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In recent years coherent terahertz (THz) radiation from stacks containing nearly 1000 Bi2Sr2CaCu2O8 (BSCCO) intrinsic Josephson junctions (IJJs) has attracted a lot of research interest. However, in most cases, reported have been frequencies well below 1 THz, or typically around 500 GHz, which obviously can be a bottleneck for many applications. In our experiments, by optimizing sample structures...
We report on THz emission measurements and low temperature scanning laser imaging of Bi2Sr2CaCu2O8 intrinsic Josephson junction stacks. Coherent emission is observed at large dc input power, where a hot spot and a standing wave, formed in the “cold” part of the stack, coexist. By changing bias current and bath temperature the emission frequency can be varied over a wide range of 350–780 GHz; the variation...
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