Enhancing the Faraday rotation in the monolayer phosphorus base of magneto-photonic crystals

Abstract We present a theoretical study on enhancing the Faraday rotation of the monolayer phosphorus in a symmetric one-dimensional defective magneto-photonic crystal. The results show that by embedding the monolayer black phosphorus in the defect layer, the Faraday rotation angle can be significantly enhanced due to the defect mode of the magneto-photonic crystal that can strongly confine the electromagnetic field in the vicinity of the black phosphorus. The enhanced Faraday rotation angle may be increased in proportion to the external magnetic field while keeping the working wavelength and transmittance basically unchanged. The enhanced Faraday rotation can reach a gain of 20.9 dB with a transmission exceeding 60% with the applied magnetic field of 5 T after introducing the defect mode. Moreover, the Faraday rotation and the operating wavelength can be tunable using the width of the thickness of the defect layer, the incident angle, and the electron doping.