Abstract-Investigating flexible band-stop metamaterial filter over THz

Yuhua Yang, Yongqing Xu, Binzhen Zhang, Junping Duan, Li Yan, Hongcheng Xu, Yunpeng Liu, Yanan Shi,


https://www.sciencedirect.com/science/article/abs/pii/S003040181930029X

Metamaterial filter is a novel type of photoelectric device. In this study, a triple-band band-stop filter for terahertz is fabricated by magnetron sputtering of periodic metamaterial resonators on flexible polyimide substrates. The band-stop resonant points of the filter are 107.3, 167.45, and 209.9 GHz, and the 3 dB bandwidths are 14.13, 14.03, and 22.44 GHz. S21 parameters at the resonance point reach $-$30.217, $-$30.432, and $-$38.618 dB, thereby possibly achieving an excellent frequency blocking performance. Simultaneously, the stop-band can be adjusted by controlling the length of the metamaterial unit size, thus modifying the frequency of the filter.

Abstract-Nonlinear high-temperature superconducting terahertz metamaterials

Nathaniel K Grady¹, Bradford G Perkins Jr^2,3, Harold Y Hwang², Nathaniel C Brandt², Darius Torchinsky², Ranjan Singh¹, Li Yan¹, Daniel Trugman¹, Stuart A Trugman¹, Q X Jia¹, Antoinette J Taylor¹, Keith A Nelson² and Hou-Tong Chen^1,4

http://iopscience.iop.org/1367-2630/15/10/105016

We report the observation of a nonlinear terahertz response of split-ring resonator arrays made of high-temperature superconducting films. Intensity-dependent transmission measurements indicate that the resonance strength decreases dramatically (i.e. transient bleaching) and the resonance frequency shifts as the intensity is increased. Pump–probe measurements confirm this behaviour and reveal dynamics on the few-picosecond timescale.