Abstract:
This paper describes the development and experimental study of an original superconducting microwave (MW) throughput signal detector based on RFTES technology, designed for measuring ultra-weak signals in the microwave frequency range from 1 to 40 GHz and potentially beyond. The device utilizes thin-film superconducting microbridges operating near their critical temperature, enabling high sensitivity to throughput signal power at levels of the order of 10$^{-13}$ W and an insertion loss of less than -30 dB. The detector is implemented as a planar integrated structure, making it suitable for cryogenic applications, including integration into superconducting quantum devices such as qubits, parametric amplifiers, and frequency mixers. Key advantages of the detector include its broad operational frequency range and compatibility with complex superconducting circuits. The paper presents details on the device's structure, fabrication parameters, and preliminary results of the experimental study of the detector based on niobium and hafnium thin films. The comparison of simulated and measured S-parameters of experimental samples at frequencies of most interest around 1.5 and 7 GHz, at temperatures around 100 mK, are provided.
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