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Analysis of Mid-Infrared Surface Plasmon Modes in a Graphene-Based Cylindrical Hybrid Waveguide
Authors:Jian-Ping Liu  Xiang Zhai  Ling-Ling Wang  Hong-Ju Li  Fang Xie  Qi Lin  Sheng-Xuan Xia
Affiliation:1.School of Physics and Electronics,Hunan University,Changsha,China;2.College of Physics Science and Engineering Technology,Yichun University,Yichun,China
Abstract:A graphene-based cylindrical hybrid surface plasmon polariton waveguide, composed of a silicon nanowire core surrounded by a silica layer and then a graphene layer, is investigated using the finite-difference time-domain method. The analytical solutions and the numerical simulation show that an ultra-small mode area and a large propagation length can be achieved with this waveguide. Utilizing the perturbation theory of coupled mode, we demonstrate that the six lowest-order coupling modes originate from the coupling of the three lowest-order single-waveguide modes, and the m?=?1 order yy-coupling mode possesses the maximum coupling length and the minimum crosstalk. This waveguide can be used for photonic integrated circuits in the mid-infrared range.
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