Babicheva Viktoriia E, Shalaginov Mikhail Y, Ishii Satoshi, Boltasseva Alexandra, Kildishev Alexander V
Opt Express. 2015 Apr 20;23(8):9681-9. doi: 10.1364/OE.23.009681.
Engineering plasmonic metamaterials with anisotropic optical dispersion enables us to tailor the properties of metamaterial-based waveguides. We investigate plasmonic waveguides with dielectric cores and multilayer metal-dielectric claddings with hyperbolic dispersion. Without using any homogenization, we calculate the resonant eigenmodes of the finite-width cladding layers, and find agreement with the resonant features in the dispersion of the cladded waveguides. We show that at the resonant widths, the propagating modes of the waveguides are coupled to the cladding eigenmodes and hence, are strongly absorbed. By avoiding the resonant widths in the design of the actual waveguides, the strong absorption can be eliminated.
设计具有各向异性光学色散的等离激元超材料，使我们能够定制基于超材料的波导的特性。我们研究了具有介电芯和具有双曲线色散的多层金属 - 介质包层的等离激元波导。在不使用任何均匀化方法的情况下，我们计算了有限宽度包层的共振本征模，并发现与包层波导色散中的共振特征相符。我们表明，在共振宽度处，波导的传播模式与包层本征模耦合，因此被强烈吸收。通过在实际波导设计中避免共振宽度，可以消除强吸收。
