Metasurface with Electrically Tunable Microwave Transmission Amplitude and Broadband High Optical Transparency

Metasurfaces with tunable microwave transmission amplitude and broadband high optical transparency hold great promise for the next generation of optically transparent and smart electromagnetic transmission devices. In this study, a novel and electrically tunable metasurface with high optical transparency in the visible-infrared broadband is proposed and fabricated by integrating meshed electric-LC resonators and patterned VO₂. Simulations and experiments demonstrate that the designed metasurface has a normalized transmittance greater than 88% over a wide wavelength range of 380-5000 nm, and the transmission amplitude can be continuously tuned from -1.27 to -15.38 dB at 10 GHz under current excitation, indicating significantly limited passband loss and strong electromagnetic shielding capability in the on and off cases, respectively. This study provides a simple, practical, and feasible method for optically transparent metasurfaces with electrically tunable microwave amplitude, paving the way for the application of VO₂ in multiple fields such as intelligent optical windows, smart radomes, microwave communications, and optically transparent electromagnetic stealth.