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To evaluate terahertz emission from intrinsic Josephson junctions, we used a YBa2Cu3O7−δ (YBCO) grain boundary Josephson junction as a terahertz detector. Shapiro steps have been clearly seen on the current-voltage curves of the YBCO junction irradiated with the emission from either a VDI-Tx-S140 transmitter (tens of μW at 620 GHz) or a Bi2Sr2CaCu2O8−x stack (25 μW at 500 GHz). While the harmonic...
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...
Using a double-sided fabrication method, we fabricated Bi2Sr2CaCu2O8 (BSCCO) intrinsic Josephson junctions (IJJs) with a gold-BSCCO-gold structure. Coherent emission is observed at large dc input power, where a hot spot and “cold” part of the stack, coexist. The power, directly detected with a bolometer, is as high as 25 µW, implying the integrated power should be already in the order of sub-mW. We...
To evaluate terahertz emission from intrinsic Josephson junctions, we use a YBa2Cu3O7 grain boundary Josephson junction as a detector. Shapiro steps on the current-voltage characteristics of the detector were clearly observed and their positions moved with the bias voltage of the emitter accordingly. Analyzing the current-voltage characteristics of the detector, we found that the emission was tuned...
Rectangular Bi2Sr2CaCu2O8+δ (Bi2212) mesa structures were fabricated on as-grown Bi2212 single crystal superconductors using standard photolithography and Ar ion beam etching techniques. We have performed c-axis resistance versus temperature (R-T), current-voltage (I-V) characteristics and bolometer measurements. Furthermore, in contrast to previous studies, the emission frequency was determined using...
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