Modeling and Study of Nano-plasmonic Couplers of Different Shapes with Analytical Assessment Employing GaAs

Abstract

One of the major advantages offered by the plasmonic devices is its ability to overcome diffraction limit of light that emerges due to miniaturization of the devices. In order to serve this purpose plasmonic couplers of different shapes have been proposed. The proposed couplers consist of two types of waveguides; they are- Dielectric waveguide and MDM (Metal-Dielectric-Metal) waveguide. While designing the dielectric waveguide GaAs has been chosen as the key material. In MDM waveguide silver has been chosen as metal and air as dielectric. After designing the basic structures, different physical parameters were varied to optimize the performance of them. The performance of the proposed devices has been analyzed in terms of reflectance, admittance and transmitted energy. Here, the performance deviation was ascertained varying the wavelength of the applied signal. Alternating the dimensions of the proposed nano-plasmonic coupling device, coupling efficiency, reflection coefficient and absorption coefficient were computed. Finally, novel architectures have been achieved which provides us the maximum efficiency.