Berlin 2012 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 36: Superconductivity: Cryodetectors
TT 36.5: Vortrag
Donnerstag, 29. März 2012, 10:30–10:45, H 2053
Hot Spots and THz waves in single crystal Bi2Sr2CaCu2O8 mesas — •Boris Gross1, Stefan Guenon1, Matthias Gruenzweig1, Jie Yuan2, Mengyue Li3, Zenguo Jiang3, Yangyin Zhong3, Akira Iishi2, Peiheng Wu3, Takeshi Hatano2, Roman Mints4, Dieter Koelle1, Huabing Wang2, and Reinhold Kleiner1 — 1PIT II, Universität Tübingen, Germany — 2National Institute for Materials Science, Tsukuba, Japan — 3Research Institute of Superconductor Electronics, Nanjing University, China — 4Faculty of Exact Science, Tel Aviv University, Ramat Aviv, Israel
Josephson Junctions offer a natural way to convert a dc voltage into high-frequency electromagnetic (e.m.) radiation. Intrinsic Josephson junctions (IJJs) in Bi2Sr2CaCu2O8 (BSCCO) are very promising candidates to be used as devices in the THz regime, allowing frequencies up to 10 THz. Stacks of many hundred IJJs can be fabricated easily. Research on BSCCO THz generators stagnated in the past due to perhaps modest success in creating operating devices. In 2007 Ozyuzer et al. detected coherent radiation up to 0.85 THz from large, rectangular mesa structures on BSCCO single crystals, reviving the research in this field. More than 500 junctions in the stack oscillated in phase, leading to a power of up to 0.5 µW. The mesas are believed to work as a cavity for electromagnetic standing waves, synchronizing the junctions in the stack. We report on the investigation of heat distribution, e.m. standing waves and THz e.m. wave generation in BSCCO mesas, using a combination of transport measurements, direct e.m. wave detection and Low Temperature Scanning Laser Microscopy.