Development of an Optical Coupling with Ground-Side Absorption for Antenna-Coupled Kinetic Inductance Detectors

Hiroki WATANABE  Satoru MIMA  Shugo OGURI  Mitsuhiro YOSHIDA  Masashi HAZUMI  Hirokazu ISHINO  Hikaru ISHITSUKA  Atsuko KIBAYASHI  Chiko OTANI  Nobuaki SATO  Osamu TAJIMA  Nozomu TOMITA  

IEICE TRANSACTIONS on Electronics   Vol.E100-C   No.3   pp.298-304
Publication Date: 2017/03/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E100.C.298
Type of Manuscript: Special Section PAPER (Special Section on Leading-Edge Technologies of Superconducting Measurement Systems)
kinetic inductance detectors,  optical coupling,  superconducting detector,  

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Antenna-coupled kinetic inductance detectors (KIDs) have recently shown great promise as microwave detection systems with a large number of channels. However, this technique, still has difficulties in eliminating the radiation loss of the resonator signals. To solve this problem, we propose a design in which the absorption area connected to an antenna is located on the ground-side of a coplanar waveguide. Thereby, radiation loss due to leakage from the resonator to the antenna can be considerably reduced. This simple design also enables the use of a contact aligner for fabrication. We have developed KIDs with this design, named as the ground-side absorption (GSA)-KIDs and demonstrated that they have higher quality factors than those of the existing KIDs, while maintaining a good total sensitivity.