Superconducting Pathways Through Kilopixel Backshort–Under–Grid Arrays

Jhabvala, Christine A.; Benford, Dominic J.; Brekosky, Regis P.; Costen, Nicholas; Datesman, A.; Hilton, G. C.; Irwin, K. D.; Maher, Stephen F.; Manos, George; Miller, Timothy M.; Moseley, S. H.; Sharp, Elmer H.; Staguhn, Johannes; Wang, F.; Wollack, Edward J.

doi:10.1007/s10909-016-1487-y

Cited by 4 publications

(2 citation statements)

References 9 publications

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“…A realization of this back-termination absorber structure has been successfully implemented in the HAWC+ (Highresolution Airborne Wideband Camera) polarimeter on SOFIA (Stratospheric Observatory for Infrared Astronomy). 45,46 tration under NNH08ZDA009O-SOFIA2G is gratefully acknowledged by the authors.…”

Section: Discussionmentioning

confidence: 99%

A broadband micro-machined far-infrared absorber

Wollack

Datesman

Jhabvala

et al. 2016

Review of Scientific Instruments

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The experimental investigation of a broadband far-infrared meta-material absorber is described. The observed absorptance is > 0.95 from 1 − 20 THz (300 − 15 µm) over a temperature range spanning 5 − 300 K. The meta-material, realized from an array of tapers ≈ 100 µm in length, is largely insensitive to the detailed geometry of these elements and is cryogenically compatible with silicon-based micro-machined technologies. The electromagnetic response is in general agreement with a physically motivated transmission line model.

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Section: Discussionmentioning

confidence: 99%

A broadband micro-machined far-infrared absorber

Wollack

Datesman

Jhabvala

et al. 2016

Review of Scientific Instruments

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“…Starting with proven structures from the Submillimeter Common-User Bolometer Array II (SCUBA II)/Raytheon process and the James Webb Space Telescope (JWST) Microshutter assembly, we varied In film thicknesses and interface cleans to examine how superconducting properties change with the process used [2,3]. Additionally, with superconducting joints, a post-annealing step with temperatures approaching the melting point of In has been used for single-sided bump processes [4]. Typical X-ray detector absorber materials may also oxidize or interdiffuse at high temperatures; thus, we required that the assembly of the In bumps not use a post-annealing step.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Flexible Superconducting Wiring with High Current-Carrying Capacity Indium Interconnects

DeNigris¹,

Chervenak²,

Bandler³

et al. 2018

J Low Temp Phys

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The X-ray integral field unit (X-IFU) is a cryogenic spectrometer for the Advanced Telescope for High ENergy Astrophysics (ATHENA). ATHENA is a planned next-generation space-based X-ray observatory with capabilities that surpass the spectral resolution of prior missions. Proposed device designs contain up to 3840 transition edge sensors, each acting as an individual pixel on the detector, presenting a unique challenge for wiring superconducting leads in the focal plane assembly. In prototypes that require direct wiring, the edges of X-IFU focal plane have hosted aluminum wirebonding pads; however, indium (In) 'bumps' deposited on an interface layer such as molybdenum nitride (MoN) can instead be used as an array of superconducting interconnects. We investigated bumped MoN:In structures with different process cleans and layer thicknesses. Measurements of the resistive transitions showed variation of transition temperature T c as a function of bias and generally differed from the expected bulk T c of In (3.41 K). Observed resistance of the In bump structures at temperatures below the MoN transition (at 8.0 K) also depended on the varied parameters. For our proposed X-IFU geometry (10 μm of In mated to a 1μm In bump), we measured a minimum T c of 3.14 K at a bias current of 3 mA and a normal resistance of 0.59 mΩ per interconnect. We also investigated the design and fabrication of superconducting niobium (Nb) microstrip atop flexible polyimide. We present a process for integrating In bumps with the flexible Nb leads to enable high-density wiring for the ATHENA X-IFU focal plane.

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FIR Detector Sensitivity, Dynamic Range, and Multiplexing Requirements for the Origins Space Telescope (OST)

Staguhn

2018

J Low Temp Phys

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Superconducting Pathways Through Kilopixel Backshort–Under–Grid Arrays

Cited by 4 publications

References 9 publications

A broadband micro-machined far-infrared absorber

A broadband micro-machined far-infrared absorber

Fabrication of Flexible Superconducting Wiring with High Current-Carrying Capacity Indium Interconnects

FIR Detector Sensitivity, Dynamic Range, and Multiplexing Requirements for the Origins Space Telescope (OST)

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