A new two-dimensional plasmonic directional coupler is proposed based on the hybrid metal-insulator slab waveguide (HMISW). It is analyzed using the super mode theory (SMT) based on solving the symmetrical and antisymmetrical modes with the aim of transfer matrix method (TMM). The hybrid slab waveguide is composed of a metallic layer of silver and two dielectric layers of silica (SiO2) and silicon (Si). Analysis is performed at the telecommunication wavelength of 1550 nm. Optimization of the coupling length according to layer thicknesses is mainly considered. Maximum transferred power (Pmax) and the spatial extent of the coupler (Ls) are calculated as two additional performance criteria. It is shown that coupling lengths as low as 0.5 μm could be achieved resulting in a coupler much smaller than conventional directional couplers. In this case, percentage of transferred power is 90, coupler thickness is about 200 nm and the spatial length is 700 nm.
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机译：提出了一种基于混合金属-绝缘体平板波导（HMISW）的二维等离子定向耦合器。基于超对称理论（SMT），以传递矩阵法（TMM）为目标，对对称和非对称模式进行了分析。混合平板波导由银的金属层和二氧化硅（SiO 2 ）和硅（Si）的两个介电层组成。分析是在1550 nm的电信波长下进行的。主要考虑根据层厚度优化耦合长度。计算最大传输功率（P max ）和耦合器的空间范围（L s ）作为另外两个性能标准。结果表明，可以实现低至0.5μm的耦合长度，从而使耦合器比传统的定向耦合器小得多。在这种情况下，传输功率的百分比为90，耦合器厚度约为200 nm，空间长度为700 nm。
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