# A Titanium Nitride Absorber for Controlling Optical Crosstalk in Horn-Coupled Aluminum LEKID Arrays for Millimeter Wavelengths Source: [A Titanium Nitride Absorber for Controlling Optical Crosstalk in Horn-Coupled Aluminum LEKID Arrays for Millimeter Wavelengths]() Collection index: [llms.txt]() Data updated: 2025-10-24T19:44:24.214Z Authors: 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, P. Mauskopf, A. Miller, T. Mroczkowski, C. Tucker, J. Zmuidzinas Published: 2015-12-06T22:29:26.000Z ## 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 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. ## Recorded benchmark results A research result applies to its stated dataset, split, metric and evaluation configuration. Compare like-for-like settings, preserve the metric's unit and direction, and distinguish paper-reported results from independent reproduction. The best result recorded here is not a claim of exhaustive, current global coverage. ## Original sources and implementation [Original paper]() [PDF]()