Full characterisation of a background limited antenna coupled KID over an octave of bandwidth for THz radiation

Bueno, J.; Yurduseven, Ozan; Yates, S. J. C.; Llombart, Nuria; Murugesan, Vignesh; Thoen, David J.; Baryshev, A.; Neto, A.; Baselmans, J. J. A.

doi:10.1063/1.4985060

Cited by 23 publications

(42 citation statements)

References 24 publications

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“…We explain the anticorrelation between NSD and grAl gap using a phonon trapping model in the surrounding Al ground plane. The measured NEP values for grAl MKIDs, scaled for maximum absorptance to allow for a fair comparison between different film resistivities, are in the range of 25 aW/ √ Hz, and are comparable to state of the art [16,[73][74][75][76].…”

Section: Discussionmentioning

confidence: 81%

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Interplay Between Kinetic Inductance, Nonlinearity, and Quasiparticle Dynamics in Granular Aluminum Microwave Kinetic Inductance Detectors

et al. 2019

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Microwave kinetic inductance detectors (MKIDs) are thin film, cryogenic, superconducting resonators. Incident Cooper pair-breaking radiation increases their kinetic inductance, thereby measurably lowering their resonant frequency. For a given resonant frequency, the highest MKID responsivity is obtained by maximizing the kinetic inductance fraction α. However, in circuits with α close to unity, the low supercurrent density reduces the maximum number of readout photons before bifurcation due to self-Kerr non-linearity, therefore setting a bound for the maximum α before the noise equivalent power (NEP) starts to increase. By fabricating granular aluminum MKIDs with different resistivities, we effectively sweep their kinetic inductance from tens to several hundreds of pH per square. We find a NEP minimum in the range of 25 aW/ √ Hz at α ≈ 0.9, which results from a trade-off between the onset of non-linearity and a non-monotonic dependence of the noise spectral density vs. resistivity.

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Section: Discussionmentioning

confidence: 81%

“…resistance R n ≈ 100 Ω, which is an order of magnitude larger than the typical values used in the MKID community [16,31,32,[73][74][75]. We plot the fitted values of the grAl superconducting gap ∆ in Fig.…”

Section: Measured H2mentioning

confidence: 99%

Interplay Between Kinetic Inductance, Nonlinearity, and Quasiparticle Dynamics in Granular Aluminum Microwave Kinetic Inductance Detectors

et al. 2019

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“…Yet the system demonstrated in this Article should be regarded as a narrow-band, single-pixel demonstrator, when compared to the vast potential scalability of the on-chip filterbank spectrometer concept. By using quarter-wavelength bandpass filters 17 and wideband antennas, 18,19 the filterbank can be naturally extended to a bandwidth of 1:3 (1.5 Octave). 9 For a 1:3 broad band system the out-of-band coupling of the individual filters must be below −40 dB with respect to the peak power coupling to limit out-of-band power loading the detectors.…”

Section: Discussionmentioning

confidence: 99%

Wideband on-chip terahertz spectrometer based on a superconducting filterbank

Endo

Karatsu

Laguna

et al. 2019

J. Astron. Telesc. Instrum. Syst.

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Terahertz spectrometers with a wide instantaneous frequency coverage for passive remote sensing are enormously attractive for many terahertz applications, such as astronomy, atmospheric science and security. Here we demonstrate a wide-band terahertz spectrometer based on a single superconducting chip. The chip consists of an antenna coupled to a transmission line filterbank, with a microwave kinetic inductance detector behind each filter. Using frequency division multiplexing, all detectors are read-out simultaneously creating a wide-band spectrometer with an instantaneous bandwidth of 45 GHz centered around 350 GHz. The spectrometer has a spectral resolution of F/∆F = 380 and reaches photon-noise limited sensitivity. We discuss the chip design and fabrication, as well as the system integration and testing. We confirm full system operation by the detection of an emission line spectrum of methanol gas. The proposed concept allows for spectroscopic radiation detection over large bandwidths and resolutions up to F/∆F ∼ 1000, all using a chip area of a few cm 2 . This will allow the construction of medium resolution imaging spectrometers with unprecedented speed and sensitivity.

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“…There are two main families of MKIDs: lumped element KIDs ("LEKIDs') [22] and lens-antenna coupled distributed MKIDs [23], [24]. The lumped element devices are easier to fabricate and assemble; the aluminum-based lens-antenna coupled devices are more flexible decoupling the KID optimization and the optical coupling allowing radiation coupling in principle at any wavelength from 3.3 mm (90 GHz) to 30 μm (10 THz) [25] by merely changing the antenna design. Around one mm wavelength aluminium LEKIDs and antenna coupled MKIDs have shown similar performance [7], [8], [18].…”

Section: Device Designmentioning

confidence: 99%

Antenna Coupled MKID Performance Verification at 850 GHz for Large Format Astrophysics Arrays

Ferrari

Yurduseven

Llombart

et al. 2018

IEEE Trans. THz Sci. Technol.

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Next generation sub-mm imaging instruments require kilo-pixel focal plane arrays filled with background limited detectors. Microwave kinetic inductance detectors (MKIDs) are a state-of-the-art detector for future instruments due to their inherent multiplexing capabilities. An MKID consists of a superconducting resonator coupled to a feed-line that is used for readout. In the device presented here radiation coupling is achieved by coupling the MKID directly to a planar antenna. The antenna is placed in the focus of an extended hemispherical lens to increase the filling factor and to match efficiently to fore optics. In this paper, we present the design and the optical performance of MKIDs optimized for operation in a 100-GHz band around 850 GHz. We have measured the coupling efficiency, frequency response, and beam patterns and compare those results to simulated performance. We obtain an excellent agreement between the measured and simulated beam pattern, frequency response, and absolute coupling efficiency between a thermal calibration source and the power absorbed in the detector. Additionally, we demonstrate that antenna coupled MKIDs offer background limited radiation detection down to ∼100 aW of power absorbed in the detector.

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Full characterisation of a background limited antenna coupled KID over an octave of bandwidth for THz radiation

Cited by 23 publications

References 24 publications

Interplay Between Kinetic Inductance, Nonlinearity, and Quasiparticle Dynamics in Granular Aluminum Microwave Kinetic Inductance Detectors

Interplay Between Kinetic Inductance, Nonlinearity, and Quasiparticle Dynamics in Granular Aluminum Microwave Kinetic Inductance Detectors

Wideband on-chip terahertz spectrometer based on a superconducting filterbank

Antenna Coupled MKID Performance Verification at 850 GHz for Large Format Astrophysics Arrays

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