Tunable sub-gap radiation detection with superconducting resonators

Abstract

We have fabricated planar amorphous Indium Oxide superconducting resonators ($T_c\sim 2.8$ K) that are sensitive to frequency-selective radiation in the range of 7 to 10 GHz. Those values lay far below twice the superconducting gap that worths about 200 GHz. The photons detection consists in a shift of the fundamental resonance frequency. We show that the detected frequency can be adjusted by modulating the total length of the superconducting resonator. We attribute those observations to the excitation of higher-order resonance modes. The coupling between the fundamental lumped and the higher order distributed resonance is due to the kinetic inductance non-linearity with current. These devices, that we have called Sub-gap Kinetic Inductance Detectors (SKIDs), are to be distinguished from the standard Kinetic Inductance Detectors (KIDs) in which quasi-particles are generated when incident light breaks down Cooper pairs.

arXiv commentarticle: 6 pages, 4 figures supplementary: 1 page, 2 figures

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• Localization of preformed Cooper-pairs in disordered superconductors
• A dual-band millimeter-wave kinetic inductance camera for the IRAM 30-meter telescope
• Operation of a titanium nitride superconducting microresonator detector in the nonlinear regime
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