Multispectral Shared-Aperture Metasurface With RF Wide-Angle and Polarization Stability for Tri-Band Transmission and...

The integration of multispectral, efficient, and stable radio-frequency (RF) transmission and high-fidelity imaging within a single optical window represents a critical yet challenging goal for low-altitude aircraft (LAA) electro-optical pods. Here, this paper proposes an optically transparent multispectral shared-aperture metasurface (OMSM) with RF wide-angle and polarization stability, which leverages a novel two-dimensional spatially independent control strategy to overcome the aforementioned limitation. The unique mechanism unlocks superior dual-mode optical and RF cross-spectral performance. Design results demonstrate that it maintains high transmission efficiency across three bands ( $>-$ 1 dB at 2-3 & 5-6 GHz and $>-$ 1.5 dB at 3.8-4.1 GHz) and stable in-band interference suppression (average $<-$ 10 dB) within the 2-6 GHz spectrum. A minimal and independent set of low-duty-cycle RF modulating units works synergistically to deliver high transmittance across the visible (VIS) and near-infrared (NIR) spectrum ( $>$ 94% at 380-1800 nm) with low imaging distortion. The prototype was fabricated using a large-area low-cost reproducible process, and the measured results show excellent agreement with the numerical simulations. This work provides a viable and easily implementable paradigm for designing cross-spectrum cooperative devices.