Department of Electrical and Electronic Engineering, University of Glasgow, Glasgow, UK.
Opt Lett. 2011 Mar 15;36(6):945-7. doi: 10.1364/OL.36.000945.
Metamaterial absorbers have attracted considerable attention for applications in the terahertz range. In this Letter, we report the design, fabrication, and characterization of a terahertz dual band metamaterial absorber that shows two distinct absorption peaks with high absorption. By manipulating the periodic patterned structures as well as the dielectric layer thickness of the metal-dielectric-metal structure, significantly high absorption can be obtained at specific resonance frequencies. Finite-difference time-domain modeling is used to design the structure of the absorber. The fabricated devices have been characterized using a Fourier transform IR spectrometer. The experimental results show two distinct absorption peaks at 2.7 and 5.2 THz, which are in good agreement with the simulation. The absorption magnitudes at 2.7 and 5.2 THz are 0.68 and 0.74, respectively.
超材料吸收体在太赫兹波段的应用引起了相当大的关注。在这封信中，我们报告了太赫兹双频超材料吸收体的设计、制作和特性，该吸收体显示出两个具有高吸收率的明显吸收峰。通过操纵周期性图案结构以及金属-电介质-金属结构的介电层厚度，可以在特定的共振频率下获得显著的高吸收率。使用时域有限差分法对吸收体的结构进行了设计。使用傅里叶变换红外光谱仪对所制作的器件进行了特性表征。实验结果表明，在 2.7 和 5.2 THz 处有两个明显的吸收峰，与模拟结果吻合良好。在 2.7 和 5.2 THz 处的吸收率分别为 0.68 和 0.74。
