Design of an Integrated Filterbank for DESHIMA: On-Chip Submillimeter Imaging Spectrograph Based on Superconducting Resonators

Endo, Akira; Werf, P. van der; Janssen, R. M. J.; Visser, Pieter de; Klapwijk, T. M.; Baselmans, J. J. A.; Ferrari, L.; Baryshev, A.; Yates, S. J. C.

doi:10.1007/s10909-012-0502-1

Cited by 34 publications

(25 citation statements)

References 11 publications

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“…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. The stray radiation coupling to 'blind MKIDs' in our design is already good enough, but the current filter design has spurious resonances and will not fulfill this requirement.…”

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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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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“…This is a low-level effect that will become more important for large focal plane arrays or any large array requiring low pixel-pixel on chip optical crosstalk. For example, spectrometer on chip applications [29], [30], [31] also require high on chip rejection of out of band and stray radiation, so similar solutions to absorb surface wave contributions are required [32].…”

Section: Discussionmentioning

confidence: 99%

Surface Wave Control for Large Arrays of Microwave Kinetic Inductance Detectors

Yates¹,

Baryshev

Yurduseven

et al. 2017

IEEE Trans. THz Sci. Technol.

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Large ultra-sensitive detector arrays are needed for present and future observatories for far infra-red, submillimeter wave (THz), and millimeter wave astronomy. With increasing array size, it is increasingly important to control stray radiation inside the detector chips themselves, the surface wave. We demonstrate this effect with focal plane arrays of 880 lens-antenna coupled Microwave Kinetic Inductance Detectors (MKIDs). Presented here are near field measurements of the MKID optical response versus the position on the array of a reimaged optical source. We demonstrate that the optical response of a detector in these arrays saturates off-pixel at the ∼ −30 dB level compared to the peak pixel response. The result is that the power detected from a point source at the pixel position is almost identical to the stray response integrated over the chip area. With such a contribution, it would be impossible to measure extended sources, while the point source sensitivity is degraded due to an increase of the stray loading. However, we show that by incorporating an on-chip stray light absorber, the surface wave contribution is reduced by a factor >10. With the on-chip stray light absorber the point source response is close to simulations down to the ∼ −35 dB level, the simulation based on an ideal Gaussian illumination of the optics. In addition, as a crosscheck we show that the extended source response of a single pixel in the array with the absorbing grid is in agreement with the integral of the point source measurements.

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“…This property can be used to make the system compact. On the other hand, it puts a strong demand on the lithographic process that determines the length of the resonant filters [36].…”

Section: Filterbankmentioning

confidence: 99%

Superconducting On-Chip Spectrometery for Millimeter-submillimeter Wave Astronomy

Endo

2015

IEICE Trans. Electron.

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Design of an Integrated Filterbank for DESHIMA: On-Chip Submillimeter Imaging Spectrograph Based on Superconducting Resonators

Cited by 34 publications

References 11 publications

Wideband on-chip terahertz spectrometer based on a superconducting filterbank

Wideband on-chip terahertz spectrometer based on a superconducting filterbank

Surface Wave Control for Large Arrays of Microwave Kinetic Inductance Detectors

Superconducting On-Chip Spectrometery for Millimeter-submillimeter Wave Astronomy

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