摘要
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 equivalent circuit of nanodipole, combine the multi-layer waveguide and resonator structure, a nano-metamaterial solar absorber with high absorptivity and broadband is designed. The unit structure of the absorber is composed of a double hexagonal metamaterial nanocolumnar and a silicon ring, in which the silicon ring is fitted with eight miniature Au nanocolumns. The finite difference time domain method is used to analyze the absorption characteristics of the metamaterial solar absorber in broadband, different-polarized incident light and large- angle incident light. The numerical analysis shows that the absorption band of the absorber is mainly concentrated at 400-1500 nm, and the average absorption rate can reach 94%. The incident light of different polarization states has little effect on the absorptivity of the absorber and the average absorptivity of the absorber can reach 90% at a big incidence angle of ±60°. The high absorptivity of the broadband of the absorber is attributed to the synergetic effect of the slow-wave effect and localized surface plasmon resonance.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2017年第9期264-273,共10页
Acta Optica Sinica
基金
国家自然科学基金(31101081
61162015)
江西省自然科学基金(20161BAB202061)
江西省科技支撑项目(20151BBE50095)
关键词
光学器件
超材料
吸收器
宽波段
吸收率
optical devices
metamaterial
absorber
broadband
absorptivity
