Analysis of Mid-Infrared Surface Plasmon Modes in a Graphene-Based Cylindrical Hybrid Waveguide

• DOI: 10.1007/s11468-015-0095-z
• Publication Date: 2015-10-12T23:03:56Z
• Authors: Jian-Ping Liu; Xiang Zhai; Ling-Ling Wang; Hong-Ju Li; Fang Xie; Qi Lin; Sheng-Xuan Xia
• Keywords: 0103 physical sciences; 7. Clean energy; 01 natural sciences

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.