Open AccessGraphene-based long-range SPP hybrid waveguide with ultra-long propagation length in mid-infrared range
Author(s) -
Jianping Liu,
Xiang Zhai,
Lingling Wang,
Hongju Li,
Fazhi Xie,
Shengxuan Xia,
Xiongjun Shang,
Xin Luo
Publication year - 2016
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.24.005376
Subject(s) - materials science , graphene , optics , surface plasmon polariton , waveguide , graphene nanoribbons , surface plasmon , infrared , coupled mode theory , photonics , optoelectronics , photonic crystal , range (aeronautics) , plasmon , refractive index , nanotechnology , physics , composite material
A graphene-based long-range surface plasmon polariton (LRSPP) hybrid waveguide, which is composed of two identical outer graphene nanoribbons and two identical inner silica layers symmetrically placed on both sides of a silicon layer, is investigated using the finite-difference time-domain method. By combining the simulated results with the coupled mode perturbation theory, we demonstrate that the LRSPP and short-range SPP (SRSPP) modes originate from the coupling of the same modes of the two graphene nanoribbons. For the LRSPP mode, an ultra-long propagation length (~10 μm) and an ultra-small mode area (~10 -7 A 0 , where A 0 is the diffraction-limited mode area) can be simultaneously achieved. This waveguide can be used for future photonic integrated circuits functional in the mid-infrared range.