Quantum Efficiency Study and Reflectivity Enhancement of Au/Bi Absorbers

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dc.contributor.authorHummatov, R.
dc.contributor.authorAdams, J. S.
dc.contributor.authorBandler, S. R.
dc.contributor.authorBarlis, A.
dc.contributor.authorBeaumont, S.
dc.contributor.authorChang, M. P.
dc.contributor.authorChervenak, J. A.
dc.contributor.authorDatesman, A. M.
dc.contributor.authorEckart, M. E.
dc.contributor.authorFinkbeiner, F. M.
dc.contributor.authorHa, J. Y.
dc.contributor.authorKelley, R. L.
dc.contributor.authorKilbourne, C. A.
dc.contributor.authorMiniussi, A. R.
dc.contributor.authorPorter, F. S.
dc.contributor.authorSadleir, J. E.
dc.contributor.authorSakai, K.
dc.contributor.authorSmith, S. J.
dc.contributor.authorWakeham, N.
dc.contributor.authorWassell, E. J.
dc.contributor.authorWollack, E. J.
dc.date.accessioned2020-04-10T16:17:31Z
dc.date.available2020-04-10T16:17:31Z
dc.date.issued2020-03-07
dc.description.abstractX-ray absorbers of the X-ray Integral Field Unit (X-IFU) microcalorimeters are required to provide high quantum efficiency (QE) for incident X-rays and high reflectivity to longer wavelength radiation. The thickness of the electroplated Au and Bi layers of the absorber is tuned to provide the desired pixel heat capacity and the QE. To calculate the QE precisely, in addition to filling factor, we have included the effects of surface roughness, edge profile of the absorbers and the effects of the different angles of incidence of the incoming X-rays from the X-IFU optic. Based on this analysis, it is found that thickness of the Bi layer needs to be adjusted by 4.3% to achieve the X-IFU QE requirements. To enhance the absorber’s rejection of low-energy radiation, a second thin layer of Au is sputter-deposited on top of the Bi layer. Optical measurements in the wavelength range 0.3–20 μm show a significant increase in reflectivity compared to a bare Bi layer.en_US
dc.description.sponsorshipThe authors wish to thank NASA’s Astrophysics Division for their generous support of this work. Part of this work was performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under Contract DE-AC52-07NA27344.en_US
dc.description.urihttps://link.springer.com/article/10.1007%2Fs10909-020-02424-3en_US
dc.format.extent8 pagesen_US
dc.genrejournal articlesen_US
dc.identifierdoi:10.13016/m2ubqv-qt72
dc.identifier.citationHummatov, R.; Adams, J. S.; Bandler, S. R.; Barlis, A.; Beaumont, S.; Chang, M. P.; Chervenak, J. A.; Datesman, A. M.; Eckart, M. E.; Finkbeiner, F. M.; Ha, J. Y.; Kelley, R. L.; Kilbourne, C. A.; Miniussi, A. R.; Porter, F. S.; Sadleir, J. E.; Sakai, K.; Smith, S. J.; Wakeham, N.; Wassell, E. J.; Wollack, E. J.; Quantum Efficiency Study and Reflectivity Enhancement of Au/Bi Absorbers; Journal of Low Temperature Physics volume 199, pages393–400(2020); https://link.springer.com/article/10.1007%2Fs10909-020-02424-3en_US
dc.identifier.urihttps://doi.org/10.1007/s10909-020-02424-3
dc.identifier.urihttp://hdl.handle.net/11603/17982
dc.language.isoen_USen_US
dc.publisherSpringer Nature Switzerland AG.en_US
dc.relation.isAvailableAtThe University of Maryland, Baltimore County (UMBC)
dc.relation.ispartofUMBC Center for Space Sciences and Technology
dc.relation.ispartofUMBC Physics Department
dc.relation.ispartofUMBC Faculty Collection
dc.rightsThis item is likely protected under Title 17 of the U.S. Copyright Law. Unless on a Creative Commons license, for uses protected by Copyright Law, contact the copyright holder or the author.
dc.rightsPublic Domain Mark 1.0*
dc.rightsThis work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
dc.rights.urihttp://creativecommons.org/publicdomain/mark/1.0/*
dc.titleQuantum Efficiency Study and Reflectivity Enhancement of Au/Bi Absorbersen_US
dc.typeTexten_US

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