Journal
OPTICS EXPRESS
Volume 19, Issue 13, Pages 12021-12026Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.19.012021
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Funding
- MOST [2007CB310404, 2011CBA00107]
- National Natural Science Foundation [61071009]
- Program for New Century Excellent Talents in University [NCET-07-0414]
- Fundamental Research Funds for the Central Universities [021014360004]
- Specialized Research Fund for Doctoral Program of Higher Education [20090091110040]
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Superconducting planar terahertz (THz) metamaterials (MMs), with unit cells of different sizes, are fabricated on 200 nm-thick niobium nitride (NbN) films deposited on MgO substrates. They are characterized using THz time domain spectroscopy over a temperature range from 8.1 K to 300 K, crossing the critical temperature of NbN films. As the gap frequency (f(g) = 2 Delta(0)/h, where Delta(0) is the energy gap at 0 K and h is the Plank constant) of NbN is 1.18 THz, the experimentally observed THz spectra span a frequency range from below f(g) to above it. We have found that, as the resonance frequency approaches f(g), the relative tuning range of MMs is quite wide (30%). We attribute this observation to the large change of kinetic inductance of superconducting film. (C) 2011 Optical Society of America
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