Design and simulation of voltage controlled plasmonic 4*1 switch based on graphene ribbons

In this paper, a novel plasmonic optical switch based on graphene is designed and simulated with better features and four channels. Each of these channels has an equal width of 20nm which constructed from graphene ribbons spaced at a distance of 30nm from each other. The operation of device is based on the modulation of graphene chemical potential in each channel by using applied voltage. This means that by application of a proper voltage the transmission of input in every channel can be controlled and hence the switching can be occurred. Performance characteristics of this optical switch achieves a relatively high transmission with very low loss at the frequency of 30THz. Also in this structure the amount of crosstalk is remarkably low. This structure has been investigated in different chemical potentials in which one of it’s best status occurs in chemical potential of 0.4eV. All analyses and simulations have been performed in Lumerical and MATLAB.