期刊
APPLIED PHYSICS LETTERS
卷 105, 期 26, 页码 -出版社
AMER INST PHYSICS
DOI: 10.1063/1.4905199
关键词
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资金
- Swiss National Science Foundation (SNF) through the National Centre of Competence in Research Quantum Science and Technology
- Swiss National Science Foundation (SNF) through the SNF Grant [129823]
- ERC grant MUSiC
We present a complementary THz metasurface realised with Niobium thin film which displays a quality factor Q = 54 and a fully switchable behaviour as a function of the temperature. The switching behaviour and the high quality factor are due to a careful design of the metasurface aimed at maximising the ohmic losses when the Nb is above the critical temperature and minimising the radiative coupling. The superconductor allows the operation of the cavity with high Q and the use of inductive elements with a high aspect ratio. Comparison with three dimensional finite element simulations highlights the crucial role of the inductive elements and of the kinetic inductance of the Cooper pairs in achieving the high quality factor and the high field enhancement. (C) 2014 AIP Publishing LLC.
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