A flexible broadband absorber based on an all-dielectric multilayer structure is proposed to get an average absorbance of 97.4%, covering the whole visible light. Additionally, such high absorption presents an extraordinary angular tolerance of up to ${\pm}{{50}}^\circ$. Due to the single broadband resonance in the highly lossy Fabry–Perot (F–P) cavity and the intrinsic loss property of Ge, the proposed multilayer structure achieves the broadband absorption effect. Furthermore, the simple all-dielectric multilayer configuration requires no noble metal, making the lithography-free, large-scale, cost-effective manufacturing process feasible. Meanwhile, the good substrate adaptation facilitates its preparation on a flexible substrate. Accordingly, a three-dimensional object covered by the proposed flexible absorber can be treated as a two-dimensional black hole, revealing the effect of stealth. The proposed perfect absorber shows potentials for camouflage coating, solar energy collection, flexible optoelectronics, and other fields.

中文翻译：

---

基于全介电多层结构的无光刻柔性可见光宽带吸收剂

提出了一种基于全介电多层结构的柔性宽带吸收剂，其平均吸收率为97.4％，覆盖了整个可见光。此外，如此高的吸收率可提供高达$ {\ pm} {{50}} ^ \ circ $的超凡角度公差。由于高损耗法布里-珀罗（FP）腔中的单宽带谐振和Ge的固有损耗特性，所提出的多层结构实现了宽带吸收效果。此外，简单的全电介质多层结构不需要贵金属，这使得无光刻，大规模，经济高效的制造工艺成为可能。同时，良好的基材适应性有助于其在柔性基材上的制备。因此，被提出的挠性吸收体覆盖的三维物体可以被视为二维黑洞，从而揭示了隐身效果。拟议中的完美吸收体具有伪装涂层，太阳能收集，柔性光电等领域的潜力。