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Optical Characterization of OMT-Coupled TES Bolometers for LiteBIRD

Journal Article · · Journal of Low Temperature Physics
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  1. National Inst. of Standards and Technology (NIST), Boulder, CO (United States); et al.; SLAC

Feedhorn- and orthomode transducer- (OMT) coupled transition edge sensor (TES) bolometers have been designed and micro-fabricated to meet the optical specifications of the LiteBIRD high frequency telescope (HFT) focal plane. Here, we discuss the design and optical characterization of two LiteBIRD HFT detector types: dual-polarization, dual-frequency-band pixels with 195/280 GHz and 235/337 GHz band centers. Results show well-matched passbands between orthogonal polarization channels and frequency centers within 3% of the design values. The optical efficiency of each frequency channel is conservatively reported to be within the range 0.64–0.72, determined from the response to a cryogenic, temperature-controlled thermal source. These values are in good agreement with expectations and either exceed or are within 10% of the values used in the LiteBIRD sensitivity forecast. Lastly, we report a measurement of loss in Nb/SiNx /Nb microstrip at 100 mK and over the frequency range 200–350 GHz, which is comparable to values previously reported in the literature.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC); National Aeronautics and Space Administration (NASA)
Grant/Contract Number:
AC02-76SF00515
OSTI ID:
1987322
Journal Information:
Journal of Low Temperature Physics, Journal Name: Journal of Low Temperature Physics Journal Issue: 3-4 Vol. 209; ISSN 0022-2291
Publisher:
Springer NatureCopyright Statement
Country of Publication:
United States
Language:
English

References (23)

Transition-Edge Sensors book July 2005
Multi-chroic Feed-Horn Coupled TES Polarimeters journal March 2012
Optical Measurements of SuperSpec: A Millimeter-Wave On-Chip Spectrometer journal January 2014
MUSTANG 2: A Large Focal Plane Array for the 100 m Green Bank Telescope journal January 2014
AlMn Transition Edge Sensors for Advanced ACTPol journal February 2016
Advanced ACTPol Cryogenic Detector Arrays and Readout journal March 2016
Advanced ACTPol Multichroic Polarimeter Array Fabrication Process for 150 mm Wafers journal March 2016
280 GHz Focal Plane Unit Design and Characterization for the Spider-2 Suborbital Polarimeter journal September 2018
Demonstration of 220/280 GHz Multichroic Feedhorn-Coupled TES Polarimeter journal January 2020
LiteBIRD Cryogenic Chain: 100 mK Cooling with Mechanical Coolers and ADRs journal February 2020
Development of Space-Optimized TES Bolometer Arrays for LiteBIRD journal March 2020
Time-division superconducting quantum interference device multiplexer for transition-edge sensors journal August 2003
An antenna-coupled bolometer with an integrated microstrip bandpass filter journal March 2005
Frequency-domain multiplexed readout of transition-edge sensor arrays with a superconducting quantum interference device journal March 2005
On-chip filter bank spectroscopy at 600–700 GHz using NbTiN superconducting resonators journal July 2013
BICEP2. II. Experiment And Three-Year Data Set journal August 2014
The Simons Observatory: science goals and forecasts journal February 2019
Probing primordial gravitational waves: Ali CMB Polarization Telescope journal February 2018
Superconducting Microstrip Losses at Microwave and Submillimeter Wavelengths journal July 2021
Low Loss Superconducting Microstrip Development at Argonne National Lab journal June 2015
Correction of Asymmetric Interferograms Obtained in Fourier Spectroscopy* journal January 1966
Infrared dielectric properties of low-stress silicon nitride journal January 2012
THE ATACAMA COSMOLOGY TELESCOPE: THE POLARIZATION-SENSITIVE ACTPol INSTRUMENT journal December 2016

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