title: Novel hybrid plasmonic waveguide consisting of two identical dielectric nanowires symmetrically placed on each side of a thin metal film.
abstract: It is well-known that, a dielectric cylinder on a metal surface offers the advantage of not yielding singular field, which would effectively reduce the propagation loss as opposed to a rectangle-shaped waveguide on a metal surface. In this article, a novel hybrid plasmonic waveguide consisting of two identical dielectric nanowires symmetrically placed on each side of a thin metal film is presented. With the strong interaction between the dielectric cylindrical waveguide mode and long-range surface plasmon polaritons (LRSPP) mode of a thin metal film, deep-subwavelength mode confinement can be achieved. Compared with the hybrid plasmonic mode guided in only one dielectric nanowire above a metal film, a much larger propagation length as well as improved figure of merit (FoM) can be simultaneously realized. A typical propagation length is 434 μm, and optical field is confined into an ultra-small area of approximately 0.0096 μm at 1.55 μm. This structure could enable various applications such as nanophotonic waveguides, high-quality nanolasers, and optical trapping and transportation of nanoparticles and biomolecules.
authors.affiliation: Wuhan National Laboratory for Optoelectronics, School of Optoelectronic Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China. chen.lin@mail.hust.edu.cn
authors.forename: Lin
authors.initials: L
authors.lastname: Chen
authors.forename: Tian
authors.initials: T
authors.lastname: Zhang
authors.forename: Xun
authors.initials: X
authors.lastname: Li
authors.forename: Weiping
authors.initials: W
authors.lastname: Huang
mesh_terms: D004867:Equipment Design; D019544:Equipment Failure Analysis; D008567:Membranes, Artificial; D008670:Metals / Q000737:chemistry*; D043942:Nanotubes / Q000737:chemistry* / Q000648:ultrastructure*; D020349:Surface Plasmon Resonance / Q000295:instrumentation*
chemical_list: D008567:Membranes, Artificial; D008670:Metals