Title :
A grain boundary Josephson junction as a mixer to evaluate terahertz emission from intrinsic Josephson junctions
Author :
An, D.Y. ; Ji, Mingming ; Zhou, X.J. ; Huang, Yi-Pai ; Yu, Min-Chieh ; Zhang, M.Y. ; Hatano, Tomomi ; Kinev, N. ; Koshelets, V.P. ; Koelle, D. ; Kleiner, R. ; Chen, Jiann-Jong ; Xu, W.W. ; Wang, H.B. ; Wu, P.H.
Author_Institution :
Res. Inst. of Supercond. Electron., Nanjing Univ., Nanjing, China
Abstract :
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 mixing has been successfully performed with the VDI transmitter as the signal source, the evaluation of the intrinsic Josephson junctions is still undergoing.
Keywords :
barium compounds; copper compounds; grain boundaries; superconducting junction devices; superconducting mixers; terahertz wave detectors; yttrium compounds; Shapiro steps; VDI-Tx-S140 transmitter; YBCO grain boundary Josephson junction; YBa2Cu3O7-δ; current-voltage curves; frequency 500 GHz; frequency 620 GHz; harmonic mixing; intrinsic Josephson junctions; mixer; signal source; terahertz detector; terahertz emission evaluation; Bismuth compounds; Detectors; Grain boundaries; Josephson junctions; Junctions; Transmitters; Yttrium barium copper oxide;
Conference_Titel :
Infrared, Millimeter, and Terahertz waves (IRMMW-THz), 2014 39th International Conference on
Conference_Location :
Tucson, AZ
DOI :
10.1109/IRMMW-THz.2014.6956529
