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TT: Fachverband Tiefe Temperaturen
TT 31: SC: Tunnelling, Josephson Junctions
TT 31.3: Vortrag
Donnerstag, 25. März 2010, 10:00–10:15, H21
Terahertz emission from intrinsic Josephson junction stacks in high-Tc superconductors: effects of fabrication technique — •Y. Simsek1, L. Özyüzer1,2, S. Preu3, D. Ploss3, S. Malzer3, Y. Koval1, H. B. Wang4, and P. Müller1 — 1Department of Physics and Interdisciplinary Center for Molecular Materials (ICMM), Universität Erlangen-Nürnberg, Germany — 2Department of Physics, Izmir Institute of Technology, Izmir, Turkey — 3Max Planck Institute for the Science of Light, Erlangen, Germany — 4National Institute for Materials Science (NIMS), Tsukuba, Japan
It was found recently that large area Bi2Sr2CaCu2O8+δ (Bi2212) mesas show terahertz emission due to intrinsic Josephson junctions (IJJ). We have fabricated large and tall Bi2212 mesas by optical and electron beam lithography, and studied effects of fabrication technique on THz emission characteristics. Monitoring the emission was performed with a Si composite bolometer, while the applied current through the IJJ stacks was slowly swept by a function generator. Emission peaks were observed on I-V return branches while the bias current was decreasing. The frequency of emission was determined by a terahertz interferometer. The observed emission frequencies match the frequency calculated by the cavity resonance condition.