Development of Ultra-Low-Noise TES Bolometer Arrays
T. Suzuki (SRON–Netherlands Institute for Space Research, Institute of Space and Astronautical Science (ISAS)/JAXA)
P. Khosropanah (SRON–Netherlands Institute for Space Research)
Marcel L. Ridder (SRON–Netherlands Institute for Space Research)
R. A. Hijmering (SRON–Netherlands Institute for Space Research)
J.R. Gao (TU Delft - QN/Gao Lab, SRON–Netherlands Institute for Space Research)
H. Akamatsu (SRON–Netherlands Institute for Space Research)
L. Gottardi (SRON–Netherlands Institute for Space Research)
J van der Kuur (SRON–Netherlands Institute for Space Research)
BD Jackson (SRON–Netherlands Institute for Space Research)
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Abstract
SRON is developing ultra-low-noise transition edge sensors (TESs) based on a superconducting Ti/Au bilayer on a suspended SiN island with SiN legs for SAFARI aboard SPICA. We have two major concerns about realizing TESs with an ultra-low NEP of 2×10-19W/Hz: achieving lower thermal conductance and no excess noise with respect to the phonon noise. To realize TESs with phonon-noise-limited NEPs, we need to make thinner (c of ∼93mK and Rn of ∼158mΩ. These TESs were characterized under AC bias using our frequency-division multiplexing readout (1–3 MHz) system. TESs without the absorber show NEPs as low as 1.1×10-19W/Hz with a reasonable response speed (
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