Nonlinear modulation of terahertz waves based on a MAPbI3/Gold/Si Hybrid Plasmon-Induced Transparency (PIT) metasurface

As a kind of artificial electromagnetic device, metasurface is applicable in many areas for its distinctive characteristics. Plasmon-Induced Transparency (PIT) is a typical application of metasurface, with special electromagnetic characteristics such as high Q-factor and slow light effect. However, most of the current work has paid little attention to the ability of nonlinear manipulation of PIT metasurface. Using the excellent photoconductivity effect of MAPbI3 Perovskite, it is possible to design optically controlled nonlinear modulation devices based on a hybrid PIT metasurface and achieve an effective manipulation of terahertz waves. In this paper, a MAPbI3-Gold-Si hybrid metasurface is designed and fabricated to achieve a high Q-factor PIT effect. The experiment implies that the PIT metasurface can be actively and nonlinearly modulated with high efficiency after spin-coating the MAPbI3 film. In addition, the hybrid PIT metasurface is compatible with integrated circuit (IC) technology, hence it may provide a potential way in the region of terahertz communication, active filters, highly sensitive sensors and slow-light devices.