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Astrophysics > Instrumentation and Methods for Astrophysics
Title: A 25-micron single photon sensitive kinetic inductance detector
(Submitted on 16 Apr 2024 (v1), last revised 14 May 2024 (this version, v3))
Abstract: We report measurements characterizing the performance of a kinetic inductance detector array designed for a wavelength of 25 microns and very low optical background level suitable for applications such as a far-infrared instrument on a cryogenically cooled space telescope. In a pulse counting mode of operation at low optical flux, the detectors can resolve individual 25-micron photons. In an integrating mode, the detectors remain photon noise limited over more than six orders of magnitude in absorbed power from 70 zW to 200 fW, with a limiting NEP of 4.6 x 10^-20 W/rtHz at 1 Hz. In addition, the detectors are highly stable with flat power spectra under optical load down to 1 mHz. Operational parameters of the detector are determined including the efficiency of conversion of the incident optical power into quasiparticles in the aluminum absorbing element and the quasiparticle self-recombination constant.
Submission history
From: Peter Day [view email][v1] Tue, 16 Apr 2024 02:47:47 GMT (7510kb,D)
[v2] Sat, 27 Apr 2024 23:44:42 GMT (7628kb,D)
[v3] Tue, 14 May 2024 22:23:51 GMT (7753kb,D)
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