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Zhang, H. (author), Llombart, Nuria (author), Bueno Lopez, J. (author), Freni, Angelo (author)Photoconductive antennas (PCAs) are promising candidates for sensing and imaging applications. In recent years, our group has investigated their properties under pulsed laser illumination in transmission using a time-domain (TD) Norton equivalent circuit. Here, we extend this analysis to the link between a photoconductive source and a...journal article 2024
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Bueno Lopez, J. (author), Sberna, P.M. (author), Fiorellini Bernardis, A. (author), Zhang, H. (author), Neto, A. (author), Llombart, Nuria (author)State-of-the-art THz pulsed commercial systems operating over large bandwidth suffer from high dispersion or low radiation efficiency due to the poor coupling between the transmitter and receiver photoconductive antennas (PCAs). In this work, we present the fabrication and characterization of a leaky-lens PCA that has the potential to solve...journal article 2023
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Fiorellini Bernardis, A. (author), Sberna, P.M. (author), Bueno Lopez, J. (author), Zhang, H. (author), Llombart, Nuria (author), Neto, A. (author)Drude's description of the response of low-temperature gallium arsenide to optical pulse excitation is used to evaluate the components of a time-domain Norton equivalent circuit of a photoconductive antenna (PCA) source. The saturation of the terahertz (THz) radiated power occurring at large optical excitation levels was previously associated...journal article 2023
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De Martino, C. (author), Bueno Lopez, J. (author), Spirito, M. (author)In this paper, we present an experimental strategy to analyze the harmonic content of mm-wave frequency extenders using the VNA (absolute) power calibration step, without requiring spectrum analyzers and/or separate downconverters. The spectral purity of the upconverted band of the extenders is a key requirement to enable entirely software-based...conference paper 2023
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van Rooijen, N. (author), Alonso Del Pino, M. (author), Bueno Lopez, J. (author), Spirito, M. (author), Llombart, Nuria (author)This contribution presents the development of an electrically small lens antenna using an artificially loaded thermoplastic at 140-170GHz. We will present the on-going development of the Fly’s Eye front end antenna concept that was presented in [1]. The antenna is composed on a dual plastic lens, a core lens and a shell lens, fed by a double...conference paper 2023
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Huiskes, M.D. (author), Bueno Lopez, J. (author), Llombart, Nuria (author), Neto, A. (author)Photoconductive antennas (PCAs) are used for imaging and sensing applications because of their ability to radiate short pulses with large bandwidths in the THz regime. The characterization of PCAs has previously been done using a time-domain Norton equivalent circuit. Thanks to a recent contribution, the size of the excited photoconductive area...conference paper 2023
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Zhang, H. (author), Bueno Lopez, J. (author), Sberna, P.M. (author), Llombart, Nuria (author), Neto, A. (author)Photoconductive antennas (PCAs) are promising candidates for sensing and imaging systems. We have investigated their properties under pulsed laser illumination both in transmission and reception. First, a transmitting PCA has been characterized including a power measurement. Then, a Quasi-Optical (QO) link between a transmitter and a receiver...conference paper 2023
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Bueno Lopez, J. (author), Huiskes, M. (author), Zhang, H. (author), Sberna, P.M. (author), Llombart, Nuria (author), Neto, A. (author)Photoconductive antennas are devices that provide power up to THz frequencies at a relatively low cost. However, the power radiated by each antenna is typically quite low and arrays have been proposed to increase it. In this paper we present the design of a leaky enhanced array architecture that surpasses the state of the art as it operates...conference paper 2022
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Bueno Lopez, J. (author), Bosma, S. (author), Bußkamp-Alda, T. (author), Alonso Del Pino, M. (author), Llombart, Nuria (author)We present the design, fabrication and characterization of a broadband lossless matching layer for shallow lens arrays. The matching layer we propose is based on silicon pyramids fabricated on top of the lens array by means of laser ablation. This matching layer has the advantage that it covers over an octave of bandwidth. We have compared the...conference paper 2022
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Baselmans, J.J.A. (author), Endo, A. (author), Karatsu, K. (author), Hähnle, S. (author), Pascual Laguna, A. (author), Yates, S. (author), Ferrari, L. (author), Llombart, Nuria (author), Bueno Lopez, J. (author), Facchi, F. (author), Thoen, David (author), Murugesan, V. (author), van der werf, P. (author), de Visser, P.J. (author)Advances in far infrared astronomy have been, and will be, defined by instrument capabilities. Especially relevant is the development of imaging spectrometers for the wavelength range of 0.03-3 mm, which are not available at all at this moment. We will discuss recent advances in this field: First, we discuss the development of miniature on-chip...conference paper 2022
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Pascual Laguna, A. (author), Bueno Lopez, J. (author), Yates, S.J.C. (author), Ferrari, Lorenza (author), Murugesan, Vignesh (author), Thoen, David (author), Dabironezare, Shahab Oddin (author), Zhang, H. (author), Llombart, Nuria (author), Baselmans, J.J.A. (author)A focal plane array of extended-hemispherical silicon lenses coupled to aluminum coplanar-waveguide (CPW) Microwave Kinetic Inductance Detectors (MKIDs) has been designed to operate at 7.8 THz. Low-dispersive leaky-wave radiation has been used to efficiently illuminate the antireflection-coated lenses. To minimize the radiation loss from the...conference paper 2022
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Alonso Del Pino, M. (author), Bosma, S. (author), Jung-Kubiak, C. (author), Bueno Lopez, J. (author), Chattopadhyay, G. (author), Llombart, Nuria (author)A novel transmit lens array is proposed to provide broadband quasi-optical power distribution and beam-steering capabilities for array architectures in future submillimeter-wave heterodyne instruments. The transmit array is composed of a double array layer of lens antenna elements with high aperture efficiency. To enable broadband and low loss...conference paper 2022
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Baselmans, J.J.A. (author), Karatsu, K. (author), Llombart, Nuria (author), Rybak, M. (author), Bueno Lopez, J. (author), Buijtendorp, B.T. (author), Dabironezare, Shahab Oddin (author), Hähnle, S.A. (author), Pascual Laguna, A. (author), Thoen, David (author), Yates, S.J.C. (author), Endo, A. (author)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...journal article 2022
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Bueno Lopez, J. (author), Bosma, S. (author), Bußkamp-Alda, Tobias (author), Alonso Del Pino, M. (author), Llombart, Nuria (author)We present the design, fabrication and characterization of a broadband lossless matching layer for silicon lens arrays. The proposed matching layer is based on silicon frusta (truncated pyramids) on top of the lens array fabricated by means of laser ablation. This matching layer is advantageous over quarter-wavelength dielectric matching...journal article 2022
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Fiorellini Bernardis, A. (author), Zhang, H. (author), Sberna, P.M. (author), Bueno Lopez, J. (author), Neto, A. (author), Llombart, Nuria (author)The time evolution of voltages and currents in a pulsed photo conductive antenna (PCA) source is evaluated resorting to a rigorous procedure that stems from semiconductor physics first, to define the phenomena involved in the generation of the photocurrent, and then relies on an equivalent circuit in time domain, providing a direct estimation...abstract 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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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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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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Karatsu, K. (author), Endo, A. (author), Bueno Lopez, J. (author), de Visser, P.J. (author), Barends, R. (author), Thoen, David (author), Murugesan, V. (author), Tomita, T. (author), Baselmans, J.J.A. (author)For space observatories, the glitches caused by high energy phonons created by the interaction of cosmic ray particles with a detector substrate lead to dead time during observation. Mitigating the impact of cosmic rays is therefore an important requirement for detectors to be used in future space missions. In order to investigate possible...journal article 2019
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Yurduseven, O. (author), Bueno Lopez, J. (author), Yates, Stephen (author), Neto, A. (author), Baselmans, J.J.A. (author), Llombart, Nuria (author)There is an increasing demand for large format detector arrays with large bandwidths and high antenna efficiencies for future THz astronomical radiometric applications. For direct detection instruments, it is also desired to have antennas with dual polarization reception in order to increase the received power from incoherent sources, thereby...journal article 2018
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