由一种新型的电容耦合的串联欺骗SPP引入的。提出了两个传统的H形单胞来构造一个新的单胞，每两个新的单胞之间间隔一定距离的间隙，该间隙用于实现电容耦合。在传输过程中，由于表面阻抗的电容耦合，使得原有的表面阻抗匹配受到干扰，从而导致阻带现象。通过数值模拟和实验验证了该方法的有效性，模拟结果与实验结果吻合较好。结果表明，该结构的阻带在9 ~ 9.5 GHz，而带通特性在5-9 GHz和9.5 ~ 11 GHz保持不变。在通带内，反射系数小于−10 dB，传输损耗约为3 dB;在阻带内，反射系数为−2 dB，传输系数小于−30 dB。该结构具有体积小、易于制作、带通和带阻特性等优点，是SPP通信系统中一种很有前途的等离子体器件。
A novel method to realize stopband within the operating frequency of spoof surface plasmon polaritons (SPPs) is presented. The stopband is introduced by a new kind of capacitive-coupled series spoof SPPs. Two conventional H-shaped unit cells are proposed to construct a new unit cell, and every two new unit cells are separated by a gap with certain distance, which is designed to implement capacitive coupling. The original surface impedance matching is disturbed by the capacitive coupling, leading to the stopband during the transmission of SPPs. The proposed method is verified by both numerical simulations and experiments, and the simulated and measured results have good agreements. It is shown that the proposed structure exhibits a stopband in 9–9.5 GHz while the band-pass feature maintains in 5–9 GHz and 9.5–11 GHz. In the passband, the reflection coefficient is less than −10 dB, and the transmission loss is around 3 dB; in the stopband, the reflection coefficient is −2 dB, and the transmission coefficient is less than −30 dB. The compact size, easy fabrication and good band-pass and band-stop features make the proposed structure a promising plasmonic device in SPP communication systems.