An Optically Transparent Metamaterial Window Based on Metal Meshes With Integrated Absorption and Transmission

This work presents an absorptive–transmissive integrated metamaterial window using a quartz substrate and micrometer‐scale metallic meshes. The structure employs a three‐layer design comprising a resonant layer, a dielectric spacer, and a frequency‐selective surface. It achieves an average visible transmittance of 68.5% over 380–780 nm, along with a dual‐band microwave response: an average absorption of 85% in the 5–11.4 GHz band and a transmittance that rises from 20 GHz and peaks around 34 GHz. The low‐frequency absorption originates from localized surface plasmon resonance in the top layer, whereas the high‐frequency transmission results from multilayer interference. This work provides a design strategy for integrated windows capable of simultaneously managing optical and microwave radiation.