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Proceedings Paper

TES arrays for the short wavelength band of the SAFARI instrument on SPICA
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Paper Abstract

SPICA is an infra-red (IR) telescope with a cryogenically cooled mirror (~5K) with three instruments on board, one of which is SAFARI that is an imaging Fourier Transform Spectrometer (FTS) with three bands covering the wavelength of 34-210 μm. We develop transition edge sensors (TES) array for short wavelength band (34-60 μm) of SAFARI. These are based on superconducting Ti/Au bilayer as TES bolometers with a Tc of about 105 mK and thin Ta film as IR absorbers on suspended silicon nitride (SiN) membranes. These membranes are supported by long and narrow SiN legs that act as weak thermal links between the TES and the bath. Previously an electrical noise equivalent power (NEP) of 4×10-19 W/√Hz was achieved for a single pixel of such detectors. As an intermediate step toward a full-size SAFARI array (43×43), we fabricated several 8×9 detector arrays. Here we describe the design and the outcome of the dark and optical tests of several of these devices. We achieved high yield (<93%) and high uniformity in terms of critical temperature (<5%) and normal resistance (7%) across the arrays. The measured dark NEPs are as low as 5×10-19 W/√Hz with a response time of about 1.4 ms at preferred operating bias point. The optical coupling is implemented using pyramidal horns array on the top and hemispherical cavity behind the chip that gives a measured total optical coupling efficiency of 30±7%.

Paper Details

Date Published: 24 September 2012
PDF: 9 pages
Proc. SPIE 8452, Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI, 845209 (24 September 2012); doi: 10.1117/12.925334
Show Author Affiliations
P. Khosropanah, SRON Netherlands Institute for Space Research (Netherlands)
R. Hijmering, SRON Netherlands Institute for Space Research (Netherlands)
M. Ridder, SRON Netherlands Institute for Space Research (Netherlands)
J. R. Gao, SRON Netherlands Institute for Space Research (Netherlands)
Delft Univ. of Technology (Netherlands)
D. Morozov, Cardiff Univ. (United Kingdom)
P. D. Mauskopf, Cardiff Univ. (United Kingdom)
Arizona State Univ. (United States)
N. Trappe, National Univ. of Ireland, Maynooth (Ireland)
C. O'Sullivan, National Univ. of Ireland, Maynooth (Ireland)
A. Murphy, National Univ. of Ireland, Maynooth (Ireland)
D. Griffin, Rutherford Appleton Lab. (United Kingdom)
D. Goldie, Univ. of Cambridge (United Kingdom)
D. Glowacka, Univ. of Cambridge (United Kingdom)
S. Withington, Univ. of Cambridge (United Kingdom)
B. D. Jackson, SRON Netherlands Institute for Space Research (Netherlands)
M. D. Audley, SRON Netherlands Institute for Space Research (Netherlands)
G. de Lange, SRON Netherlands Institute for Space Research (Netherlands)


Published in SPIE Proceedings Vol. 8452:
Millimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VI
Wayne S. Holland, Editor(s)

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