Designing efficient and compact couplers is crucial in hybrid integration of plasmonic components with conventional silicon-on-insulator components. Taper-funnel structures are conventionally used to couple light from a silicon strip waveguide to a metal–dielectric–metal plasmonic waveguide. In this paper, we investigate the effect of different parameters of the metallic funnel and the vertically and laterally tapered silicon waveguide on the performance of the designed coupler. Numerical simulations indicate that the tuned coupler has an average coupling efficiency of 87% in the C-band. The designed 1.18-µm-long coupler has a shorter length compared to the previous designs, while its theoretical coupling efficiency is higher than 85% in the entire O, E, S, C, L, and U bands of optical communication.

中文翻译：

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通过垂直和横向锥形漏斗结构将绝缘体上硅波导耦合到金属-电介质-金属等离子体波导

设计高效且紧凑的耦合器对于等离子体组件与传统绝缘体上硅组件的混合集成至关重要。锥形漏斗结构通常用于将光从硅带波导耦合到金属-电介质-金属等离子体波导。在本文中，我们研究了金属漏斗和垂直和横向锥形硅波导的不同参数对设计的耦合器性能的影响。数值模拟表明调谐耦合器在 C 波段的平均耦合效率为 87%。与之前的设计相比，设计的 1.18 µm 长耦合器的长度更短，而其理论耦合效率在整个 O、E、S、C、L 和 U 波段的光通信中均高于 85%。