Deep-subwavelength light transmission in hybrid nanowire-loaded silicon nano-rib waveguides
Hybrid plasmonic waveguides leveraging the coupling between dielectric modes and plasmon polaritons have emerged as a major focus of research attention during the past decade. A feasible way for constructing practical hybrid plasmonic structures is to integrate metallic configurations with silicon-on-insulator waveguiding platforms. Here we report a transformative high-performance silicon-based hybrid plasmonic waveguide that consists of a silicon nano-rib loaded with a metallic nanowire. A deep-subwavelength mode area (λ2/4.5×105?λ2/7×103), in conjunction with a reasonable propagation distance (2.2–60.2 μm), is achievable at a telecommunication wavelength of 1.55 μm. Such a nano-rib-based waveguide outperforms its conventional hybrid and plasmonic waveguiding counterparts, demonstrating tighter optical confinement for similar propagation distances and a significantly enhanced figure of merit. The guiding properties of the fundamental mode are also quite robust against possible fabrication imperfections. Due to the strong confinement capability, our proposed hybrid configuration features ultralow waveguide cross talk and enables submicron bends with moderate attenuation as well. The outstanding optical performance renders such waveguides as promising building blocks for ultracompact passive and active silicon-based integrated photonic components.
基金项目：Penn State MRSEC, Center for Nanoscale Science (NSF DMR-1420620).
Qiang Ren：Department of Electrical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USASchool of Electronics and Information Engineering, Beihang University, Beijing 100191, China
Lei Kang：Department of Electrical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
Taiwei Yue：Department of Electrical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
Pingjuan L. Werner：Department of Electrical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
Douglas H. Werner：Department of Electrical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, USA
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Yusheng Bian, Qiang Ren, Lei Kang, Taiwei Yue, Pingjuan L. Werner, and Douglas H. Werner, "Deep-subwavelength light transmission in hybrid nanowire-loaded silicon nano-rib waveguides," Photonics Research 6(1), 37 (2018)