Optical and thermal properties of ANL/KICP polarization sensitive bolometers for SPTpol

C. L. Chang, P. Ade, K. Aird, J. Austermann, J. Beall, D. Becker, B. Benson, L. Bleem, J. Britton, J. Carlstrom, H. Cho, T. De Haan, T. Crawford, A. Crites, A. Datesman, M. Dobbs, W. Everett, A. Ewall-Wice, E. George, N. HalversonN. Harrington, J. Henning, G. Hilton, W. Holzapfel, S. Hoover, J. Hubmayr, K. Irwin, R. Keisler, J. Kennedy, A. Lee, E. Leitch, D. Li, M. Lueker, D. P. Marrone, J. McMahon, J. Mehl, S. Meyer, J. Montgomery, T. Montroy, T. Natoli, J. Nibarger, M. Niemack, V. Novosad, S. Padin, C. Pryke, C. Reichardt, J. Ruhl, B. Saliwanchik, J. Sayre, K. Schafer, E. Shirokoff, K. Story, K. Vanderlinde, J. Vieira, G. Wang, R. Williamson, V. Yefremenko, K. W. Yoon, E. Young

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

We present recent optical and thermal characterizations of polarization sensitive mm-wave bolometers fabricated at Argonne National Lab. The devices are designed to measure the polarization of the Cosmic Microwave Background and consist of a Mo/Au TES suspended on SiN with a Pd-Au dipole absorber. The detector performance is excellent with >85% co-polar coupling, <1% cross-polar leakage, 36 GHz optical bandwidth, electrothermal loop gains of approximately 10, and NEP ≃50 aWHz-1/2.

Original languageEnglish (US)
Pages (from-to)865-871
Number of pages7
JournalJournal of Low Temperature Physics
Volume167
Issue number5-6
DOIs
StatePublished - Jun 2012

Bibliographical note

Funding Information:
Fig. 5 (Color online) The thermal response [1] of a ANL/KICP bolometer at various depths in the transition. At an operating depth of 0.69Rn, the detector has a thermal time constant of 0.9 ms corresponding to an electro-thermal gain of ∼9 and exhibits no signs of thermal instability Fig. 6 (Color online) Dark noise equivalent power at 0.69Rn for an ANL/KICP detector with 33 pW saturation power. The noise is modeled (green line) as a low frequency component together with a white noise floor. Above 0.1 Hz, the noise is dominated by the white noise (red line) which is 57 aW Hz−1/2 and is consistent with noise contributions from the readout system, Johnson noise, and thermal carrier fluctuations. This noise spectrum is nearly background limited for typical observing conditions expected for SPTpol Acknowledgements Work at the University of Chicago is supported by grants from the NSF (awards ANT-0638937 and PHY-0114422), the Kavli Foundation, and the Gordon and Betty Moore Foundation. The work at Argonne National Laboratory, including the use of facility at the Center for Nanoscale Materials (CNM), was supported by the Office of Science (Basic Energy Sciences and High Energy Physics) of the US Department of Energy. Technical support from Nanofabrication Group at the CNM, Argonne National Laboratory, is gratefully acknowledged.

Keywords

  • Bolometers
  • CMB
  • Transition edge sensors

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