TY - JOUR
A1 - Galin, Mikhail A.
A1 - Krasnov, Vladimir M.
A1 - Shereshevsky, Ilya A.
A1 - Vdovicheva, Nadezhda K.
A1 - Kurin, Vladislav V.
T1 - Coherent amplification of radiation from two phase-locked Josephson junction arrays
JF - Beilstein Journal of Nanotechnology
PY - 2022///
VL - 13
SP - 1445
EP - 1457
SN - 2190-4286
DO - 10.3762/bjnano.13.119
PB - Beilstein-Institut
JA - Beilstein J. Nanotechnol.
UR - https://doi.org/10.3762/bjnano.13.119
KW - coherent radiation
KW - Josephson junction arrays
KW - numerical modelling
KW - single-strip line
KW - synchronization
N2 - We analyze experimentally and theoretically mutual phase locking and electromagnetic interaction between two linear arrays with a large number of Josephson junctions. Arrays with different separation, either on the same chip or on two separate substrates are studied. We observe a large coherent gain, up to a factor of three, of emitted power from two simultaneously biased arrays, compared to the sum of powers from two individually biased arrays. The phenomenon is attributed to the phase locking of junctions in different arrays via a common electromagnetic field. Remarkably, the gain can exceed the factor of two expected for a simple constructive interference of two oscillators. The larger gain is explained by an additional consequence of mutual interaction between two large arrays. Mutual phase locking of large arrays does not only result in constructive interference outside the arrays, but also improved synchronization of junctions inside each array. Our conclusion is supported by numerical modelling.
ER -