Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 46: Superconductivity: Tunnelling, Josephson Junctions, SQUIDs 2
TT 46.7: Vortrag
Donnerstag, 29. März 2012, 19:30–19:45, H 2053
Experiments with SQUID-based Metamaterials — •Susanne Butz1, Philipp Jung1, Sergey V. Shitov2, 3, and Alexey V. Ustinov1, 3 — 1Physikalisches Institut, Karlsruher Institut für Technologie, 76131 Karlsruhe, Germany — 2Institute of Radio Engenieering and Electronics (IREE RAS), Moscow 125009, Russia — 3National University of Science and Technology MISIS, Moscow 119049, Russia
Metamaterials consist of elements that are artifically created to obtain a specific, predetermined interaction with an electromagnetic wave. The size of individual elements is much smaller than the wavelength of the incoming radiation. Conventionally, split ring resonators are used to interact with the magnetic field component of the wave. The interaction with the electric component is realized by thin metallic wires. We designed a Josephson junction based metamaterial where the split ring resonators are replaced by rf-SQUIDs. The benefits compared to conventional metamaterials are that the losses are reduced and that the inductance of the Josephson junction can be tuned by an external magnetic field. This, in turn, changes the resonance frequency of the metamaterial, making the magnetic permeability, µr, tunable in situ. We will report on first experiments investigating such a SQUID metamaterial composed of a coplanar waveguide coupled to a one-dimensional array of rf-SQUIDs. The experimental results will be compared with numerical simulations.