Gao Xi, Zhou Liang, Cui Tie Jun
1] School of Information and Communication, Guilin University of Electronic Technology, Guilin 541004, China [2] State Key Laboratory of Millimeter Waves, Department of Radio Engineering, Southeast University, Nanjing 210096, China.
School of Information and Communication, Guilin University of Electronic Technology, Guilin 541004, China.
Sci Rep. 2015 Mar 18;5:9250. doi: 10.1038/srep09250.
Surface plasmon polaritons (SPPs), either on metal-dielectric interfaces in optical frequencies or on structured metal surfaces in the lower frequencies, are dominantly even modes. Here we discover dominant odd-mode SPPs on a complementary plasmonic metamaterial, which is constructed by complementary symmetric grooves. We show that the fundamental SPP mode on such a plasmonic metamaterial is a tightly confined odd mode, whose dispersion curve can be tuned by the shape of groove. According to the electric field distributions of odd-mode SPPs, we propose a high-efficiency transducer using asymmetric coplanar waveguide and slot line to excite the odd-mode SPPs. Numerical simulations and experimental results validate the high-efficiency excitation and excellent propagation performance of odd-mode SPPs on the complementary plasmonic waveguides in the microwave frequencies.
表面等离激元极化激元（SPPs），无论是在光学频率下的金属 - 电介质界面上，还是在较低频率下的结构化金属表面上，主要都是偶模。在此，我们在一种互补等离子体超材料上发现了主导的奇模SPPs，这种超材料是由互补对称凹槽构成的。我们表明，在这种等离子体超材料上的基模SPP模式是一种紧密受限的奇模，其色散曲线可通过凹槽形状进行调谐。根据奇模SPPs的电场分布，我们提出了一种使用非对称共面波导和槽线来激发奇模SPPs的高效换能器。数值模拟和实验结果验证了在微波频率下互补等离子体波导上奇模SPPs的高效激发和优异传播性能。
