Tunable plasmonic band stop filter based in graphene nanoribbon

In this work we suggest and analyze a simple and compact structure that can work as a graphene-based plasmonic band stop filter for the THz region. The device is formed by graphene nanoribbons, where the propagation and blocking of surface polariton plasmon waves occurs, which fully return to the device's input port. The graphene nanoribbons are deposited on a two layer dielectric substrate formed by SiO2 (silica) and Si (silicon). The band stop filter can be dynamically controlled by applying an electrostatic field that changes the chemical potential of graphene, changing the filter's operating range. Numerical simulations show that the insertion losses reach levels around-55 dB with a bandwidth of 7.3 THz, showing that the device has good performance for the frequency range used in our work and can be used for future applications.