A high-performance ultra-wideband metasurface absorber and thermal emitter for solar energy harvesting and thermal applications

substrate. This device achieves greater than 90% of the aggregative absorption over the 4133 nm ultra-wideband region ranging from 867 nm to 5000 nm. Within its operational band, the solar absorber exhibits excellent solar energy storage capabilities under the solar AM 1.5 model curve. Furthermore, the absorber structure maintains a stable thermal radiation efficiency of 94.5-95.5% over the temperature range of 300-700 K. In addition, the physical mechanism underlying the device's ultra-wideband high absorption characteristics is adequately explained using impedance matching theory and the distribution of surface current density at high absorption wavelengths. The proposed structure design's symmetry shows excellent resilience to polarization state variations as well as wide angular stability to maintain high absorption rate. Given all of these advantages, the proposed structure would be highly suitable for solar energy and thermal radiation applications.