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We discuss the design and measured performance of a titanium nitride (TiN)mesh absorber we are developing for controlling optical crosstalk inhorn-coupled lumped-element kinetic inductance detector arrays formillimeter-wavelengths. This absorber was added to the fused silicaanti-reflection coating attached to previously-characterized, 20-elementprototype arrays of LEKIDs fabricated from thin-film aluminum on siliconsubstrates. To test the TiN crosstalk absorber, we compared the measuredresponse and noise properties of LEKID arrays with and without the TiN mesh.For this test, the LEKIDs were illuminated with an adjustable, incoherentelectronic millimeter-wave source. Our measurements show that the opticalcrosstalk in the LEKID array with the TiN absorber is reduced by 66\% onaverage, so the approach is effective and a viable candidate for futurekilo-pixel arrays.

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