Mattiucci N, Bloemer M J, Aközbek N, D'Aguanno G
AEgis Tech., Nanogenesis Division 410 Jan Davis Dr, Huntsville, AL 35806, USA.
Sci Rep. 2013 Nov 13;3:3203. doi: 10.1038/srep03203.
Metals are generally considered good reflectors over the entire electromagnetic spectrum up to their plasma frequency. Here we demonstrate an approach to tailor their absorbing characteristics based on the effective metamaterial properties of thin, periodic metallo-dielectric multilayers by exploiting a broadband, inherently non-resonant, surface impedance matching mechanism. Based on this mechanism, we design, fabricate and test omnidirectional, thin (<1 micron), polarization independent, extremely efficient absorbers (in principle being capable to reach A > 99%) over a frequency range spanning from the UV to the IR. Our approach opens new venues to design cost effective materials for many applications such as thermo-photovoltaic energy conversion devices, light harvesting for solar cells, flat panel display, infrared detectors, stray light reduction, stealth and others.
在高达其等离子体频率的整个电磁频谱范围内，金属通常被视为良好的反射体。在此，我们展示了一种方法，通过利用薄的周期性金属 - 电介质多层结构的有效超材料特性，基于宽带、固有非共振的表面阻抗匹配机制来调整其吸收特性。基于此机制，我们设计、制造并测试了全向、薄（<1微米）、偏振无关、极其高效的吸收体（原则上能够达到A>99%），其频率范围涵盖从紫外到红外。我们的方法为设计用于许多应用的经济高效材料开辟了新途径，如热光伏能量转换装置、太阳能电池的光捕获、平板显示器、红外探测器、杂散光减少、隐身等。
