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TT: Fachverband Tiefe Temperaturen

TT 57: Poster: Superconductivity I

TT 57.22: Poster

Thursday, March 30, 2023, 15:00–18:00, P2/OG2

Realization of He-FIB induced Josephson junction THz detectors in YBCO thin films — •Kenny Fohmann, Christoph Schmid, Eric Dorsch, Edward Goldobin, Dieter Koelle, and Reinhold Kleiner — Physikalisches Institut, Center for Quantum Science (CQ) and LISA+, Universität Tübingen, Germany

We designed and fabricated ultrawideband thin-film antennas from the high-temperature superconductor YBa2Cu3O7−δ (YBCO) partially covered with Au. By using a focused He ion beam (He-FIB) we “draw” a Josephson Junction (JJ) [1] into the microbridge footpoint of the spiral antenna. Under microwave irradiation the JJ exhibits Shapiro steps in the IV characteristic.

We report on design optimization. This includes improved matching of the impedances of the antenna and the JJ in an ultrawide frequency band by using a logarithmic periodic antenna. Moreover, we performed simulations using CST Studio-Suite to improve the coupling of a plane-wave signal to the antenna.

To characterize the antennas, we compare the excitation of the JJ embedded in a simple linear YBCO bridge (∼ 1 mm) with the one embedded in the footpoint of the antenna, for frequencies up to 40 GHz. The ultimate goal of such an antenna with a YBCO JJ is to detect the radiation from a BSCCO-mesa (placed on another chip nearby) in the frequency range 0.5 THz. The latest measurements will be presented.
[1] B. Müller et al., Phys. Rev. Appl. 11, 044082 (2019)

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