Graphene-based multifunctional signal divider in THz region

Abstract

Here, we report the design and numeric-theoretical study of a power divider working at two different regimes in THz range based on graphene. The device is composed by a graphene disk resonator and eight graphene waveguides linked to the resonator. This graphene set is placed on a dielectric substrates stacking. Under a bias voltage applying between the graphene set and the dielectric substrate set, the divider works into biasing voltage (B.V.) regime by splitting the signal input power and increasing the ports number of transmission (from three to five output ports). Otherwise, when the resonator is undergone a DC magnetic field, the device works in magneto-plasmon (M.P.) regime by splitting the input power in similar manner as B.V. regime, but the transmission and isolation ports are different, which leads to the source protection. The working principle of B.V. and M.P. regimes are based on dipole and quadrupole resonances configurations as a function of applied external electric and magnetic fields, respectively. These two modes are excited by surface plasmon-polariton waves propagating in the graphene waveguides. Both regimes work as selector switches and provide fine results in transmission, isolation and reflection.