Subharmonic energy gap structure in the Josephson radiation at 35 GHz from a superconducting thin-film microbridge

Abstract
Nonresonant detection of the Josephson radiation 35 GHz from a superconducting thin‐film microbridge is reported. The high frequency and the accuracy of these measurements lead to a new important observation: subharmonic energy gap structure in the detected integral power. The maximum integral power measured was as large as 8×10−11 W.