Abstract
Slot antenna-coupled high-Tc YBa2Cu3O7-δ(YBCO) microbridges were fabricated and their millimeter-wave detection properties in the resistive state were investigated at 94 GHz. The nonbolometric response due to vortex motion was observed in the vicinity of the critical temperature. It became dominant in the extended temperature region when the bias current was increased. The detected voltages were almost proportional to the vortex velocity in the microbridge and the maximum voltage was detected when the vortex velocity was at its maximum. We have shown that the nonbolometric response is obtained by enhancement of the vortex motion due to the high frequency current induced by the slot antenna. Keeping the bias current constant, the detected voltages were almost proportional to the input power, and a responsivity of approximately 180 V/W was obtained.
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