Waves in Random and Complex Media ( IF 4.051 ) Pub Date : 2020-06-03 Thanos Ioannidis, Tatjana Gric, Edik Rafailov
The tunable spiral nanowire metamaterial design at optical frequency is presented, and the surface polaritons are theoretically studied. It was found that the dispersions of the polaritons could be tuned by varying physical dimensions of the spiral nanowire metamaterial. This geometry is unique. Doing so, one may dynamically control the properties of surface polaritons. In addition, the Ferrell–Berreman modes can be excited that is impossible with the regular nanowire metamaterials having the circular cross-section of the nanowires. Herein, the presence of Ferrell–Berreman branches is confirmed by the performed analysis of the metamaterial band structure. It is worthwhile noting, that existence of Ferrell–Berreman modes is possible without epsilon-near-zero (ENZ) regime. The design of devices where Ferrell–Berreman modes can be exploited for practical applications ranging from plasmonic sensing to imaging and absorption enhancement is possible because of the propagation constant revealing subtle microscopic resonances.
中文翻译:
螺旋纳米线超材料的可调谐极化子
提出了可调谐螺旋纳米线超材料在光频率下的设计,并对表面极化子进行了理论研究。发现可以通过改变螺旋纳米线超材料的物理尺寸来调整极化子的色散。这种几何形状是唯一的。这样做,可以动态地控制表面极化子的性质。另外,费雷尔-伯雷曼模式可以被激发,这对于具有纳米线圆形横截面的常规纳米线超材料是不可能的。在这里,通过对超材料能带结构的分析证实了Ferrell-Berreman分支的存在。值得注意的是,如果没有epsilon-near-zero(ENZ)体制,Ferrell-Berreman模式的存在是可能的。