Dual-frequency-range modulator based on a planar nested multiscale metasurface

Multi-spectral and multi-functional optical components play a crucial role in fields such as high-speed communications and optical sensing. However, the interaction between different spectra and matter varies significantly, making it challenging to simultaneously achieve dynamic multi-spectral modulation capabilities. We designed a modulator based on a planar nested multiscale metasurface, incorporating silicon (Si) and perovskite as control materials, to modulate both microwave and terahertz (THz) ranges. Modulation of microwave and THz waves is achieved through visible light and near-infrared light pumping, with modulation depths of 94.03% and 90.77%, respectively. The modulator employs a planar nested multiscale metasurface, utilizing the odd-order nonlinear polarization properties of perovskite in the THz range and the linear absorption properties of Si in the microwave range to realize dual-frequency-range modulation. This research offers innovative insights for designing multi-spectral components applicable in all-optical coding metasurfaces and intelligent light windows.