Engineering electromagnetic responses of bilayered metamaterials based on Fano resonances

• Published in: Applied physics letters Vol. 103; no. 7
• Main Authors: Shi, Jinhui, Liu, Ran, Xu, Yiqun, Zhu, Zheng, Wang, Yuekun, Ma, Huifeng, Cui, Tiejun
• Format: Journal Article
• Language: English
• Published: 12-08-2013
• ISSN: 0003-6951; 1077-3118
• DOI: 10.1063/1.4818817

We numerically and experimentally demonstrate engineered electromagnetic responses from a single-peak Fano resonance to a fast roll-off behavior by using planar metamaterials, which are constructed by bilayered asymmetrically split rings (ASRs) with twist angles of 0° and 180°. Since each single-layer ASR metamaterial reveals a Fano-type resonance, the dramatic transmission properties are resulted from the hybridization of electromagnetic resonances due to the near-field coupling between two Fano resonances and the far-field retardation effect of the bilayered metamaterials. The surface currents and charges distributions provide an insight into deep understanding of in-phase and out-of-phase coupling of two Fano resonances. The measured and simulated results of bilayered metamaterials agree well to each other. Especially, the proposed metamaterials can be exploited to design metamaterial-based devices in the THz and optical ranges like filters and sensors.