Multimode interference effect in plasmonic subwavelength waveguides and an ultra-compact power splitter |
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| Authors: | Zhanghua Han Sailing He |
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| Affiliation: | a Center for Optical and Electromagnetic Research, and JORCEP [Joint Research center of Photonics of the Royal Institute of Technology (Sweden) and Zhejiang University], Zijingang Campus, Zhejiang University, Hangzhou, China
b Division of Electromagnetic Theory, School of Electrical Engineering, Royal Institute of Technology, S-100 44 Stockholm, Sweden |
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| Abstract: | The real part of the effective index is enhanced in a metal-insulator-metal (MIM) surface plasmon waveguide when the thickness of the insulator is quite small and this mechanism can be utilized to achieve some ultra-compact photonic devices. The mode properties of an index-guided multimode plasmonic waveguide of subwavelength size are analyzed and the multimode interference (MMI) effect is investigated. A novel ultra-compact MMI power splitter, with the transverse size less than 1/3 of the free space wavelength, is proposed. |
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| Keywords: | Surface plasmon Multimode interference Power splitter |
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