Optical nonlinearity and non-reciprocal transmission of graphene integrated metasurface

Non-reciprocal phenomena generated by optical nonlinear effects without the requirement of external bias have important applications in modern photonics. In this paper, an optical nonlinear metasurface based on monolayer graphene integrated silicon resonant gratings is proposed. It is numerically confirmed that this type of metasurface can excite high-Q guided mode resonances in the communication band with normal incidence. Significant optical Kerr effect is achieved in the metasurface through high third-order polarization coefficient of graphene, and by changing the width and depth of the grating, the nonlinear effect of the metasurface can be effectively controlled to realize the application under different illumination conditions. In addition, remarkable non-reciprocity phenomenon is realized at an incident intensity of 0.085 GW/m(2). As an example, with a forward transmittance of 0.732 and a backward transmittance of 0.025, an optical diode is implemented at 1549.1 nm. (c) 2020 Elsevier Ltd. All rights reserved.

Automated summary

This paper proposed an optical nonlinear metasurface based on monolayer graphene integrated silicon resonant gratings, which can excite high-Q guided mode resonances in the communication band and achieve significant optical Kerr effect. By changing the parameters of the grating, the nonlinear effect can be effectively controlled to realize different applications. Furthermore, remarkable non-reciprocity phenomenon is realized at a certain incident intensity, allowing the implementation of an optical diode.