Performance verification of a double-slot antenna with an elliptical lens for large format KID arrays

Lorenza Ferrari, Ozan Yurduseven, Nuria Llombart Juan, Stephen J.C. Yates, Andrey M. Baryshev, J. Bueno Lopez, Jochem J A Baselmans

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

5 Citations (Scopus)


Microwave Kinetic Inductance Detectors (MKIDs) are becoming a very promising candidate for next generation imaging instruments for the far infrared. A MKID consists of a superconducting resonator coupled to a feed-line used for the readout. In the devices presented here radiation coupling is achieved by coupling the MKID directly to planar antenna. The antenna is placed in the focus of an elliptical lens to increase the filling factor and to match efficiently to fore-optics. In this paper we present the design and the optical performance of MKIDs optimized for operation at 350 GHz. We have measured a device consisting of 14 pixels, characterized the coupling efficiency, antenna-lens frequency response and beam pattern and compared these to theoretical simulations. The optical efficiency has been measured by means of a black body radiator mounted in an ADR cryostat, through the variation of the black body temperature a variable illumination of each pixel (from 0.1 fW to 2 pW) is achieved. The frequency response and beam pattern have been directly measured in a He3 cryostat directly via the cryostat window and without the use of intermediate optics.

Original languageEnglish
Title of host publicationMillimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII
EditorsWayne S. Holland, Jonas Zmuidzinas
Place of PublicationBellingham, WA
Number of pages6
ISBN (Electronic)9781510602076
Publication statusPublished - 26 Jun 2016
EventMillimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII - Edinburgh, United Kingdom
Duration: 28 Jun 20161 Jul 2016

Publication series

NameProceedings of SPIE
ISSN (Electronic)0277-786X


ConferenceMillimeter, Submillimeter, and Far-Infrared Detectors and Instrumentation for Astronomy VIII
Country/TerritoryUnited Kingdom


  • Antenna-lens system
  • Cryogenic detectors
  • Optical measurements
  • Sub-mm astronomy

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