Magneto-optical responses of microcavity-integrated graphene photonic crystals in the infrared spectral region

• The magneto-optical responses of microcavity integrated graphene photonic crystals were studied.
• The spectra of circular eigenmodes and their phases were investigated.
• The effects of graphene layer thickness and refractive indices of graphene adjacent layers in the structure were studied.
• High performance microcavity integrated graphene photonic crystal structure was proposed.

The magneto-optical responses and photonic band gap properties of the microcavity-integrated graphene photonic crystals were numerically studied. The structure consists of a graphene sheet embedded between two mirror symmetric Bragg reflectors, under the influence of an external static magnetic field. The properties of the microcavity resonance mode were investigated, considering the right- and left-handed circular polarization transmission coefficients and their phases, together with the Faraday rotation angle and ellipticity of the output light. The effects of the repetition number of the Bragg reflectors, thickness of the microcavity central layer and refractive indices of the graphene adjacent layers were considered. The obtained results revealed that a pure linear polarized output light with no ellipticity and high transmittance enhanced Faraday rotation can be achieved. These results can be utilized in designing a variety of graphene based photonic devices and magneto-optical integrated elements, such as miniaturized isolators or circulators.