期刊
APPLIED PHYSICS LETTERS
卷 99, 期 16, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.3653242
关键词
damping; metamaterials; niobium compounds; self-induced transparency; superconducting thin films; type II superconductors
资金
- MOST of China [2011CBA00107, 2007CB310404]
- National Natural Science Foundation [61071009, 61027008]
- Fundamental Research Funds for the Central Universities [021014360004]
- Specialized Research Fund for Doctoral Program of Higher Education [20090091110040]
We designed and fabricated planar terahertz (THz) metamaterials made from superconducting NbN films to mimic electromagnetically induced transparency (EIT) system. They are characterized using THz time domain spectroscopy over a temperature range from 8 to 300 K. High transmittance and large delay-bandwidth product at transparency window are demonstrated, which mainly arise from the enhanced coupling and decreased damping in superconducting state. The EIT-like spectral response could be tuned in a wide frequency range. By applying two dark resonators with different resonance frequencies coupled with a radiative resonator, we experimentally demonstrated the planar metamaterials mimicking four-level EIT system. (C) 2011 American Institute of Physics. [doi: 10.1063/1.3653242]
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