Regensburg 2013 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 49: Superconductivity: SQUIDs & Cryodetectors
TT 49.4: Vortrag
Mittwoch, 13. März 2013, 17:45–18:00, H21
Experiments with Tunable Josephson Metamaterials — •Susanne Butz1, Philipp Jung1, Valery Koshelets2, and Alexey V. Ustinov1,3 — 1Physikalisches Institut , Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany — 2Kotel’nikov Institute of Radio Engineering and Electronics RAS, Moscow 125009, Russia — 3National University of Science and Technology MISIS, Moscow 119049, Russia
We will report on experiments investigating a tunable metamaterial consisting of rf-SQUIDs. A metamaterial is a medium constructed of artifical elements, so-called meta-atoms, that interact in a specific way with an incoming electromagnetic wave. The size of the individual meta-atom is much smaller than the wavelength. Our metamaterial consists of an array of rf-SQUIDs which is placed into a coplanar waveguide. The rf-SQUIDs couple to the magnetic field component of the propagating microwave. In a frequency range around the resonance frequency, the magnetic permeability µr of the metamaterial deviates strongly from the typical value of µr = 1. By using an additional constant magnetic field bias, the inductance of the Josephson junction and thereby the resonance frequency of our meta-atom is changed. We show that the magnetic permeability of such a SQUID metamaterial is tunable in situ and compare the experimental results with numerical simulations.