Jiangsu Provincial Research Center of Light Industrial Optoelectronic Engineering and Technology, School of Science, Jiangnan University, Wuxi 214122, China.
Library and Information Center, Hunan Traditional Chinese Medical College, Zhuzhou 412012, China.
Sci Rep. 2017 Jan 25;7:41373. doi: 10.1038/srep41373.
This paper reports on a numerical study of the six-band metamaterial absorber composed of two alternating stack of metallic-dielectric layers on top of a continuous metallic plane. Six obvious resonance peaks with high absorption performance (average larger than 99.37%) are realized. The first, third, fifth, and the second, fourth, sixth resonance absorption bands are attributed to the multiple-order responses (i.e., the 1-, 3- and 5-order responses) of the bottom- and top-layer of the structure, respectively, and thus the absorption mechanism of six-band absorber is due to the combination of two sets of the multiple-order resonances of these two layers. Besides, the size changes of the metallic layers have the ability to tune the frequencies of the six-band absorber. Employing the results, we also present a six-band polarization tunable absorber through varying the sizes of the structure in two orthogonal polarization directions. Moreover, nine-band terahertz absorber can be achieved by using a three-layer stacked structure. Simulation results indicate that the absorber possesses nine distinct resonance bands, and average absorptivities of them are larger than 94.03%. The six-band or nine-band absorbers obtained here have potential applications in many optoelectronic and engineering technology areas.
本文报道了一种由两层交替的金属-介质层和一个连续金属平面组成的六频带超材料吸波器的数值研究。实现了六个明显的共振峰，具有高吸收性能（平均大于 99.37%）。第一、第三、第五和第二、第四、第六共振吸收带分别归因于结构底层和顶层的多阶响应（即 1 阶、3 阶和 5 阶响应），因此六频带吸收器的吸收机制是由这两层的两组多阶共振组合而成。此外，金属层的尺寸变化具有调节六频带吸收器频率的能力。利用这些结果，我们还通过改变两个正交偏振方向的结构尺寸，展示了一个六频带偏振可调吸收器。此外，通过使用三层堆叠结构可以实现九频带太赫兹吸收器。模拟结果表明，该吸收器具有九个明显的共振带，它们的平均吸收率大于 94.03%。这里得到的六频带或九频带吸收器在许多光电和工程技术领域具有潜在的应用。
