Numerical Investigation of a Branch-Shaped Filter Based on Metal-Insulator-Metal Waveguide

Abstract

Using the finite difference time-domain method, we present a comprehensive numerical investigation of a branch-shaped filter based on the metal-insulator-metal (MIM) waveguide. The results show that several passbands and stopbands appear in the transmission spectra, which are resulted by the phase differences between the surface plasmon polaritons (SPPs) propagating along the straight waveguide and the SPPs resonating in the circuit formed by the branch and the straight waveguide. The effects of the structural parameters of the branch-shaped filters on their transmission properties are also studied. These results not only present an alternative plasmonic filter for the MIM waveguides but also help us to understand the transmission properties of the circuit-shaped structures.

Fano Resonance Based on Metal-Insulator-Metal Waveguide-Coupled Double Rectangular Cavities for Plasmonic Nanosensors

“…The TM 0 model equation in the MIM waveguide is [ 15 , 32 ]: where k and d are the wave vector in the waveguide and the width of the MIM waveguide, respectively. The parameters p and α c in Equation (3) are defined as p = ε in /ε m and α c = [ k 0 2 (ε in − ε m ) + κ] 1/2 .…”

“…Metal-insulator-metal (MIM) waveguide-coupled resonators have attracted considerable research interest because of their easy on-chip integration and deep-subwavelength confinement of light [ 13 , 14 ]. Many photonic devices based on MIM waveguides have been designed and investigated, such as filters [ 15 ], wavelength division multiplexers [ 16 ], and high-sensitivity plasmonic sensors [ 17 ]. Plasmonic sensors based on MIM waveguides [ 13 , 14 , 18 ] have received considerable research interest because of the need for ultrahigh-sensitivity biochemical sensors [ 19 , 20 ].…”

A Refractive Index Sensor Based on a Metal-Insulator-Metal Waveguide-Coupled Ring Resonator

“…SPP waveguides, including insulator-metal-insulator (IMI) waveguides [ 9 ], metal-insulator-metal (MIM) waveguides [ 10 ] and combined waveguides [ 11 ], have been widely studied. Among these waveguides, MIM waveguides, in particular, exhibit low transmission loss and strong localized field confinement [ 12 , 13 , 14 ], and have led to the development of sub-wavelength photonic devices such as splitters [ 15 ], couplers [ 16 , 17 ], and filters [ 18 , 19 , 20 ]. These devices are basically composed of waveguides and resonators.…”

The Filter Characteristic Research of Metal-Insulator-Metal Waveguide with Double Overlapping Annular Rings

“…To date, the insulator-meta-insulator (IMI) waveguides and metal-insulator-metal (MIM) waveguides have also been studied. Compared with IMI waveguides [4,5], the MIM waveguides have smaller mode sizes, longer SPPs propagation lengths, and easily fabricated properties [6][7][8][9][10][11]. Various MIM optical wavelength components based on the SPPs have been proposed and investigated from both theory and experiment, such as splitters [7], filters [8,9], couplers [10], and combiners [11].…”