Lumped element kinetic inductance detectors

Simon Doyle, Jack Naylon, Philip Mauskopf, Adrian Porch

Research output: Chapter in Book/Report/Conference proceedingConference contribution

8 Scopus citations


Kinetic Inductance Detectors (KIDs) provide a promising solution to the problem of producing large format arrays of ultra sensitive detectors for astronomy. Traditionally KIDs have been constructed from superconducting quarter-wavelength or half-wavelength resonator elements capacitivly coupled to a co-planar feed line. Photons are detected by measuring the change in quasi-particle density caused by the splitting of Cooper pairs in the superconducting resonant element. This change in quasi-particle density alters the kinetic inductance, and hence the resonant frequency of the resonant element. This arrangement requires the quasi-particles generated by photon absorption to be concentrated at positions of high current density in the resonator. This is usually achieved through antenna coupling or quasi-particle trapping. For these detectors to work at wavelengths shorter than around 500 μm where antenna coupling can introduce a significant loss of efficiency, then a direct absorption method needs to be considered. One solution to this problem is the Lumped Element KID (LEKID), which shows no current variation along its length and can be arranged into a photon absorbing area coupled to free space and therefore requiring no antennas or quasi-particle trapping. This paper outlines the relevant microwave theory of a LEKID, along with theoretical performance for these devices.

Original languageEnglish (US)
Title of host publicationProceedings of the Eighteenth International Symposium on Space Terahertz Technology 2007, ISSTT 2007
Number of pages8
StatePublished - 2007
Externally publishedYes
Event18th International Symposium on Space Terahertz Technology 2007, ISSTT 2007 - Pasadena, CA, United States
Duration: Mar 21 2007Mar 23 2007


Other18th International Symposium on Space Terahertz Technology 2007, ISSTT 2007
Country/TerritoryUnited States
CityPasadena, CA

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Space and Planetary Science
  • Electrical and Electronic Engineering
  • Atomic and Molecular Physics, and Optics
  • Radiation


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