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Baselmans, J.J.A. (author), Facchin, F. (author), Pascual Laguna, A. (author), Bueno, J. (author), Thoen, David (author), Murugesan, V. (author), Llombart, Nuria (author), de Visser, P.J. (author)Aims. Future actively cooled space-borne observatories for the far-infrared, loosely defined as a 1-10 THz band, can potentially reach a sensitivity limited only by background radiation from the Universe. This will result in an increase in observing speed of many orders of magnitude. A spectroscopic instrument on such an observatory requires...journal article 2022
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de Visser, P.J. (author), de Rooij, S.A.H. (author), Murugesan, V. (author), Thoen, David (author), Baselmans, J.J.A. (author)A noiseless, photon-counting detector, which resolves the energy of each photon, could radically change astronomy, biophysics, and quantum optics. Superconducting detectors promise an intrinsic resolving power at visible wavelengths of R=E/δE≈100 due to their low excitation energy. We study superconducting energy-resolving microwave kinetic...journal article 2021
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Hähnle, S.A. (author), Kouwenhoven, K. (author), Buijtendorp, B.T. (author), Endo, A. (author), Karatsu, K. (author), Thoen, David (author), Murugesan, V. (author), Baselmans, J.J.A. (author)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 plasma-enhanced chemical vapor deposition (PECVD)....journal article 2021
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Pascual Laguna, A. (author), Karatsu, K. (author), Thoen, David (author), Murugesan, Vignesh (author), Buijtendorp, B.T. (author), Endo, A. (author), Baselmans, J.J.A. (author)A superconducting microstrip half-wavelength resonator is proposed as a suitable band-pass filter for broadband moderate spectral resolution spectroscopy for terahertz (THz) astronomy. The proposed filter geometry has a free spectral range of an octave of bandwidth without introducing spurious resonances, reaches a high coupling efficiency in...journal article 2021
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De Rooij, Steven A.H. (author), Baselmans, J.J.A. (author), Murugesan, V. (author), Thoen, David (author), de Visser, P.J. (author)We measure temperature-dependent quasiparticle fluctuations in a small Al volume, embedded in a NbTiN superconducting microwave resonator. The resonator design allows for readout close to equilibrium. By placing the Al film on a membrane, we enhance the fluctuation level and separate quasiparticle effects from phonon effects. When lowering...journal article 2021
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Alfaro Barrantes, J.A. (author), Mastrangeli, Massimo (author), Thoen, David (author), Visser, Sten (author), Bueno Lopez, J. (author), Baselmans, J.J.A. (author), Sarro, Pasqualina M (author)This paper describes the microfabrication and electrical characterization of aluminum-coated superconducting through-silicon vias (TSVs) with sharp superconducting transition above 1 K. The sharp superconducting transition was achieved by means of fully conformal and void-free DC-sputtering of the TSVs with Al, and is here demonstrated in up...journal article 2021
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Delabrouille, Jacques (author), Abitbol, Maximilian H. (author), Aghanim, Nabila (author), Ali-Haïmoud, Yacine (author), Alonso, David (author), Alvarez, Marcelo (author), Baselmans, J.J.A. (author), Endo, A. (author), Karatsu, K. (author)This paper discusses the science case for a sensitive spectro-polarimetric survey of the microwave sky. Such a survey would provide a tomographic and dynamic census of the three-dimensional distribution of hot gas, velocity flows, early metals, dust, and mass distribution in the entire Hubble volume, exploit CMB temperature and polarisation...journal article 2021
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Pascual Laguna, A. (author), Karatsu, K. (author), Thoen, David (author), Murugesan, V. (author), Endo, A. (author), Baselmans, J.J.A. (author)A superconducting on-chip microstrip filter bank spectrometer prototype for Far-Infrared (FIR) Astronomy is presented. The measurements showcase its capabilities towards moderate spectral resolution (f/\Delta f\sim 500) broadband FIR spectroscopy. In this sub-mm-wave filter bank, each spectral channel consists of an 'I-shaped' microstrip THz...conference paper 2020
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Alfaro Barrantes, J.A. (author), Mastrangeli, Massimo (author), Thoen, David (author), Visser, Sven (author), Bueno Lopez, J. (author), Baselmans, J.J.A. (author), Sarro, Pasqualina M (author)This paper presents the fabrication and electrical characterization of superconducting high-aspect ratio through-silicon vias DC-sputtered with aluminum. Fully conformal and void-free coating of 300 μm-deep and 50 μmwide vias with Al, a CMOS-compatible and widely available superconductor, was made possible by tailoring a funneled sidewall...journal article 2020
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Baselmans, J.J.A. (author), Bosma, S. (author), Ikarashi, S. (author), Klapwijk, T.M. (author), Llombart, Nuria (author), Pascual Laguna, A. (author), Thoen, David (author), de Visser, P.J. (author), Yurduseven, O. (author), Endo, A. (author)We are developing an ultra-wideband spectroscopic instrument, DESHIMA (DEep Spectroscopic HIgh-redshift MApper), based on the technologies of an on-chip filter bank and microwave kinetic inductance detector (MKID) to investigate dusty starburst galaxies in the distant universe at millimeter and submillimeter wavelengths. An on-site experiment of...journal article 2020
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Hähnle, S.A. (author), Yurduseven, Ozan (author), van Berkel, S.L. (author), Llombart, Nuria (author), Bueno, Juan (author), Yates, Stephen J.C. (author), Murugesan, Vignesh (author), Thoen, David (author), Neto, A. (author), Baselmans, J.J.A. (author)We present the design, fabrication, and characterization of a broadband leaky lens antenna for broadband, spectroscopic imaging applications. The antenna is designed for operation in the 300-900 GHz band. We integrate the antenna directly into an Al-NbTiN hybrid microwave kinetic inductance detector (MKID) to measure the beam pattern and...journal article 2020
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Hähnle, S.A. (author), van Marrewijk, N.T. (author), Endo, A. (author), Karatsu, K. (author), Thoen, David (author), Murugesan, Vignesh (author), Baselmans, J.J.A. (author)We present a lab-on-chip technique to measure the very low losses in superconducting transmission lines at (sub-) mm wavelengths. The chips consist of a 100 nm-thick NbTiN Co-planar Waveguide (CPW) Fabry–Pérot (FP) resonator, coupled, on one side, to an antenna and, on the other side, to a Microwave Kinetic Inductance detector. Using a single...journal article 2020
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Kohno, Kotaro (author), Kawabe, Ryohei (author), Tamura, Yoichi (author), Endo, A. (author), Baselmans, J.J.A. (author), Karatsu, K. (author), Inoue, Akio K. (author), Moriwaki, Kana (author), Hayatsu, Natsuki H. (author)We present a conceptual study of a large format imaging spectrograph for next-generation large (50-m class) single-dish telescopes, i.e., the Large Submillimeter Telescope (LST) and Atacama Large Aperture Submillimeter Telescope (AtLAST). Recent discoveries of high-redshift star-forming galaxies at z=8-9 and candidate quiescent galaxies at z~6...conference paper 2020
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Endo, A. (author), Pascual Laguna, A. (author), Hähnle, S.A. (author), Karatsu, K. (author), Thoen, David (author), Murugesan, V. (author), Baselmans, J.J.A. (author)Superconducting resonators and transmission lines are fundamental building blocks of integrated circuits for millimeter-submillimeter astronomy. Accurate simulation of radiation loss from the circuit is crucial for the design of these circuits because radiation loss increases with frequency, and can thereby deteriorate the system performance....conference paper 2020
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Buijtendorp, B.T. (author), Bueno, J. (author), Thoen, David (author), Sberna, V. Murugesan P.M. (author), Baselmans, J.J.A. (author), Vollebregt, S. (author), Endo, A. (author)Superconducting resonators used in millimeter-submillimeter astronomy would greatly benefit from deposited dielectrics with a small dielectric loss. We deposited hydrogenated amorphous silicon films using plasma-enhanced chemical vapor deposition, at substrate temperatures of 100°C, 250°C and 350°C. The measured void volume fraction, hydrogen...conference paper 2020
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Alfaro Barrantes, J.A. (author), Mastrangeli, Massimo (author), Thoen, David (author), Bueno Lopez, J. (author), Baselmans, J.J.A. (author), Sarro, Pasqualina M (author)We describe a microfabrication process that, thanks to a specifically tailored sidewall profile, enables for the first-time wafer-scale arrays of high-aspect ratio through-silicon vias (TSVs) coated with DC-sputtered Aluminum, achieving at once superconducting and CMOS-compatible 3D interconnects. Void-free conformal coating of up to 500μm...conference paper 2020
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Huijten, Esmee (author), Roelvink, Yannick (author), Brackenhoff, Stefanie A. (author), Bakx, Tom J.L.C. (author), Zaalberg, Stan (author), Baselmans, J.J.A. (author), Karatsu, K. (author), van Hoven, M.B. (author), Endo, A. (author)The next technological breakthrough in millimeter-submillimeter astronomy is 3D imaging spectrometry with wide instantaneous spectral bandwidths and wide fields of view. The total optimization of the focal-plane instrument, the telescope, the observing strategy, and the signal-processing software must enable efficient removal of foreground...conference paper 2020
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Dabironezare, Shahab Oddin (author), Carluccio, G. (author), Pascual Laguna, A. (author), Hähnle, S.A. (author), Baselmans, J.J.A. (author), Llombart, Nuria (author)DESHIMA is a spectrometer for astronomical applications targeting sources at sub-mm wavelengths from 240GHz to 720GHz that will operate in the ASTE telescope in Atacama Desert, Chile. In this work, a quasi-optical system based on a hyper-hemispherical leaky lens antenna and a series of Dragonian reflectors is presented as the coupling chain...conference paper 2019
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Pascual Laguna, A. (author), Karatsu, K. (author), Neto, A. (author), Endo, A. (author), Baselmans, J.J.A. (author)The design of an octave bandwidth sub-mm wave superconducting on-chip filter-bank spectrometer for Astronomy is presented. An array of THz band-pass filters subdivides the bandwidth 220-440 GHz into channels with a spectral resolution of 400 and an average maximum coupling strength f/ Delta {f} of 40%. The filter-bank performance is assessed...conference paper 2019
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Garufo, A. (author), Sberna, P.M. (author), Carluccio, G. (author), Freeman, Joshua R. (author), Bacon, David R. (author), Li, Lianhe (author), Baselmans, J.J.A. (author), Llombart, Nuria (author), Neto, A. (author)A pulsed photoconductive terahertz (THz) source is presented that is able to radiate milliwatt (mW) level average power over a large bandwidth, by exploiting both the optical and electrical properties of photoconductive sources and the ultrawideband properties of connected antenna arrays. An optical system composed of a microlenses array...journal article 2019