S. Kohjiro et al., MODULATION OF SELF-RESONANT MODES IN NBCN MGO/NBCN JUNCTIONS LAY BY QUASI-PARTICLE INJECTION/, IEEE transactions on applied superconductivity, 5(2), 1995, pp. 2224-2227
In submillimeter wave region, we have studied the modulation of self-r
esonant modes in NbCN/MgO/NbCN Josephson junctions (detectors). The tu
ning mechanism is based on the quasiparticle injection via an overlaid
funnel junction (injector). From the current-voltage characteristics
of detectors, the maximum shift of resonant frequencies Delta f and Q
factors due to electrode loss at the injected state Q(inj) have been e
stimated to be Delta f/f(0)=0.01 and Q(inj)=100 at 470GHz, where f(0)
is the resonant frequency without quasiparticle injection. It is found
Q(inj) decreases with increase of the injector bias voltage.