title: Plasmonic coaxial waveguide-cavity devices.
abstract: We theoretically investigate three-dimensional plasmonic waveguide-cavity structures, built by side-coupling stub resonators that consist of plasmonic coaxial waveguides of finite length, to a plasmonic coaxial waveguide. The resonators are terminated either in a short or an open circuit. We show that the properties of these waveguide-cavity systems can be accurately described using a single-mode scattering matrix theory. We also show that, with proper choice of their design parameters, three-dimensional plasmonic coaxial waveguide-cavity devices and two-dimensional metal-dielectric-metal devices can have nearly identical transmission spectra. Thus, three-dimensional plasmonic coaxial waveguides offer a platform for practical implementation of two-dimensional metal-dielectric-metal device designs.
authors.forename: Amirreza
authors.initials: A
authors.lastname: Mahigir
authors.forename: Pouya
authors.initials: P
authors.lastname: Dastmalchi
authors.forename: Wonseok
authors.initials: W
authors.lastname: Shin
authors.forename: Shanhui
authors.initials: S
authors.lastname: Fan
authors.forename: Georgios
authors.initials: G
authors.lastname: Veronis