Dynamic near-field display based on a Friedrich–Wintgen bound state in the continuum

Friedrich-Wintgen (FW) bound states in the continuum (BICs), as a kind of optical BICs, basically relie on changing the angle of incidence and polarization for its dynamic implementation. Here, we explore the realization of an FW BIC in a hybrid guided-mode resonance (GMR) and Fabry-Pérot resonance (FPR) system consisting of two layers of graphene and dielectric SiO2. The band structure and field distribution demonstrate the location of the proposed BIC is at 44 THz. Further studies show that changes in the Fermi level of graphene1 can dynamically achieve the FW BIC. Considering the significant difference in the electric field intensity corresponding to the GMR and FW BIC states, the dynamic near-field display can be achieved by applying different gate voltages. This work provides theoretical guidance for FW BIC in image display and data encryption.