Department of Electrical and Computer Engineering, Texas Tech University, Lubbock, Texas 79409, USA.
Opt Lett. 2012 Feb 1;37(3):296-8. doi: 10.1364/OL.37.000296.
Bandpass filters are reported based on double-stacked metamaterial layers separated by an air gap for operation at terahertz frequencies. Several stacking configurations were investigated designed for a ~0.5 THz center frequency. The filters exhibited improved spectral transmission properties when compared with conventional ones based on single metamaterial layers. 3 dB bandwidth of ~78 GHz and sidelobe suppression ratio >16 dB were determined when symmetric or asymmetric double layers were stacked. We demonstrate that superior frequency selectivity can be achieved when metamaterial layers with different unit cells are used. Good agreement was found between measured and simulated transmission response.
基于双堆叠超材料层的带通滤波器，通过气隙实现太赫兹频率工作。研究了几种堆叠配置，设计用于中心频率约为 0.5 THz。与基于单层超材料的传统滤波器相比，该滤波器显示出了改进的光谱传输特性。当对称或非对称双层堆叠时，确定了约 78 GHz 的 3 dB 带宽和> 16 dB 的旁瓣抑制比。我们证明了使用不同单元的超材料层可以实现更好的频率选择性。测量和模拟的传输响应之间存在良好的一致性。
