A compact graphene-based dual-band band-stop filter using new hook-shaped resonator for THz applications

This paper presents a plasmonic Dual-band band-stop filter for terahertz frequencies using new graphene hook -shaped resonators. The structure of this filter is formed by placing two novel symmetrical resonators in the main waveguide path. The finite-difference time-domain (FDTD) and transmission line methods are used to analyze the proposed filter. This adjustable filter has a high-quality factor and two resonance modes in frequencies of 4.1 THz and 13.8 THz. Furthermore, the simulation results show a shift in the resonant frequencies upon changing the base length of the resonators. The designed filter has very small dimensions (350 nm x 500 nm) and can be a proper candidate for integrated optical circuits due to its compact structure and simple design.