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Directional excitation of surface plasmons by dielectric resonators

机译:介电共振器对表面等离子体激元的定向激发

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摘要

An important aim of current research on plasmonics is to develop compact components to manipulate surface plasmon polaritons (SPPs) and specifically to develop efficient SPP couplers. The commonly used metallic resonators are inefficient to couple free-space waves to SPPs and metallic gratings require oblique incidence for achieving unidirectional propagation. In this article, we propose to use nanoscale nonuniform arrays of dielectric resonator antennas (DRAs) to realize unidirectional launching of SPPs. DRAs are made of low-loss high-permittivity nanostructures operating on a metal surface. The applications of metallodielectric nanostructures can produce resonances mainly in the low-loss dielectric parts and hence the power dissipated through oscillating current in metal can be reduced. Similar to metallic resonators, DRAs operating near resonance can provide phase control when coupling incident waves into SPPs, adding degrees of freedom in controlling propagation direction. The theoretical analysis in this article, with numerical validation, shows efficient SPPs launching by nonuniform array of cylindrical DRAs into a predesigned direction. Furthermore, with proper patterning, optimal launching can be achieved by avoiding power leakage via deflection into free space. The SPP launching condition and the influence of propagation loss are also mathematically analyzed from the viewpoint of antenna array theory. The SPPs launchers based on DRAs have a potential for applications in highly efficient integrated optics and optical waveguides.
机译:当前对等离激元学研究的一个重要目标是开发紧凑的组件来操纵表面等离激元极化子(SPP),特别是开发有效的SPP耦合器。常用的金属谐振器无法将自由空间波耦合到SPP,并且金属光栅需要倾斜入射才能实现单向传播。在本文中,我们建议使用介电共振器天线(DRA)的纳米级非均匀阵列来实现SPP的单向发射。 DRA由在金属表面上运行的低损耗高介电常数纳米结构制成。金属电介质纳米结构的应用可主要在低损耗电介质部分产生共振,因此可降低通过金属中的振荡电流而耗散的功率。与金属谐振器类似,在将入射波耦合到SPP中时,接近谐振的DRA可以提供相位控制,从而增加了控制传播方向的自由度。本文的理论分析通过数值验证表明,有效的SPP是由圆柱形DRA的非均匀阵列向预定方向发射的。此外,通过适当的构图,可以避免由于偏转到自由空间而导致的功率泄漏,从而实现最佳发射。从天线阵列理论的角度对SPP发射条件和传播损耗的影响进行了数学分析。基于DRA的SPP发射器具有在高效集成光学器件和光波导中应用的潜力。

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