To Naoki, Juodkazis Saulius, Nishijima Yoshiaki
Department of Electrical and Computer Engineering, Graduate School of Engineering, Yokohama National University, 79-5 Tokiwadai, Hodogaya-ku, Yokohama 240-8501, Japan.
Optical Sciences Centre and ARC Training Centre in Surface Engineering for Advanced Materials (SEAM), School of Science, Swinburne University of Technology, Hawthorn, VIC 3122, Australia.
Micromachines (Basel). 2020 Apr 14;11(4):409. doi: 10.3390/mi11040409.
Realisation of a perfect absorber A = 1 with transmittance and reflectance T = R = 0 by a thin metasurface is one of the hot topics in recent nanophotonics prompted by energy harvesting and sensor applications ( A + R + T = 1 is the energy conservation). Here we tested the optical properties of over 400 structures of metal-insulator-metal (MIM) metasurfaces for a range of variation in thickness of insulator, diameter of a disc and intra-disc distance both experimentally and numerically. Conditions of a near perfect absorption A > 95 % with simultaneously occurring anti-reflection property ( R < 5 % ) was experimentally determined. Differences between the bulk vs. nano-thin film properties at mid-IR of the used materials can be of interest for plasmonic multi-metal alloys and high entropy metals.
通过薄超表面实现吸收率A = 1且透射率和反射率T = R = 0的完美吸收体，是近期纳米光子学领域的热门话题之一，这是由能量收集和传感器应用所推动的（A + R + T = 1是能量守恒定律）。在此，我们通过实验和数值模拟，测试了400多种金属-绝缘体-金属（MIM）超表面结构在绝缘体厚度、圆盘直径和盘内间距等一系列变化情况下的光学特性。通过实验确定了接近完美吸收（A > 95%）且同时具有抗反射特性（R < 5%）的条件。所使用材料在中红外波段的体材料与纳米薄膜特性之间的差异，对于等离子体多金属合金和高熵金属可能具有重要意义。
