Towards the development of an active terahertz RFTES detector

The model of the active superconducting terahertz detector comprising the RFTES (Radio Frequency Transition Edge Sensor) bolometer and the parametric microwave amplifier based on the DC SQUID is analyzed. Electromagnetic modeling of the structure employing a quarter-wave resonator at a frequency of 1.5 GHz demonstrated the possibility of matching the losses introduced by the resistive bridge of the terahertz antenna and the resistive emulator of the SQUID. The numerical calculation of the DC SQUID was performed using the RCSJ model accounting for nonlinear quasiparticle conductivity and a high-resistance shunt. The Josephson junctions are planned to be manufactured using the shadow sputtering technology Al/AlO$_x$/Al. The electrophysical parameters of the junction and the shunt, which are necessary for obtaining a hysteresis-free current-voltage characteristic of the DC SQUID and implementing a gain of $\sim$10 dB, have been estimated.