Multispectral Hierarchical Metamaterials with Broadband Microwave Absorption, Gradient Infrared Emissivity, and High Visible Transparency. - Meng, Zhen; Liu, Dongqing; Pang, Yongqiang; Wang, Jiafu; Jia, Yan; Wang, Xinfei; Cheng, Haifeng (Advanced Materials Technologies, 2025)