High quality factor, fully switchable terahertz superconducting metasurface

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...

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Bibliographic Details
Published in:	Applied physics letters Vol. 105; no. 26
Main Authors:	Scalari, G., Maissen, C., Cibella, S., Leoni, R., Faist, J.
Format:	Journal Article
Language:	English
Published:	Melville American Institute of Physics 29-12-2014
Subjects:	Applied physics ASPECT RATIO Comparative analysis COMPARATIVE EVALUATIONS COMPUTERIZED SIMULATION CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY COOPER PAIRS COUPLING CRITICAL TEMPERATURE FINITE ELEMENT METHOD High aspect ratio INDUCTANCE Metasurfaces NIOBIUM Q factors QUALITY FACTOR SUPERCONDUCTORS THIN FILMS THREE-DIMENSIONAL CALCULATIONS THREE-DIMENSIONAL LATTICES THZ RANGE
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Summary:	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.
ISSN:	0003-6951 1077-3118
DOI:	10.1063/1.4905199