Efficient broadband absorption of solar radiation is desired for sea water desalination, icephobicity and other renewable energy applications. We propose an idea of superimposing two high-loss resonances to broaden bandwidths of a few-layer absorber, which is made of dielectric/ metal/dielectric/ metal layers. Both the simulation and experiment show that the structure has an averaged absorption efficiency higher than 97% at wavelengths ranging from 350 to 1200 nm. The bandwidth of the absorption larger than 90% is up to 1000 nm (410–1410 nm), which is greater than that (≤ 750 nm) of previous MIM planar absorbers. Especially, the average absorption from 350 to 1000 nm is kept above 90% at an incidence angle as high as 65°, meanwhile still maintained above 80% even at an incident angle of 75°. The performance of angular insensitivity is much better than that of previous few-layer solar absorbers. The flexible 1D nonoble metasurface absorbers are fabricated in a single evaporation step. Under the illumination of a halogen lamp of P = 1.2 kW/m², the flexible metasurface increases its surface temperature by 25.1 K from room temperature. Further experiments demonstrate that the heat localization rapidly melts the accumulated ice. Our illumination intensity (P = 1.2 kW/m²) is only half of that (P = 2.4 kW/m²) in previous solar anti-ice studies based on gold/TiO₂ particle metasurfaces, indicating that our metasurface is more advantageous topractical applications. Our results illustrate an effective pathway toward the broadband metasurface absorbers with the attractive properties of mechanical flexibility, low cost of the no-noble metals, and large-area fabrications, which have promising prospects in the applications of solar heat utilization.

对于海水淡化，憎冰性和其他可再生能源应用，需要有效地宽带吸收太阳辐射。我们提出了将两个高损耗共振叠加以加宽由电介质/金属/电介质/金属层制成的几层吸收体的带宽的想法。仿真和实验均表明，该结构在350至1200 nm波长范围内的平均吸收效率高于97％。大于90％的吸收带宽高达1000 nm（410-1410 nm），大于以前的MIM平面吸收器的带宽（≤750 nm）。特别地，在高达65°的入射角下，从350nm至1000nm的平均吸收保持在90％以上，同时即使在75°的入射角下仍保持在80％以上。角不敏感性的性能比以前的几层太阳能吸收器好得多。柔性一维非球形超表面吸收器是在单个蒸发步骤中制造的。在卤素灯的照明下P  = 1.2 kW / m ²，柔性超表面的表面温度比室温增加了25.1K。进一步的实验表明，热量的局部化使融化的冰迅速融化。我们的照明强度（P  = 1.2千瓦/米²）是仅一半的（P  = 2.4千瓦/米²）在基于金以前太阳能防冰研究/二氧化钛₂粒子超表面，表明我们的超表面是更有利的拓朴应用。我们的结果说明了具有机械柔韧性，低价贵金属的低成本和大面积制造等诱人特性的宽带超表面吸收器的有效途径，在太阳能热利用的应用中具有广阔的前景。