Fabrication of Antenna-Coupled KID Array for Cosmic Microwave Background Detection
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Kinetic inductance detectors (KIDs) have become an attractive alternative to traditional bolometers in the sub-mm and mm observing community due to their innate frequency multiplexing capabilities and simple lithographic processes. These advantages make KIDs a viable option for the O(500,000) detectors needed for the upcoming Cosmic Microwave Background-Stage 4 experiment. We have fabricated an antenna-coupled MKID array in the 150 GHz band optimized for CMB detection. Our design uses a twin-slot antenna coupled to an inverted microstrip made from a superconducting Nb/Al bilayer as the strip, a Nb ground plane and a SiN\(_x\) dielectric layer in between, which is then coupled to an Al KID grown on high-resistivity Si. We present the fabrication process and measurements of SiN\(_x\) microstrip resonators.
KeywordsFabrication Kinetic inductance detector Resonators Sub-mm wavelength
This work is partially supported by NSF Award #1554565 and the Kavli NSF-PFC3 Detector Development Grant. This work was supported in part by the Kavli Institute for Cosmological Physics at the University of Chicago through Grant NSF PHY-1125897 and an endowment from the Kavli Foundation and its founder Fred Kavli. This work made use of the Pritzker Nanofabrication Facility of the Institute for Molecular Engineering at the University of Chicago, which receives support from SHyNE, a node of the National Science Foundations National Nanotechnology Coordinated Infrastructure (NSF NNCI-1542205).
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