Abstract
We describe the design and measurement of feedhorn-coupled, transition-edge sensor (TES) polarimeters with two passbands centered at 220 GHz and 280 GHz, intended for observations of the cosmic microwave background. Each pixel couples polarized light in two linear polarizations by use of a planar orthomode transducer and senses power via four TES bolometers, one for each band in each linear polarization. Previous designs of this detector architecture incorporated passbands from 27 to 220 GHz; we now demonstrate this technology at frequencies up to 315 GHz. Observational passbands are defined with an on-chip diplexer, and Fourier-transform-spectrometer measurements are in excellent agreement with simulations. We find coupling from feedhorn to TES bolometer using a cryogenic, temperature-controlled thermal source. We determine the optical efficiency of our device is \(\eta = 77\%\pm 6\%\) (\(75\%\pm 5\%\)) for 220 (280) GHz, relative to the designed passband shapes. Lastly, we compare two power-termination schemes commonly used in wide-bandwidth millimeter-wave polarimeters and find equal performance in terms of optical efficiency and passband shape.
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Acknowledgements
This work was supported in part by the NASA APRA program, Grant #NNX17AL23G. This material is based upon work supported by the National Science Foundation Graduate Research Fellowship under Grant No. DGE-1144083. Certain commercial software and materials are identified to specify the experimental study adequately. This does not imply endorsement by NIST nor that the software and materials are the best available for this purpose.
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Walker, S., Sierra, C.E., Austermann, J.E. et al. Demonstration of 220/280 GHz Multichroic Feedhorn-Coupled TES Polarimeter. J Low Temp Phys 199, 891–897 (2020). https://doi.org/10.1007/s10909-019-02316-1
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DOI: https://doi.org/10.1007/s10909-019-02316-1