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Title: 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 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.
Authors:
; ;  [1] ; ;  [2]
  1. Institute of Quantum Electronics, Eidgenössische Technische Hochschule Zürich (Switzerland)
  2. Istituto di Fotonica e Nanotecnologie (IFN), CNR, via Cineto Romano 42, 00156 Rome (Italy)
Publication Date:
OSTI Identifier:
22395599
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 26; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ASPECT RATIO; COMPARATIVE EVALUATIONS; COMPUTERIZED SIMULATION; COOPER PAIRS; COUPLING; CRITICAL TEMPERATURE; FINITE ELEMENT METHOD; INDUCTANCE; NIOBIUM; QUALITY FACTOR; SUPERCONDUCTORS; THIN FILMS; THREE-DIMENSIONAL CALCULATIONS; THREE-DIMENSIONAL LATTICES; THZ RANGE