Wide-Range Bolometer with RF Readout TES
S.V. Shitov, N. N. Abramov, A. A. Kuzmin, M. Merker, M. Arndt, S. H., Wuensch, K. S. Ilin, E. Erhan, A. Ustinov, M. Siegel

TL;DR
This paper introduces a novel wide-range bolometer with RF readout based on a microbridge TES embedded in a high-Q resonator, demonstrating improved scalability and noise filtering for THz detection.
Contribution
The work presents a new thin-film detector design integrating a microbridge TES into a GHz resonator, enabling RF readout without SQUIDs and achieving high power conversion gain.
Findings
Achieved power-to-power gain above 10.
Demonstrated optical sensitivity of ~3×10⁻¹⁴ W/√Hz at 600-700 GHz.
Operated devices at about 5 K with RF characterization at 5.8 GHz.
Abstract
To improve both scalability and noise-filtering capability of a Transition-Edge Sensor (TES), a new concept of a thin-film detector is suggested, which is based on embedding a microbridge TES into a high-Q planar GHz range resonator weakly coupled to a 50 Ohm-readout transmission line. Such a TES element is designed as a hot-electron microbolometer coupled to a THz range antenna and as a load of the resonator at the same time. A weak THz signal coupled to the antenna heats the microbridge TES, thus reducing the quality factor of the resonator and leading to a power increment in the readout line. The power-to-power conversion gain, an essential figure of merit, is estimated to be above 10. To demonstrate the basic concept, we fabricated and tested a few submicron sized devices from Nb thin films for operation temperature about 5 K. The dc and rf characterization of the new device is made…
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