The kinetic inductance detector (KID) — also known as a microwave kinetic inductance detector (MKID) — is a type of superconductingphoton detector capable of counting single photons whilst simultaneously measuring their energy and arrival time to high precision. They were first developed by scientists at the California Institute of Technology and the Jet Propulsion Laboratory in 2003.[1] These devices operate at cryogenic temperatures, typically below 1 kelvin. They are being developed for high-sensitivity astronomical detection for frequencies ranging from the far-infrared to X-rays.
Principle of operation
Photons incident on a strip of superconducting material break Cooper pairs and create excess quasiparticles. The kinetic inductance of the superconducting strip is inversely proportional to the density of Cooper pairs, and thus the kinetic inductance increases upon photon absorption. This inductance is combined with a capacitor to form a microwaveresonator whose resonant frequency changes with the absorption of photons. This resonator-based readout is useful for developing large-format detector arrays, as each KID can be addressed by a single microwave tone and many detectors can be measured using a single broadband microwave channel, a technique known as frequency-division multiplexing.
^Heyminck, S.; Klein, B.; Güsten, R.; Kasemann, C.; Baryshev, A.; Baselmans, J.; Yates, S.; Klapwijk, T. M. (2010). "Development of a MKID Camera for APEX". Twenty-First International Symposium on Space Terahertz Technology: 262. Bibcode:2010stt..conf..262H.
Champlin, K.S.; Armstrong, D.B.; Gunderson, P.D. (1964). "Charge carrier inertia in semiconductors". Proceedings of the IEEE. 52 (6). Institute of Electrical and Electronics Engineers (IEEE): 677–685. doi:10.1109/proc.1964.3049. ISSN0018-9219.
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