Walker Jean Paul, Swaminathan Venkataraman, Haynes Aisha S, Grebel Haim
Electronic Imaging Center and Electrical Engineering Department, New Jersey Institute of Technology, Newark, NJ 07102, USA.
U.S. Army Combat Capabilities Development Command Armaments Center, Picatinny, NJ 07806, USA.
Materials (Basel). 2019 Jun 30;12(13):2108. doi: 10.3390/ma12132108.
Multi-layer, metallo-dielectric structures (screens) have long been employed as electromagnetic band filters, either in transmission or in reflection modes. Here we study the radiation energy not transmitted or reflected by these structures (trapped radiation, which is denoted-absorption). The trapped radiation leads to hot surfaces. In these bi-layer screens, the top (front) screen is made of metallic hole-array and the bottom (back) screen is made of metallic disk-array. The gap between them is filled with an array of dielectric spheres. The spheres are embedded in a dielectric host material, which is made of either a heat-insulating (air, polyimide) or heat-conducting (MgO) layer. Electromagnetic intensity trapping of 97% is obtained when a 0.15 micron gap is filled with MgO and Si spheres, which are treated as pure dielectrics (namely, with no added absorption loss). Envisioned applications are anti-fogging surfaces, electromagnetic shields, and energy harvesting structures.
多层金属-电介质结构（屏蔽层）长期以来一直被用作电磁带通滤波器，工作模式可以是透射模式或反射模式。在此，我们研究这些结构未透射或反射的辐射能量（俘获辐射，记为吸收）。俘获辐射会导致表面发热。在这些双层屏蔽层中，顶部（正面）屏蔽层由金属孔阵列制成，底部（背面）屏蔽层由金属盘阵列制成。它们之间的间隙填充有一排电介质球体。这些球体嵌入到一种电介质主体材料中，该主体材料由隔热（空气、聚酰亚胺）或导热（氧化镁）层制成。当0.15微米的间隙填充有氧化镁和硅球体（将其视为纯电介质，即无附加吸收损耗）时，可实现97%的电磁强度俘获。预期应用包括防雾表面、电磁屏蔽和能量收集结构。
