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Vallés-Sanclemente, S. (author), van der Meer, S.L.M. (author), Finkel, M. (author), Muthusubramanian, N. (author), Beekman, M. (author), Ali, H. (author), Marques, J.F. (author), Zachariadis, C. (author), Veen, H.M. (author), Stavenga, T. (author), Haider, N. (author), DiCarlo, L. (author)We present the use of a set of airbridges to trim the frequency of microwave coplanar-waveguide (CPW) resonators post-fabrication. This method is compatible with the fabrication steps of conventional CPW airbridges and crossovers and increases device yield by allowing compensation of design and fabrication uncertainty with 100 MHz range and 10...article 2023
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- Buendia, V.G. (author), Rodriguez, A.A. (author), Alrushud, K. (author), Podilchak, S.K. (author) conference paper 2022
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Nunez, J. (author), Koldeweij, R. (author), Trimboli, J. (author), Boersma, A. (author)In this work, a particulate matter (PM) sensor based on infrared spectroscopy is presented and evaluated for its use in occupational exposure. The technology is able to chemically identify the components of aerosols and provide quantitative information about the presence of crystalline silica, which is widely considered to be a health concern at...conference paper 2021
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Alrushud, K.M. (author), Gomez-Guillamon Buendia, V.A. (author), Podilchak, S.K. (author)A planar quasi-endfire surface-wave antenna (SWA) using substrate integrated waveguide (SIW) technology for integration with CubeSats and other small satellites is proposed in this letter. This antenna can be attached to the body of the satellite, resulting in a compact and low-cost design. A quasi-endfire beam pattern is achieved by the...article 2021
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Galeotti, F. (author), Seršić Vollenbroek, I. (author), Petruzzella, M. (author), Pagliano, F. (author), van Otten, F.W.M. (author), Zobenica, Aa. (author), Mohtashami, A. (author), Sadeghian Marnani, H. (author), van der Heijden, R.W. (author), Fiore, A. (author)Miniaturization of displacement sensors for nanoscale metrology is a key requirement in many applications such as accelerometry, mass sensing, and atomic force microscopy. While optics provides high resolution and bandwidth, integration of sensor readout is required to achieve low-cost, compact, and parallelizable devices. Here, we present a...article 2020
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Nunez, J. (author), Wang, Y. (author), Bäumer, S.M.B. (author), Boersma, A. (author)The health and environmental effects of particulate matter (PM) in the air depend on several parameters. Besides particle size, shape, and concentration, the chemical nature of the PM is also of great importance. State-of-the-art PM sensors only detect the particle size and concentration. Small, low-cost sensors only identify PM according to PM2...article 2020
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Stoevelaar, L.P. (author), Cernigoj, J. (author), Berzinš, J. (author), Silvestri, F. (author), Gerini, G. (author)In this paper, an all-dielectric metasurface for surface enhanced Raman spectroscopy (SERS) is presented. The proposed design constitutes of an array of silicon (Si) dimers on top of thin film of silicon nitride (SiN), deposited on a glass substrate. The coupling mechanism between the dimers is based on two orthogonal guided waves in the SiN...conference paper 2019
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Keizer, W.P.M.N. (author)This paper deals with the synthesis of monopulse antenna patterns, sum and difference ones, for planar phased array antennas with an elliptical aperture boundary featuring unequal ultra-low peak sidelobe levels (PSLLs) for the two principal planes of its far field. The used synthesis method is the iterative Fourier transform (IFT) approach. The...article 2019
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Kroll, J.G. (author), Borsoi, F. (author), van der Enden, K.L. (author), Uilhoorn, W. (author), de Jong, D. (author), Quintero-Perez, M. (author), van Woerkom, D.J. (author), Bruno, A. (author), Plissard, S.R. (author), Car, D. (author), Bakkers, E.P.A.M. (author), Cassidy, M.C. (author), Kouwenhoven, L.P. (author)Superconducting coplanar-waveguide resonators that can operate in strong magnetic fields are important tools for a variety of high-frequency superconducting devices. Magnetic fields degrade resonator performance by creating Abrikosov vortices that cause resistive losses and frequency fluctuations or suppress the superconductivity entirely. To...article 2019
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Prior, M.K. (author), Jansen, H.W. (author)A modelling approach is described in which time-domain underwater-acoustic source functions are generated using a model that predicts the motion of air-bubbles generated by mini-airguns operated at various pressures. These time-series are Fourier-transformed to produce frequency-domain descriptions of the source. These are combined with complex...conference paper 2018
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Bekers, D.J. (author), Jacobs, S. (author), Bolt, R.J. (author), Monni, S. (author), Fortini, D. (author), Germani, C. (author), Capece, P. (author), Toso, G. (author)In this paper a novel sparse layout for the radiating aperture of a Ka-band spaceborne SAR is outlined. Starting from a set of typical requirements and the definition of a benchmark antenna, an approach to achieve sparsity (in terms of the number of active modules) is proposed, which reduces significantly the fill factor as compared to the...conference paper 2017
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Heaney, K.D. (author), Prior, M. (author), Campbell, R.L. (author)The ocean is nearly transparent to low frequency sound permitting the observation of distant events such as earthquakes or explosions at fully basin scales. For very low frequency the ocean acts as a shallow-water waveguide and lateral variability in bathymetry can lead to out-of-plane effects. In this paper, data from the International...article 2017
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- Faber, A.J. (author), Cheng, L.K. (author), Gielesen, W.L.M. (author), Boussard-Plédel, C. (author), Maurugeon, S. (author), Bureau, B. (author), Zhang, X.H. (author), Lucas, J. (author), Pereira Do Carmo, J. (author) conference paper 2017
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Faber, A.J. (author), Cheng, L.K. (author), Gielesen, W.L.M. (author), Boussard-Plédel, C. (author), Houizot, P. (author), Danto, S. (author), Lucas, J. (author), Pereira Do Carmo, J. (author)The development of single mode chalcogenide glass fibers as wavefront filter for the DARWIN mission is reported. Melting procedures and different preform techniques for manufacturing core-cladding chalcogenide fibers are described. Bulk glass samples on the basis of Te-As-Se- and high Te-compositions have been characterized optically, by...conference paper 2017
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- Ainslie, M.A. (author), Ellis, D.D. (author) article 2017
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Bosman, E. (author), van Steenberge, G. (author), Boersma, A. (author), Wiegersma, S. (author), Harmsma, P.J. (author), Karppinen, M. (author), Korhonen, T. (author), Offrein, B.J. (author), Dangel, R. (author), Daly, A. (author), Ortsiefer, M. (author), Justice, J. (author), Corbett, B. (author), Dorrestein, S. (author), Duis, J. (author)A novel method for fabricating a single mode optical interconnection platform is presented. The method comprises the miniaturized assembly of optoelectronic single dies, the scalable fabrication of polymer single mode waveguides and the coupling to glass fiber arrays providing the I/O's. The low cost approach for the polymer waveguide...conference paper 2016
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Tang, Y. (author), Xi, Z. (author), Xu, M. (author), Bäumer, S.M.B. (author), Adam, A.J.L. (author), Urbach, H.P. (author)Hyperbolic metamaterials (HMMs) are anisotropic materials with a permittivity tensor that has both positive and negative eigenvalues. Here we report that by using a type II HMM as a cladding material, a waveguide that only supports higher-order modes can be achieved, while the lower-order modes become leaky and are absorbed in the HMM cladding....article 2016
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Justice, J. (author), Khan, U. (author), Korhonen, T. (author), Boersma, A. (author), Wiegersma, S. (author), Karppinen, M. (author), Corbett, B. (author)In the Information and Communications Technology (ICT) sector, the demands on bandwidth continually grow due to increased microprocessor performance and the need to access ever increasing amounts of stored data. The introduction of optical data transmission (e.g. glass fiber) to replace electronic transmission (e.g. copper wire) has alleviated...conference paper 2015
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Khan, M.U. (author), Justice, J. (author), Petäjä, J. (author), Korhonen, T. (author), Boersma, A. (author), Wiegersma, S. (author), Karppinen, M. (author), Corbett, B. (author)Single and multi-layer passive optical interconnects using single mode polymer waveguides are demonstrated using UV nano-imprint lithography. The fabrication tolerances associated with imprint lithography are investigated and we show a way to experimentally quantify a small variation in index contrast between core and cladding of fabricated...article 2015
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Karppinen, M. (author), Salminen, N. (author), Korhonen, T. (author), Alajoki, T. (author), Petäjä, J. (author), Bosman, E. (author), van Steenberge, G. (author), Justice, J. (author), Khan, U. (author), Corbett, B. (author), Boersma, A. (author)Polymer-based integrated optics is attractive for inter-chip optical interconnection applications, for instance, for coupling photonic devices to fibers in high density packaging. In such a hybrid integration scheme, a key challenge is to achieve efficient optical coupling between the photonic chips and waveguides. With the single-mode polymer...conference paper 2015