Journal
OPTICS EXPRESS
Volume 19, Issue 2, Pages 1101-1106Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.19.001101
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Funding
- MOST of China [2007CB310404, 2011CBA00107]
- National Natural Science Foundation [61071009, 61027008]
- Program for New Century Excellent Talents in University [NCET-07-0414]
- Specialized Research Fund for doctoral program of higher education [20090091110040]
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We report the extraordinary terahertz (THz) transmission through subwavelength hole array in superconducting NbN film. As the temperature drops below the superconducting transition temperature, the transmission spectra experience distinct changes. The extraordinary transmission is greatly enhanced in superconducting state due to the enhancement of surface plasmon polaritons (SPPs) and localized surface plasmons (LSPs). We have also observed temperature-dependent resonance frequency shift, which mainly depends on the coupling between SPPs and LSPs. (C) 2011 Optical Society of America
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