A Titanium Nitride Absorber for Controlling Optical Crosstalk in Horn-Coupled Aluminum LEKID Arrays for Millimeter Wavelengths

H. McCarrick, D. Flanigan, G. Jones, B. R. Johnson, P. A R Ade, K. Bradford, S. Bryan, R. Cantor, G. Che, P. Day, S. Doyle, H. Leduc, M. Limon, Philip Mauskopf, A. Miller, T. Mroczkowski, C. Tucker, J. Zmuidzinas

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

We discuss the design and measured performance of a titanium nitride (TiN) mesh absorber we are developing for controlling optical crosstalk in horn-coupled lumped-element kinetic inductance detector (LEKID) arrays for millimeter wavelengths. This absorber was added to the fused silica anti-reflection coating attached to previously characterized, 20-element prototype arrays of LEKIDs fabricated from thin-film aluminum on silicon substrates. To test the TiN crosstalk absorber, we compared the measured response and noise properties of LEKID arrays with and without the TiN mesh. For this test, the LEKIDs were illuminated with an adjustable, incoherent electronic millimeter-wave source. Our measurements show that the optical crosstalk in the LEKID array with the TiN absorber is reduced by 66 % on average, so the approach is effective and a viable candidate for future kilo-pixel arrays.

Original languageEnglish (US)
Pages (from-to)1-7
Number of pages7
JournalJournal of Low Temperature Physics
DOIs
StateAccepted/In press - Dec 29 2015

Keywords

  • Cosmic microwave background
  • Kinetic inductance detectors
  • Millimeter-wave sensors

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Atomic and Molecular Physics, and Optics
  • Materials Science(all)

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