Development of Sub-micron Broadband Lens-Coupled LEKIDs for Sub-mm Astronomy

Gomez, A.;Prieto, P.;Bueno, J.;Doyle, S.;Barry, P.;Bideaud, A.;Llombart, N.;Granados, D.;Costa-Kramer, J. L.;Martin-Pintado, J.;Baselmans, J. J. A. 2016. Development of Sub-micron Broadband Lens-Coupled LEKIDs for Sub-mm Astronomy. Journal of Low Temperature Physics 184, 1-2, 148-153, DOI: 10.1007/s10909-016-1517-9 16th International Workshop on Low Temperature Particle Detection (LTD)

We present a fabrication method for sub-micron lens-coupled lumped element kinetic inductance detectors (LEKIDs) for broadband sub-millimeter (sub-mm) and THz radiation detection. The LEKIDs are fabricated from very thin (12 nm) and narrow (200 nm) aluminum lines to match the impedance of the LEKID to the substrate impedance. The fabrication process is based on a combination of maskless laserwriter lithography and electron beam lithography, providing low (few microns) and high resolution (down to 200 nm) over large areas in a single process. Preliminary optical characterization shows that the fabricated LEKIDs are sensitive to 1.5 THz radiation.

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