Optical Measurements of SuperSpec: A Millimeter-Wave On-Chip Spectrometer

Hailey-Dunsheath, S.; Barry, P. S.; Bradford, C. M.; Chattopadhyay, Goutam; Day, Peter; Doyle, S.; Hollister, M. I.; Kovács, A.; Leduc, H. G.; Llombart, Nuria; Mauskopf, Philip Daniel; McKenney, Christopher; Monroe, Ryan; Nguyen, Hien; O’Brient, R.; Padin, S.; Reck, Theodore; Shirokoff, E.; Swenson, L. J.; Tucker, C.; Žmuidzinas, J.

doi:10.1007/s10909-013-1068-2

“…The SuperSpec concept is implemented with thin-film superconducting circuits and is described more fully elsewhere [4,[6][7][8][9]. Free space radiation is coupled into the feedline from a broadband antenna.…”

Section: Third-generation Superspec Prototypementioning

confidence: 99%

“…Previous SuperSpec prototypes have demonstrated the basic functionality of the filter bank, with spectral channels operating at R 250 [4,8,9]. We have fabricated a third-generation device with adjustments to the spectrometer layout intended to achieve lower R ∼ 100, which is a natural choice for a tomographic mapping experiment [2].…”

Section: Third-generation Superspec Prototypementioning

confidence: 99%

“…We probe the optical response of the circuit by making spectral scans with a swept coherent source [8]. A ratio of the response of a spectral channel to that of a broadband channel produces the normalized spectral profile, while the relative responses of broadband channels placed before and after the filter bank track the power removed from the line by the resonator.…”

Section: Spectral Profilesmentioning

confidence: 99%

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Low Noise Titanium Nitride KIDs for SuperSpec: A Millimeter-Wave On-Chip Spectrometer

Hailey-Dunsheath

¹

,

Shirokoff

²

,

Barry

³

et al. 2015

Self Cite

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SuperSpec is a novel on-chip spectrometer we are developing for multiobject, moderate resolution (R = 100-500), large bandwidth (∼1.65 : 1), submillimeter and millimeter survey spectroscopy of high-redshift galaxies. The spectrometer employs a filter bank architecture, and consists of a series of half-wave resonators formed by lithographically-patterned superconducting transmission lines. The signal power admitted by each resonator is detected by a lumped element titanium nitride (TiN) kinetic inductance detector operating at 100-200 MHz. We have tested a new prototype device that achieves the targeted R = 100 resolving power, and has better detector sensitivity and optical efficiency than previous devices. We employ a new method for measuring photon noise using both coherent and thermal sources of B S. Hailey-Dunsheath radiation to cleanly separate the contributions of shot and wave noise. We report an upper limit to the detector NEP of 1.4 × 10 −17 W Hz −1/2 , within 10 % of the photon noise-limited NEP for a ground-based R = 100 spectrometer.

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“…The approach and our progress are described in detail in a paper by Hailey-Dunsheath et al in these proceedings, as well in our previous publications. [23][24][25] We have demonstrated the essential filterbank functionality and are working to increase the net sensitivity of the devices. The current sensitivity at the front of the instrument for our Band-1 prototype is a factor of ∼10 from the performance of a background-limited R=100 spectrometer, and an additional factor of 2-3 from an X-Spec R=400-700 system.…”

Section: On-chip Spectrometermentioning

confidence: 99%

X-Spec: a multi-object trans-millimeter-wave spectrometer for CCAT

Bradford¹,

Hailey-Dunsheath²,

Shirokoff³

et al. 2014

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We present the result of a design study for X-Spec, a multi-beam, R=400-700 survey spectrometer covering 190-520 GHz under development for CCAT. It is designed to measure the bright atomic fine-structure and molecular rotational transitions that cool galaxies' interstellar gas, in particular, the 158 µm rest-frame [CII] transition, in thousands to tens of thousands of galaxies ranging from z=9 to z=3.5. With the wide bandwidth and multi-object capability, X-Spec / CCAT will be more powerful than ALMA for redshift-blind galaxy surveys and tomographic intensity mapping. X-Spec uses SuperSpec filterbank spectrometer technology with TiN KIDs described by Hailey-Dunsheath et al. in this conference. Because the density of sources is small, galaxy follow-up will be most efficient with a front-end steering unit which we have prototyped, also described in a separate paper (Chapman et al. in this conference). Our baseline instrument concept has 84 steered beams arrayed over the 1 degree CCAT field, each beam couples to 4 chips (2 bands x 2 polarizations) each chip with approximately 500 detectors, making a total of ∼170,000 KIDs in the full instrument. A direct imaging spectrometer (integral-field spectrometer) with a comparably-sized backend is also considered.

show abstract

“…The approach and our progress are described in detail in a paper by Hailey-Dunsheath et al in these proceedings, as well in our previous publications. [23][24][25] We have demonstrated the essential filterbank functionality and are working to increase the net sensitivity of the devices. The current sensitivity at the front of the instrument for our Band-1 prototype is a factor of ∼10 from the performance of a background-limited R=100 spectrometer, and an additional factor of 2-3 from an X-Spec R=400-700 system.…”

Section: On-chip Spectrometermentioning

confidence: 99%

X-Spec: A multi-object, trans-millimeter-wave spectrometer for CCAT

Chapman

¹

,

Bradford

²

,

Shirokoff

³

et al. 2014

2014 39th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz)

0

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We present the result of a design study for X-Spec, a multi-beam, R=400-700 survey spectrometer covering 190-520 GHz under development for CCAT. It is designed to measure the bright atomic fine-structure and molecular rotational transitions that cool galaxies' interstellar gas, in particular, the 158 µm rest-frame [CII] transition, in thousands to tens of thousands of galaxies ranging from z=9 to z=3.5. With the wide bandwidth and multi-object capability, X-Spec / CCAT will be more powerful than ALMA for redshift-blind galaxy surveys and tomographic intensity mapping. X-Spec uses SuperSpec filterbank spectrometer technology with TiN KIDs described by Hailey-Dunsheath et al. in this conference. Because the density of sources is small, galaxy follow-up will be most efficient with a front-end steering unit which we have prototyped, also described in a separate paper (Chapman et al. in this conference). Our baseline instrument concept has 84 steered beams arrayed over the 1 degree CCAT field, each beam couples to 4 chips (2 bands x 2 polarizations) each chip with approximately 500 detectors, making a total of ∼170,000 KIDs in the full instrument. A direct imaging spectrometer (integral-field spectrometer) with a comparably-sized backend is also considered.

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Optical Measurements of SuperSpec: A Millimeter-Wave On-Chip Spectrometer

Cited by 20 publications

References 4 publications

Low Noise Titanium Nitride KIDs for SuperSpec: A Millimeter-Wave On-Chip Spectrometer

Low Noise Titanium Nitride KIDs for SuperSpec: A Millimeter-Wave On-Chip Spectrometer

X-Spec: a multi-object trans-millimeter-wave spectrometer for CCAT

X-Spec: A multi-object, trans-millimeter-wave spectrometer for CCAT

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