四带近完美吸收双曲超构材料（英文）

Four-band near-perfect absorption of hyperbolic metamaterials

当前的多带近完美吸收通常是利用多层叠堆或多特征尺寸组合阵列结构来实现,这给实验制备带来了一定的难度.本文从理论上提出了吸收率高达99%的四窄带近完美吸收,它是通过将单特征尺寸的金属和介电材料阵列置于金属衬底之上而构成.其四带近完美吸收的机理可通过求解双曲超构材料的色散关系,结合波导理论来解释.此外,由于这种多带近完美吸收具有高品质因子的特点,对外界环境的变化较为敏感,因而本文也就其在传感器方面的潜在应用进行了讨论.

Multi-layer stacking or multi-sized array is generally employed to realize multi-band near-perfect absorption,from which the complexities arise in preparation.In this work,a four-band absorber with narrow bands and absorptance over0.99at infrared wavelengths is proposed based on theory,which presents a single-sized array with a metallic and a dielectric layer on a metal substrate.The origin of the four-band near-perfect absorption is explained by studying the dispersion relation of hyperbolic metamaterials in combination with the waveguide theory.It is found that the multi-band near-perfect absorption with high quality factors is sensitive to variation of surrounding environments,which projects potential applications as a biosensor.