Bezus Evgeni A, Doskolovich Leonid L
Opt Express. 2021 Feb 1;29(3):4022-4034. doi: 10.1364/OE.415259.
We propose and numerically investigate integrated high-contrast gratings (HCGs) for surface plasmon polaritons (SPPs) propagating along metal-dielectric interfaces, which consist of periodically arranged silicon pillars located on the gold surface. We demonstrate that such on-chip HCGs can be used as broadband plasmonic mirrors, which have subwavelength footprint in the SPP propagation direction and mean reflectance exceeding 85% in a 200-nm-wide spectral range for both the cases of normal and oblique SPP incidence. In order to increase the HCG efficiency and design practically feasible structures, we utilize a parasitic scattering suppression technique based on the use of two-layer grating pillars. The presented results may find application in two-dimensional optical circuits for steering the SPP propagation.
我们提出并通过数值方法研究了用于沿金属-电介质界面传播的表面等离激元极化激元（SPP）的集成高对比度光栅（HCG），该光栅由位于金表面的周期性排列的硅柱组成。我们证明，这种片上HCG可用作宽带等离子体镜，在SPP传播方向上具有亚波长尺寸，并且在垂直和倾斜SPP入射的情况下，在200纳米宽的光谱范围内平均反射率超过85%。为了提高HCG效率并设计切实可行的结构，我们采用了基于使用双层光栅柱的寄生散射抑制技术。所呈现的结果可能在用于控制SPP传播的二维光学电路中得到应用。
