Subgap kinetic inductance detector sensitive to 85-GHz radiation

Abstract

We have fabricated an array of subgap kinetic inductance detectors (SKIDs) made of granular aluminum ($T_c\sim$2~K) sensitive in the 80-90 GHz frequency band and operating at 300~mK. We measure a noise equivalent power of $1.3\times 10^{-16}$~W/Hz${}^{0.5}$ on average and $2.6\times 10^{-17}$~W/Hz${}^{0.5}$ at best, for an illuminating power of 50~fW per pixel. Even though the circuit design of SKIDs is identical to that of the kinetic inductance detectors (KIDs), the SKIDs operating principle is based on their sensitivity to subgap excitations. This detection scheme is advantageous because it avoids having to lower the operating temperature proportionally to the lowest detectable frequency. The SKIDs presented here are intrinsically selecting the 80-90 GHz frequency band, well below the superconducting spectral gap of the film, at approximately 180 GHz.

arXiv commentSuggestions and comments are welcome

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Cited by in corpus (3)

• Superconducting nitridized-aluminum thin films
• Granular Aluminum kinetic inductance nonlinearity
• Influence of growth parameters on the superconducting transition temperature in granular aluminum films