论文标题
基于相变的超纤维吸收器超材料超级晶格
Ultra-Thin Absorber based on Phase Change Metamaterial Superlattice
论文作者
论文摘要
在本文中，有损底物上的超晶格VO2/SIO2超材料旨在创建一个几乎完美的吸收剂，并在红外光谱中具有可调性。我们选择了VO2，因为它提出了一种介电到金属样相的变化，略高于室温。此外，高温VO2的略有失误性质呈现出可见和红外部分的复杂折射率的可比和小的组成部分（真实和虚构）。加上有限的电导率底物，VO2已被用来创建高度吸收/发射结构，其中Vo2的厚度超薄（t << lambda/4n）。然而，类似金属的VO2并不具有整个红外光谱中复杂折射率的相当和小的组成部分，这限制了这种超薄的VO2吸收器设计的通用性。在这里，我们采用了VO2/SIO2的超薄超级晶格来创建一个复合材料超材料，该复合材料易于设计用于整个红外光谱的高吸光度。
In this paper, a superlattice VO2/SiO2 metamaterial on a lossy substrate is designed to create a near perfect absorber with tunability across the infrared spectrum. We selected VO2 as it presents a dielectric to metal-like phase change slightly above room temperature. Additionally, the slightly lossy nature of high-temperature VO2 presents comparable and small components (real and imaginary) of the complex refractive index across portions of the visible and infrared. Coupled with a limited conductivity substrate, VO2 has been employed to create highly absorbing/emitting structures where the thickness of the VO2 is ultra-thin (t << lambda/4n). Nevertheless, metal-like VO2 does not possess comparable and small components of the complex refractive index across the entire infrared spectrum, which limits the universality of this ultra-thin VO2 absorber design. Here we employ an ultra-thin superlattice of VO2/SiO2 to create a composite metamaterial that is readily designed for high absorbance across the infrared spectrum.
