Title :
Terahertz detector using a Nb-based superconducting tunnel junction
Author :
Otani, C. ; Hoshino, K. ; Taino, T. ; Myoren, H. ; Nakano, R. ; Ariyoshi, S. ; Sato, H. ; Shimizu, H.M. ; Takada, S. ; Kawase, K.
Author_Institution :
RIKEN, Inst. of Phys. & Chem. Res., Saitama, Japan
fDate :
27 Sept.-1 Oct. 2004
Abstract :
We have developed a terahertz (THz) radiation detector using a Nb-based superconducting tunnel junction (STJ). The STJ was fabricated on a stoichiometric LiNbO3 substrate. The incident THz photons absorbed by the substrate generate THz phonons, and a substantial amount of the phonons are detected by the STJ. The detector is expected to be sensitive to a wideband THz/far-infrared radiation above the energy gap of the Nb superconductor. We radiated monochromatic nanosecond THz pulses with the repetition rate of 49 Hz, and detected the corresponding periodic signals for the 1.1-1.9 THz radiation.
Keywords :
aluminium; aluminium compounds; energy gap; infrared detectors; niobium; phonons; stoichiometry; submillimetre wave detectors; superconducting energy gap; superconductive tunnelling; superconductor-insulator-superconductor devices; 1.1 to 1.9 THz; 49 Hz; LiNbO3; Nb based superconducting tunnel junction; Nb-Al-AlOx-Al-Nb; THz phonons; energy gap; far infrared radiation; monochromatic nanosecond THz pulses; stoichiometric LiNbO3 substrate; wideband THz radiation detector; wideband terahertz radiation detector; Aluminum; Biological materials; Biomedical materials; Fabrication; Frequency; Josephson junctions; Niobium; Phonons; Radiation detectors; Superconducting epitaxial layers;
Conference_Titel :
Infrared and Millimeter Waves, 2004 and 12th International Conference on Terahertz Electronics, 2004. Conference Digest of the 2004 Joint 29th International Conference on
Print_ISBN :
0-7803-8490-3
DOI :
10.1109/ICIMW.2004.1422045
