Dresden 2014 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 7: Superconductivity: Cryodetectors

TT 7.1: Talk

Monday, March 31, 2014, 09:45–10:00, HSZ 03

First demonstration of a TES with High-Frequency Readout at 0.65 THz — •Artem Kuzmin¹, Michael Merker¹, Sergey Shitov^2,3, Nikolay Abramov², Mathias Arndt¹, Stefan Wuensch¹, Konstantin Ilin¹, Alexey Ustinov^2,4, and Michael Siegel¹ — ¹Institut für Mikro- und Nanoelektronische Systeme, Karlsruher Institut für Technology — ²National University of Science and Technology MISIS — ³Kotel’nikov Institute of Radio Engineering and Electronics RAS — ⁴Institute of Physics and DFG-Center for Functional Nanostructures (CFN), Karlsruhe Institute of Technology

We suggested an antenna-coupled TES bolometer embedded in a high-Q GHz resonator as a load to isolate the sensitive element from excess noise and disturbances. The resonator is weakly coupled to the readout transmission line. This approach allows for biasing the TES with RF power at their individual resonance frequencies and readout incident THz signal as modulation of this RF biasing signal with "conversion gain" > 1, thus it is possible to use a single broadband low-noise HEMT amplifier for a relatively large number of TES bolometers in array. This approach could be used down to 300 mK without a SQUID amplifier [1-2]. To proof the concept of the new device we fabricated sub-micron sized prototypes of single-pixel RF-TES from Nb for operation temperature of 5.0 K. Results of DC and RF characterization of the TES devices along with measurement of the optical sensitivity at 0.65 THz and NEP will be presented and discussed.
Technical Physics Letters 37 (2011) 932
IEEE Trans. Terahertz Sci. and Tech.3 (2013) 25