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Title: Large arrays of dual-polarized multichroic TES detectors for CMB measurements with the SPT-3G receiver

Now, detectors for cosmic microwave background (CMB) experiments are background limited, so a straightforward alternative to improve sensitivity is to increase the number of detectors. Large arrays of multichroic pixels constitute an economical approach to increasing the number of detectors within a given focal plane area. We present the fabrication of large arrays of dual-polarized multichroic transition-edge-sensor (TES) bolometers for the South Pole Telescope third-generation CMB receiver (SPT-3G). The complete SPT-3G receiver will have 2690 pixels, each with six detectors, allowing for individual measurement of three spectral bands (centered at 95 GHz, 150 GHz and 220 GHz) in two orthogonal polarizations. In total, the SPT-3G focal plane will have 16140 detectors. Each pixel is comprised of a broad-band sinuous antenna coupled to a niobium microstrip transmission line. In-line filters are used to define the different band-passes before the millimeter-wavelength signal is fed to the respective Ti/Au TES sensors. Detectors are read out using a 64x frequency domain multiplexing (fMux) scheme. The microfabrication of the SPT-3G detector arrays involves a total of 18 processes, including 13 lithography steps. Together with the fabrication process, the effect of processing on the Ti/Au TES's T-c is discussed. In addition, detectors fabricated with Ti/Au TESmore » films with Tc between 400 mK 560 mK are presented and their thermal characteristics are evaluated. Optical characterization of the arrays is presented as well, indicating that the response of the detectors is in good agreement with the design values for all three spectral bands (95 GHz, 150 GHz, and 220 GHz). The measured optical efficiency of the detectors is between 0.3 and 0.8. Our results discussed here are extracted from a batch of research of development wafers used to develop the baseline process for the fabrication of the arrays of detectors to be deployed with the SPT-3G receiver. Results from these research and development wafers have been incorporated into the fabrication process to get the baseline fabrication process presented here. SPT-3G is scheduled to deploy to the South Pole Telescope in late 2016.« less
Authors:
 [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [5] ;  [6] ;  [7] ;  [8] ;  [6] ;  [6] ;  [6] ;  [2] ;  [4] ;  [4] ;  [4] ;  [9] ;  [5] ;  [2] ;  [2] more »;  [2] ;  [5] ;  [10] ;  [4] ;  [8] ;  [2] ;  [11] ;  [8] ;  [5] ;  [12] ;  [4] ;  [13] ;  [5] ;  [5] ;  [6] ;  [5] ;  [2] ;  [14] ;  [15] ;  [4] ;  [5] ;  [4] ;  [2] ;  [4] ;  [2] ;  [10] ;  [11] ;  [16] ;  [17] ;  [2] ;  [4] ;  [4] ;  [2] ;  [15] ;  [18] ;  [19] ;  [19] ;  [5] ;  [8] ;  [19] ;  [4] ;  [2] ;  [20] ;  [21] ;  [4] ;  [5] ;  [21] ;  [4] ;  [6] ;  [3] ;  [16] ;  [11] ;  [2] ;  [5] ;  [2] ;  [6] « less
  1. United Kingdom Astronomy Technology Centre, Edinburgh (United Kingdom)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Univ. of Wales, Cardiff (United Kingdom)
  4. Univ. of Chicago, IL (United States). Kavli Inst. for Cosmological Physics (KICP)
  5. Univ. of California, Berkeley, CA (United States)
  6. Stanford Univ., CA (United States). Kavli Institute for Particle Astrophysics and Cosmology
  7. Univ. of California, San Diego, CA (United States)
  8. Univ. of Colorado, Boulder, CO (United States)
  9. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  10. McGill Univ., Montreal, QC (Canada)
  11. Univ. of Illinois, Urbana-Champaign, IL (United States)
  12. High Energy Accelerator Research Organization (KEK), Tsukuba (Japan)
  13. NIST Quantum Devices Group, Boulder, CO (United States)
  14. Case Western Reserve Univ. (United States)
  15. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
  16. Univ. of Toronto, ON (Canada)
  17. Univ. of Colorado, Denver, CO (United States)
  18. Univ. of Melbourne (Australia)
  19. Case Western Reserve Univ., Cleveland, OH (United States)
  20. Harvard Univ., Cambridge, MA (United States). Harvard-Smithsonian Center for Astrophysics
  21. Univ. of Chicago, IL (United States)
Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Proceedings of SPIE - The International Society for Optical Engineering
Additional Journal Information:
Journal Volume: 9914; Journal Issue: Part 1; Journal ID: ISSN 0277-786X
Publisher:
SPIE
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF); Natural Sciences and Engineering Research Council of Canada (NSERC); Gordon and Betty Moore Foundation
Country of Publication:
United States
Language:
English
Subject:
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; Bolometers; CMB; Microfabrication; SPT-3G; South Pole Telescope; Superconducting Detectors; Transition Edge Sensors
OSTI Identifier:
1352656