Design of Narrow Discrete Distances of Dual-/Triple-Band Terahertz Metamaterial Absorbers

Nanoscale Research Letters
Ben-Xin WangTao Chen

Abstract

Various kinds of structure designs have been proposed to achieve the multiple-band metamaterial absorbers. However, the discrete distance of adjacent frequencies of multiple absorbers is considerably large, which will inevitably overlook a large amount of information hidden in the off-resonance absorption areas. Herein, a narrow discrete distance of dual-band terahertz absorber based on two pairs of an Au strip/dielectric layer backed by Au film is designed. Two nearly 100% absorptivities of resonance peaks having the discrete distance of only 0.30 THz are realized. The relative discrete distance of the device is 13.33%, and this value can be adjusted via the length change of an Au strip. Furthermore, we present two narrow discrete distances of a triple-band absorber through stacking one more pair of an Au strip and dielectric layer. Results prove that two discrete distances of only 0.14 THz and 0.17 THz in adjacent absorption modes of the first two and the last two are achieved, respectively; the relative discrete distances of them are respectively 6.57% and 7.22%, which are far from previous reports. Narrow discrete distances (or low values of relative discrete distance) of the multiple-band absorbers have a large number of a...Continue Reading

References

Jun 4, 2008·Physical Review Letters·N I LandyW J Padilla
Mar 16, 2011·Optics Letters·Yong MaDavid R S Cumming
Jun 7, 2011·Optics Express·Xiaopeng ShenHui Li
Feb 3, 2012·Optics Letters·Joshua HendricksonRichard Soref
May 26, 2012·Advanced Materials·Claire M WattsWillie J Padilla
Feb 3, 2016·Optics Express·Gang YaoJianquan Yao
Sep 9, 2016·Optics Express·Xiaoming LiuJi Zhou
Jan 14, 2017·Optics Express·Xinyu LiuWillie J Padilla
Apr 4, 2018·Optics Express·Zhengyong SongQing Huo Liu

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