A flexible wideband bandpass terahertz filter using multi-layer metamaterials

作者：Liang Lanju; Jin Biaobing^*; Wu Jingbo; Huang Yi; Ye Zhihui; Huang Xiaoming; Zhou Dong; Wang Guosheng; Jia Xiaoqing; Lu Hai; Kang Lin; Xu Weiwei; Chen Jian; Wu Peiheng

来源：Applied Physics B: Lasers and Optics , 2013, 113(2): 285-290.

DOI：10.1007/s00340-013-5470-x

We make a flexible wideband bandpass filter at terahertz (THz) frequencies using multi-layer metamaterials. A very flat response in the passband can be obtained since the Fabry-Perot reflection inside the rigid substrate is eliminated. The center frequency is about 0.89 THz with a 3 dB bandwidth of 0.69 THz for normal incidence. The sharp band-edge transitions are 53 and 70 dB/THz to the rejection bands, respectively. The measured average insertion loss is 1.4 dB with a ripple of 0.8 dB. Furthermore, the transmission feature is insensitive to the polarization of incident wave due to the symmetric structure of the unit cell of the metamaterials. Also, it has a small change as the increase of the curvature of the flexible substrate. This result manifests that the multi-layer metamaterials can provide an effective way to design wideband THz devices.

• 出版日期2013-11
• 单位南京大学