An Ultrawideband Leaky Lens Antenna for Broadband Spectroscopic Imaging Applications

Hähnle, Sebastian; Yurduseven, Ozan; Berkel, Sven van; Llombart, Nuria; Bueno, J.; Yates, S. J. C.; Murugesan, Vignesh; Thoen, David J.; Neto, A.; Baselmans, J. J. A.

doi:10.1109/tap.2019.2963563

Cited by 14 publications

(13 citation statements)

References 20 publications

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“…The beam patterns are obtained by measuring the current response of the HEB operated in direct detector mode to a movable THz source as a function of the source XY position. The THz source used is a glow bar, IR-Si207 source from Hawk Eye Technologies, assembled in a setup similar to the one used in [26], mounted on a high precision XYZ stage, 3 axis 8MT295 Series from Standa, that scans the glow bar in front of the cryostat, where the HEB is mounted. The glow bar signal is chopped at a frequency of 38 Hz.…”

Section: B Lens-antenna Alignment Methodsmentioning

confidence: 99%

High Accuracy Pointing for Quasi-Optical THz Mixer Arrays

Gasparsilva

Finkel

Laauwen

et al. 2022

IEEE Trans. THz Sci. Technol.

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We report a high accuracy pointing technique for quasi-optical hot electron bolometer (HEB) mixers in focal-plane arrays designed to operate at 1.4, 1.9 and 4.7 THz. The high accuracy pointing is achieved by pre-alignment of a HEB chip to a lens, measuring the angular error of each mixer in an array assembly, and then re-alignment of the chip to the same lens to correct the error. The re-aligned mixers, using 5 mm diameter Si elliptical lenses designed for operation at 4.7 THz, show a final pointing error distribution with an average (µ) = 0.13 deg and standard deviation (σ) = 0.06 deg, with respect to the normal direction of the respective array plane. Those using 10 mm diameter lenses designed for operation either at 1.4 or 1.9 THz, show µ = 0.08 deg and σ = 0.03 deg. We demonstrated our pointing technique in five 4×2 HEB focal plane arrays developed for NASA's balloon borne GUSTO THz observatory. Our results corroborate the simulated beam steering factors used to calculate the re-alignment corrections. With the unprecedented pointing accuracy at the high frequencies, our technique can significantly facilitate the use of lens-antenna, quasi optical mixers for future focal-plane arrays, which is able to compete with traditional feedhorn-waveguide mixer arrays, operated typically below 1 THz, for astronomical instrumentation.

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Section: B Lens-antenna Alignment Methodsmentioning

confidence: 99%

High Accuracy Pointing for Quasi-Optical THz Mixer Arrays

Gasparsilva

Finkel

Laauwen

et al. 2022

IEEE Trans. THz Sci. Technol.

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“…We then define the microstrip lines in a second Nb-Ti-N layer of 300 nm (T c = 15.0 K, ρ n = 104 μ cm), using the same process as the first Nb-Ti-N layer. With the FPR and μWR finalized, we finish fabrication of the MKIDs and microwave readout line using a 1-μm-thick layer of polyimide LTC9505 and a 50-nm-thick layer of Al (T c = 1.25 K) [27]. Finally, a 40-nm-thick layer of β-phase Ta (T c = 0.7 K) is deposited on the backside and patterned into an absorbing mesh for stray light control [28].…”

Section: Device Fabricationmentioning

confidence: 99%

Superconducting Microstrip Losses at Microwave and Submillimeter Wavelengths

et al. 2021

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We present a lab-on-chip experiment to accurately measure losses of superconducting microstrip lines at microwave and submillimeter wavelengths. The microstrips are fabricated from Nb-Ti-N, which is deposited using reactive magnetron sputtering, and amorphous silicon which is deposited using plasmaenhanced chemical vapor deposition (PECVD). Submillimeter wave losses are measured using on-chip Fabry-Perot resonators (FPRs) operating around 350 GHz. Microwave losses are measured using shunted half-wave resonators with an identical geometry and fabricated on the same chip. We measure a loss tangent of the amorphous silicon at single-photon energies of tan δ = 3.7 ± 0.5 × 10 −5 at approximately 6 GHz and tan δ = 2.1 ± 0.1 × 10 −4 at 350 GHz. These results represent very low losses for deposited dielectrics, but the submillimeter wave losses are significantly higher than the microwave losses, which cannot be understood using the standard two-level system loss model.

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“…To achieve good coupling efficiencies across an octave bandwidth, we adopt the leaky-lens antenna design [17,18] for DESHIMA 2.0. Unlike the previous resonant double-slot antenna, it offers frequency-independent beams and high aperture efficiency at submillimeter wavelength [19]. Fig.…”

Section: The Quasi-optics Designmentioning

confidence: 99%

DESHIMA 2.0: development of an integrated superconducting spectrometer for science-grade astronomical observations

Taniguchi

Bakx²,

Baselmans³

et al. 2021

Preprint

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Integrated superconducting spectrometer (ISS) technology will enable ultra-wideband, integral-field spectroscopy for (sub)millimeter-wave astronomy, in particular, for uncovering the dust-obscured cosmic star formation and galaxy evolution over cosmic time. Here we present the development of DESHIMA 2.0, an ISS for ultra-wideband spectroscopy toward high-redshift galaxies. DESHIMA 2.0 is designed to observe the 220-440 GHz band in a single shot, corresponding to a redshift range of z = 3.3-7.6 for the ionized carbon emission ([C II] 158 µm). The first-light experiment of DESHIMA 1.0, using the 332-377 GHz band, has shown an excellent agreement among the on-sky measurements, the lab measurements, and the design. As a successor to DESHIMA 1.0, we plan the commissioning and the scientific observation campaign of DESHIMA 2.0 on the ASTE 10-m telescope in 2022. Ongoing upgrades for the full octave-bandwidth system include the wideband 347-channel chip design and the wideband quasi-optical system. For efficient measurements, we also develop the observation strategy using the mechanical fast sky-position chopper and the sky-noise removal technique based on a novel data-scientific approach. In the paper, we show the recent status of the upgrades and the plans for the scientific observation campaign.

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An Ultrawideband Leaky Lens Antenna for Broadband Spectroscopic Imaging Applications

Cited by 14 publications

References 20 publications

High Accuracy Pointing for Quasi-Optical THz Mixer Arrays

High Accuracy Pointing for Quasi-Optical THz Mixer Arrays

Superconducting Microstrip Losses at Microwave and Submillimeter Wavelengths

DESHIMA 2.0: development of an integrated superconducting spectrometer for science-grade astronomical observations

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