A Wavelength Demultiplexing Structure Based on the Multi-Teeth-Shaped Plasmonic Waveguide Structure
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A Wavelength Demultiplexing Structure Based on the Multi-Teeth-Shaped Plasmonic Waveguide Structure O. Abbaszadeh-Azar 1 & K. Abedi 1 Received: 28 September 2019 / Accepted: 10 March 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract In this paper, a wavelength demultiplexing structure based on multi-teeth-shaped metal-insulator-metal (MIM) plasmonic waveguide is designed and numerically studied using the finite-difference time-domain (FDTD) method. Investigating the characteristics of a multi-teeth-shaped plasmonic waveguide structure reveals that with the design of the structure, it was possible to create a mode inside the bandgap of the filter. Based on the created mode inside the bandgap of the filter, the demultiplexer structure has been proposed and investigated. By changing the geometric parameters of the structure, the transmission wavelength of the demultiplexer channel can be adjusted. The proposed demultiplexer can be used in integrated optical circuits. Keywords Wavelength demultiplexing structure . Multi-teeth shape . Plasmonic . Demultiplexer
Introduction Surface plasmon polaritons (SPPs) have the potential to reach integrated optical circuits due to their capability to confine and propagate electromagnetic waves at subwavelength [1, 2]. Various structures are proposed and built [3] based on SPPs such as metallic nanoparticle chains [4, 5], nanowires [6], insulator-metal-insulator (IMI) waveguides [7, 8], and metalinsulator-metal (MIM) waveguides [9–13]. Among these, the MIM waveguides have such unique features as the possibility of high integration in optical integrated circuits. They are used in some devices such as filters, sensors, multiplexers, and demultiplexers [14–16]. Some of the devices that have been studied numerically and experimentally include Bragg reflectors [17, 18], filters based on tooth-shaped waveguide [11, 19–23] and ring resonator filters [24–26]. Demultiplexer structures are one of the most important devices in optical communication. Plasmonic MIM cavity-based demultiplexer [27–30], ring resonators [31–33], and demultiplexer with the nonlinear material are among the plasmonic filters and demultiplexers based on MIM waveguides that have been numerically and experimentally investigated [34]. The present study is an attempt to propose and numerically * K. Abedi [email protected] 1
Faculty of Electrical Engineering, Shahid Beheshti University, Tehran, Iran
analyze a demultiplexing structure based on multi-teethshaped plasmonic waveguide.
Numerical Method In the numerical method, using FDTD method, for the structure of multi-teeth-shaped plasmonic waveguide, the spatial grid size was assumed to be 1x = 1y = 5 nm so that the results converge. The simulation system is assumed to be in the form of a two-dimensional box in which the light is propagating in the x-direction. The boundary conditions are assumed to be PML to eliminate reflection waves for both x and y boundaries [35]. In this simulation, Ag is used as the metal of our structure due to it
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