A novel and simple multi-wavelength band-pass filter based on
metal-insular-metal (MIM) waveguide with different nanodisk cavity is proposed and
investigated numerically by Finite-Element-Method (FEM) simulations. According to
resonant theory of nanodisk, multi-wavelength band-pass filter can be achieved for
different wavelength. It also shows that the transmission characteristics of the filter and
the resonant wavelength can be easily manipulated by changing the gap between
nanodisk and straight waveguide or changing the radius of the nanodisk. This kind of
plasmonic waveguide filter may become important promising application in highly
plasmonic integrated circuits.
A nonlinear hybrid plasmonic waveguide (HPW) with a metal cap on a nonlinear material-on-insulator rib is proposed. By using a finite-difference time-domain method, its light confinement and effective nonlinearity coefficient of the Kerr effect for all-optical switches are analyzed in detail. Numerical simulations illustrate that the nonlinear HPW structure has nanoscale confinement and high effective nonlinearity coefficient at the wavelength of 1550 nm. Consequently, the HPW can be used in all-optical signal processing of integrated photonics.
The special abilities of plasmonic waveguide including tight field confinement and beyond diffraction limit within nano-scale structure have been exploited in many different fields. In order to overcome the trade-off between tight mode confinement and long propagation length, many kinds of nano-scale structures have been proposed in recent years. In this paper, a novel hybrid plasmonic waveguide consisting of the layer of metal Ag, a spherical cap with low-index dielectric layer placed above the metal Ag and a high-index dielectric layer placed above the spherical cap is proposed and analyzed theoretically. The relations between the characteristics of the bound modes, such as mode confinement, propagation lengths, and parameters of the spherical cap, the curvature and width, are numerically investigated in detail. The simulation results show that the nano-scale confinement can be realized. The simulation result shows that the performance of the proposed spherical cap hybrid plasmonic waveguide is better than the rectangle or cylindrical hybrid plasmonic waveguide. Such hybrid plasmonic waveguide has a tight mode confinement and long propagation length. This novel structure provides a promising application for high-integration density photonic components.