Imaging of local temperature distributions in mesas of high-Tc superconducting terahertz sources

27th International Conference on Low Temperature Physics

Tsujimoto, M.^1 ; Kambara, H.^1 ; Maeda, Y.^1 ; Yoshioka, Y.^1 ; Nakagawa, Y.^1 ; Kakeya, I.^1

Department of Electronic Science and Engineering, Kyoto University, Kyoto, Japan^1

关键词: Cavity resonances;    High Tc superconductors;    Intrinsic Josephson junction;    Local temperature;    Surface temperatures;    Temperature imaging;    Terahertz emissions;    Terahertz sources;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/568/2/022048/pdf
DOI  :  10.1088/1742-6596/568/2/022048

来源: IOP

【 摘 要 】

Stacks of intrinsic Josephson junctions in high-Tcsuperconductors are a promising source of intense, continuous, and monochromatic terahertz waves. In this paer, we establish a fluorescence-based temperature imaging system to directly image The surface temperature on a Bi2Sr2CaCu2O8+δmesa sample. Intense terahertz emissions are observed in both high- and low-bias regimes, where The mesa voltage satisfies The cavity resonance condition. In The high- bias regime, The temperature distributions are shown to be inhomogeneous with a considerable temperature rise. In contrast, in The low-bias regime, The distributions are rather uniform and The local temperature is close to The bath temperature over The entire sample.