High-sensitivity transition-edge-sensed bolometers: Improved speed and characterization with AC and DC bias

We report on efforts to improve the speed of low-G far-infrared transition-edged-sensed bolometers. We use a fabrication process that does not require any dry etch steps to reduce heat capacity on the suspended device and measure a reduction in the detector time constant. However, we also measure an...

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Bibliographic Details
Published in:Journal of applied physics 2023-09, Vol.134 (9)
Main Authors: Foote, Logan, Audley, Michael D., Bradford, Charles (Matt), de Lange, Gert, Echternach, Pierre, Fixsen, Dale J., Hui, Howard, Kenyon, Matthew, Nguyen, Hien, O’Brient, Roger, Sharp, Elmer H., Staguhn, Johannes G., van der Kuur, Jan, Zmuidzinas, Jonas
Format: Article
Language:English
Subjects:
Applied physics
Bolometers
Circuits
Near infrared radiation
Noise levels
Noise measurement
Thermal conductivity
Time constant
White noise
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Summary:We report on efforts to improve the speed of low-G far-infrared transition-edged-sensed bolometers. We use a fabrication process that does not require any dry etch steps to reduce heat capacity on the suspended device and measure a reduction in the detector time constant. However, we also measure an increase in the temperature-normalized thermal conductance (G) and a corresponding increase in the noise-equivalent power (NEP). We employ a new near-IR photon-noise technique using a near-IR laser to calibrate the frequency-domain multiplexed AC system and compare the results to a well-understood DC circuit. We measure an NEP white noise level of 0.8 aW/rtHz with a 1/f knee below 0.1 Hz and a time constant of 3.2 ms.
ISSN:0021-8979
1089-7550
DOI:10.1063/5.0157208