Journal
SCIENTIFIC REPORTS
Volume 5, Issue -, Pages -Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/srep15588
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Funding
- National Basic Research Program of China [2014CB339800, 2011CBA00107, 2013CB328701]
- National Instrumentation Program [2012YQ14005]
- National High-Tech R&D Program of China [2011AA010204]
- National Natural Science Foundation [61071009, 61322508, 11227904]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Jiangsu Provincial Key Laboratory of Advanced Manipulating Technique of Electromagnetic Wave
- Cooperative Innovation Centre of Terahertz Science, University of Electronic Science and Technology, Chengdu, China
- Grants-in-Aid for Scientific Research [25289108] Funding Source: KAKEN
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Superconductor is a compelling plasmonic medium at terahertz frequencies owing to its intrinsic low Ohmic loss and good tuning property. However, the microscopic physics of the interaction between terahertz wave and superconducting plasmonic structures is still unknown. In this paper, we conducted experiments of the enhanced terahertz transmission through a series of superconducting NbN subwavelength hole arrays, and employed microscopic hybrid wave model in theoretical analysis of the role of hybrid waves in the enhanced transmission. The theoretical calculation provided a good match of experimental data. In particular, we obtained the following results. When the width of the holes is far below wavelength, the enhanced transmission is mainly caused by localized resonance around individual holes. On the contrary, when the holes are large, hybrid waves scattered by the array of holes dominate the extraordinary transmission. The surface plasmon polaritions are proved to be launched on the surface of superconducting film and the excitation efficiency increases when the temperature approaches critical temperature and the working frequency goes near energy gap frequency. This work will enrich our knowledge on the microscopic physics of extraordinary optical transmission at terahertz frequencies and contribute to developing terahertz plasmonic devices.
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