Journal
ACTA PHYSICA SINICA
Volume 61, Issue 15, Pages -Publisher
CHINESE PHYSICAL SOC
DOI: 10.7498/aps.61.154101
Keywords
metamaterials; trapped mode; Fano resonance; electromagnetically-induced transparency
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Funding
- Young Scientists Fund of the National Natural Science Foundation of China [11104043]
- Natural Science Foundation of Heilongjiang Province, China [LC201006]
- Fundamental Research Funds for the Central Universities [HEUCF20111113]
- China Postdoctoral Science Foundation [2012M511651]
- Special Foundation for HarbinYoung Scientists [2012RFLXG030]
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We demonstrate the tuning of Fano resonances in a symmetric planar metamaterial both experimentally and theoretically, on the basis of a unit cell consisting of two identical split ring resonators. The electromagnetic responses of the planar metamaterial to incident TE and TM waves are measured. By controlling the excitation of the Fano-type trapped-mode resonance via the angle of incidence, the resonance can be switched on/off and the resonance is red-shifted by up to 21%. Based on the finite element method, the field distributions are presented and a very sharp normal phase dispersion renders the response of the structure a metamaterial analog of classical electromagnetically-induced transparency (EIT). The simulated results are in good agreement with the measured ones. The switching feature of the trapped mode resonance in symmetric metamaterial can provide an easy approach to tuning the performance of metamaterial.
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