15 March 2016 A new design for coupling light between silicon strip waveguide and plasmonic slot waveguide
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Proceedings Volume 9753, Optical Interconnects XVI; 97531A (2016) https://doi.org/10.1117/12.2211575
Event: SPIE OPTO, 2016, San Francisco, California, United States
Abstract
We simulate and test a new structure for light coupling from silicon strip waveguide to plasmonic slot waveguide. The conventional approach of simply using a taper-funnel structure for the mode matching between two types of waveguides is typically insufficient for high coupling efficiency. Here we propose the use of an additional silicon strip-to-slot mode converter, which has a low insertion loss itself and achieves better mode matching. The experimental results show the new design, with slot width fixed at 200nm, achieves a higher coupling efficiency than conventional one. The newly implemented design has 1.5 dB less loss than the conventional taper-funnel coupler, with a theoretical coupling loss of 2.18 dB/coupler and an experimentally measured loss of 3 dB/coupler at 1640nm wavelength.
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Bingqing Zhu, Bingqing Zhu, H. K. Tsang, H. K. Tsang, } "A new design for coupling light between silicon strip waveguide and plasmonic slot waveguide ", Proc. SPIE 9753, Optical Interconnects XVI, 97531A (15 March 2016); doi: 10.1117/12.2211575; https://doi.org/10.1117/12.2211575
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