基于电介质超材料的中红外超窄带吸波器

Mid-infrared ultra-narrowband absorber based on dielectric metamaterial

电介质超材料因具有极低欧姆损耗受到广泛关注.提出一种基于电介质超材料的中红外超窄带吸波器,该吸波器由顶层电介质微结构、中间层电介质膜和基底金属构成.研究结果表明:该吸波器在中红外波段存在带宽为2.40nm的吸收峰;电场主要分布于顶层硅微结构之间的间隙,导致吸收损耗功率显著降低,进而实现吸收带宽压缩;作为传感器时,在中红外波段该吸波器的品质因数可达80.可见,该吸波器可应用于中红外热辐射光源和高性能传感器.

Dielectric metamaterials have received extensive attention because of their extremely low ohmic losses.A mid-infrared ultra-narrowband absorber based on dielectric metamaterial had been proposed.The absorber consisted of a top dielectric microstructure layer,an intermediate dielectric film and a substrate metal.The research results indicated that the absorber had an absorption peak with a bandwidth of 2.40 nm in the mid-infrared band.The electric field was mainly distributed in the gaps between the top silicon microstructures,leading to a significant reduction in absorption loss power and thus the absorption bandwidth compression.When used as a sensor,the quality factor of the absorber in the mid-infrared band could reach 80.Therefore,this absorber could be applied to mid-infrared thermal emitters and high-performance sensors.