Title :
AC Josephson effect in superconducting niobium nitride tunnel junctions at up to 2.5 THz
Author :
Wicks, Michael ; Haycocks, P.R. ; Hori, Toshikazu
Author_Institution :
Div. of Electr. Sci., NPL, Teddington, UK
fDate :
4/26/1990 12:00:00 AM
Abstract :
Shapiro steps have been observed in the I-V characteristics of an NbN tunnel junction illuminated with radiation from an optically pumped far infrared laser. The maximum operating frequency which produced an observable Shapiro step was 2.53 THz. This is a four-fold increase over that previously reported for a thin film Josephson junction. Clear steps were also produced by various laser lines in the frequency range 0.6-1.8 THz.
Keywords :
Josephson effect; niobium compounds; 0.6 to 1.8 THz; 2.53 THz; AC Josephson effect; I-V characteristics; NbN tunnel junction; Shapiro steps; far infrared laser; maximum operating frequency;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19900401
