Graphene-based magneto-optical THz modulator with 100% depth of modulation for communication purposes

In this article, we introduce a Faraday modulator based on graphene, gyroelectric (InSb), SiO2, and Si materials at 0.35 THz, considered as a band of the atmospheric window promising for the future wireless communications. The maximum value of Faraday rotation, transmission and depth of modulation are obtained at 0.35 THz for low static magnetic field B as 45 deg, 80%, and 100%, respectively. The THz signal transmission can be modified from 0 to 80% by varying applied static magnetic fields. This design opens up a new way for ultrathin magneto-optical nanophotonic devices to realize polarization modulators with high transmittance in the THz band. •Enhancing Faraday rotation is an important necessity for integrated THz modulator.•The use of low static magnetic field is a strong point of this work.•100% depth of modulation, high transmission and 45 deg rotation have been achieved.