Berlin 2024 – scientific programme
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TT: Fachverband Tiefe Temperaturen
TT 18: Superconductivity: Poster
TT 18.33: Poster
Monday, March 18, 2024, 15:00–18:00, Poster C
Antenna Structures for YBCO Josephson Junction Arrays — •Max Pröpper1, Dominik Hanisch1, Christoph Schmid2, Paul Julius Ritter1, Marius Neumann1, Julius Mumme1, Edward Goldobin2, Dieter Koelle2, Reinhold Kleiner2, Meinhard Schilling1, and Benedikt Hampel1 — 1Institut für Elektrische Messtechnik und Grundlagen der Elektrotechnik, Technische Universität Braunschweig, 38106 Braunschweig, Germany — 2Physikalisches Institut, Center for Quantum Science and LISA+, Universität Tübingen, Germany
High-temperature superconductors like yttrium barium copper oxide (YBCO) are promising candidates for a voltage standard working at liquid nitrogen temperatures. Their ability to function at THz frequencies is advantageous, as this significantly reduces the number of Josephson junctions (JJs) needed for an array with comparable voltage output. To achieve this, JJs with low parameter variation are necessary. A promising method for fabricating consistent JJs is the use of a helium focused ion beam (He-FIB). In this work, we present JJ arrays made from YBCO based on a direct writing He-FIB process. The arrays are positioned directly at the feed point of various antenna structures, aiming to optimize the coupling efficiency of radiation to the JJs. A DC characterization of the JJs was performed. Furthermore, the JJ arrays were irradiated with frequencies up to the THz regime using a far-infrared laser system. The I-V characteristics of the JJs are analyzed and resulting output voltages characterized. Finally, the results are compared to simulations performed with CST Studio.
Keywords: YBCO; Josephson junction; He-FIB; Antennas; THz