论文部分内容阅读
在纳米偶极子等效电路的基础上,结合多层波导与谐振腔结构,设计了一种高吸收率、宽波段的纳米超材料太阳能吸收器。该吸收器的单元结构是由双六边形超材料纳米柱与Si圆环柱组成,其中Si圆环中镶嵌了8个微型Au纳米圆柱。采用时域有限差分方法分析了纳米超材料吸收器在宽波段、不同偏振状态的入射光以及大角度入射光下的吸收特性。数值分析表明,该吸收器的吸收波段主要集中在400~1500nm,其平均吸收率可以达到94%。不同偏振状态的入射光对吸收器的吸收率影响较小,且在±60°大入射角度时该吸收器的平均吸收率仍可达到90%。该吸收器宽波段的高吸收率是由慢波效应与局域表面等离子体共振的共同作用引起的。
Based on the nano-dipole equivalent circuit, combined with multilayer waveguide and resonator structure, a nano-material sunsor absorber with high absorptivity and wide band is designed. The cell structure of the absorber consists of a double hexagonal metamaterial nano column and a Si circular column, in which eight micro Au nano columns are embedded in the Si ring. The time-domain finite difference method is used to analyze the absorption characteristics of nanometer metamaterial absorbers in wide band, incident light with different polarization states and incident light at large angles. Numerical analysis shows that the absorption band of the absorber mainly concentrates at 400 ~ 1500nm, the average absorption rate can reach 94%. The incident light with different polarized states has a small effect on the absorbency of the absorber, and the average absorbency of the absorber can still reach 90% at a large incident angle of ± 60 °. The wide absorption band of the absorber is due to the combination of slow-wave effect and local surface plasmon resonance.