Fabrication of OMT-coupled MKIDs for CMB Observations

25 Jul 2019, 17:45
1h 15m
Piazza Città di Lombardia (Milano)

Piazza Città di Lombardia

Milano

Piazza Città di Lombardia, 1, 20124 Milano MI
Poster Low Temperature Detector fabrication techniques and materials Poster session

Speaker

Ms Qing Yang Tang (University of Chicago)

Description

Future cosmic microwave background (CMB) experiments, including the large scale ground based Stage Four CMB Experiment (CMB-S4), satellites, and balloons, aim to map the CMB to an unprecedented precision in order to answer several key questions in cosmology. However, to reach the target noise sensitivity, more than 100,000 detectors will be needed. Microwave Kinetic Inductance Detectors (MKIDs) are ideal detectors for experiments using large number of detectors due to their intrinsic multiplexing capabilities and ease of fabrication. We present fabrication procedure for making a prototype orthomode transducer (OMT)-coupled MKID array optimized for CMB observations. These devices are made from silicon-on-insulator (SOI) wafers. A set of planar OMTs couples the two polarizations of light from our feedhorn to separate Nb/SiN/Nb microstrips, which are then coupled to Al lumped-element KIDs (LEKIDs). The silicon and oxide layer on the backside of the OMT and MKIDs are etched away using deep reactive ion etch (DRIE) for better optical coupling and two-level system (TLS) noise mitigation. We also show the preliminary results from optical and dark testing measurements.

Less than 5 years of experience since completion of Ph.D Y
Student (Ph.D., M.Sc. or B.Sc.) Y

Primary authors

Ms Qing Yang Tang (University of Chicago) Dr Peter S. Barry (Argonne National Laboratory) Dr Thomas W. Cecil (Argonne National Laboratory) Erik Shirokoff (University of Chicago)

Presentation Materials

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