Journal
APPLIED PHYSICS LETTERS
Volume 103, Issue 7, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4818817
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Funding
- National Science Foundation of China [61201083, 61275094, U1231201, 61171024, 61171026, 60990320, 60990324]
- Natural Science Foundation of Heilongjiang Province in China [LC201006]
- China Postdoctoral Science Foundation [2012M511171, 2013T60487]
- Special Foundation for Harbin Young Scientists [2012RFLXG030]
- Fundamental Research Funds for the Central Universities
- 111 Project [B13015, 111-2-05]
- National High Tech (863) Projects [2011AA010202, 2012AA030402]
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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 degrees and 180 degrees. 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. (C) 2013 AIP Publishing LLC.
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