Kinetic Inductance Detectors (KIDs) are superconducting microresonator devices (in the most simple picture, an RLC circuit made of superconductor), with very high Q factors (104-106). When resonators are coupled to transmission line, the interaction of a photon or a phonon with the detector breaks Cooper Pairs (CPs) and modify the resonator transmission (S21). The resonant frequency typically ranges between 0.1-10 GHz.
The key features of KIDs consist in the excellent intrinsic energy resolution, and in the possibility of easily tuning each detector to a diff.erent resonant frequency. This natural aptitude to frequency multiplexed read-out allows to operate hundreds or thousands of KIDs with two cryogenic cables and one cryogenic amplifier. In addition, since the electronics is located at room temperature, the installation of KIDs arrays on detectors would only require minor modifications to the pre-existing cryogenic facilities.
Experimentally the signal is obtained by exciting the circuit at the resonant frequency, and by measuring the phase (inductance) and amplitude (resistance) variations induced by energy releases. Many KIDs can be coupled to the same
From their first applications in photon detection, KIDs became rapidly subject
CALDER (particle physics)
PNRA KID (astrophysics)
Incoming: cooming soon
dr. Ivan Colantoni, PhD
(a) Photons with hν>2Δ absorbed in the su perconductor film (the inductor) producing quasiparticles. (b) Equivalent circuit to measure these quasiparticles
Power (c) and phase (d) of a microwave excitation signal sent trough the resonator before (straight line) and after (dotted line) an energy absorption
Photons absorption : the resonance shift to low frequency and get shallower