http://arxiv.org/abs/2010.03845
We have fabricated an array of Sub-gap 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 measured a noise equivalent power of $1.3\times10^{-16}$~W/Hz$^{0.5}$ on average and $2.6\times10^{-17}$~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 sub-gap 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.
F. Levy-Bertrand, A. Benoît, O. Bourrion, et. al.
Fri, 9 Oct 20
19/64
Comments: Suggestions and comments are welcome