Sun Bo, Yu Ying-Ying, Zhang Shun, Yang Wen-Xing
Opt Lett. 2019 Aug 1;44(15):3861-3864. doi: 10.1364/OL.44.003861.
Here, on a platform of two split-ring resonator (SRR) disks in the microwave regime, we have numerically and experimentally investigated the coupling of toroidal localized spoof surface plasmons (LSSPs). The coupling effect is investigated both theoretically and experimentally. We observe that magnetic dipole coupling exists in the toroidal LSSPs coupling and causes a rearrangement of the toroidal LSSPs, which suppresses the propagation of toroidal LSSPs. To realize the propagation of toroidal LSSPs, we introduce conductive coupling into the SRR disks. The conductive coupling can correct magnetic dipole coupling and enhance toroidal LSSPs coupling. Both numerical simulations and experiments are in good agreement. The toroidal LSSPs can be effectively propagated, even in the three right-angle-bent SRR disks. This study paves the way toward a better understanding of toroidal LSSPs coupling and finds many applications in the transfer of electromagnetic energy using toroidal moments.
在此，在微波波段由两个分裂环谐振器（SRR）盘构成的平台上，我们对环形局域类表面等离子体激元（LSSP）的耦合进行了数值和实验研究。从理论和实验两方面对耦合效应进行了研究。我们观察到在环形LSSP耦合中存在磁偶极耦合，这会导致环形LSSP的重新排列，从而抑制环形LSSP的传播。为了实现环形LSSP的传播，我们在SRR盘中引入了传导耦合。传导耦合可以校正磁偶极耦合并增强环形LSSP耦合。数值模拟和实验结果吻合良好。即使在三个直角弯曲的SRR盘中，环形LSSP也能有效传播。这项研究为更好地理解环形LSSP耦合铺平了道路，并在利用环形矩进行电磁能量传输方面发现了许多应用。
