Simulation App for Square-Ring Solar Absorbers Based on Metasurfaces

For efficient utilization of solar spectrum energy within 300-2500 nm, we propose a broadband solar absorber based on a metasurface with square-hollow configuration. The trilayer design employs "metal substrate/SiO2dielectric layer/hollow metal structure". Using COMSOL simulations, we investigate the regulatory mechanisms of material and geometric parameters on absorption performance. When zirconium (Zr) serves as the functional metal layer, the average absorption achieves 85% across 300-2500 nm, with peak efficiency approaching 100% at 1500 nm in the near-infrared regime. A COMSOL App is co-developed to democratize access, enabling cross-disciplinary intuitive control of geometric parameters. This explicitly validates Zr's broadband superiority from low-loss plasmonic resonance. The design accommodates fabrication processes including electron-beam lithography, providing an innovative pathway for solar power generation and photothermal conversion applications.