Searched for: subject:"Nanostructures"
(1 - 20 of 46)

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Wolterink, T.A.W. (author), Buijs, R.D. (author), Gerini, G. (author), Koenderink, A.F. (author), Verhagen, E. (author)
We study how nanophotonic structures can be used for determining the position of a nearby nanoscale object with subwavelength accuracy. Through perturbing the near-field environment of a metasurface transducer consisting of nano-apertures in a metallic film, the location of the nanoscale object is transduced into the transducer’s far-field...
article 2021
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Buijs, R.D. (author), Wolterink, T.A.W. (author), Gerini, G. (author), Verhagen, E. (author), Koenderink, A.F. (author)
Control of optical fields at the nanoscale holds the promise of fast, efficient imaging methods, but is elusive due to the diffraction limit. This paper investigates how a single metasurface patch in the near field of a sample plane may be used to create a wide variety of intensity patterns by applying different illumination profiles from the...
article 2021
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Krystek, P. (author), Shandilya, N. (author), Fransman, W. (author)
Driven by the concept of the ‘four generations of nanomaterials’, the current state of the knowledge on risk assessment of future generation is explored for active nanomaterials. Through case studies, we identify challenges and evaluate the preparedness of characterization methods, available risk assessment modeling tools, and analytical...
article 2021
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Berzins, J. (author), Indrisiūnas, S. (author), van Erve, K. (author), Nagarajan, A. (author), Fasold, S. (author), Steinert, M. (author), Gerini, G. (author), Gecys, P. (author), Pertsch, T. (author), Bäumer, S.M.B. (author), Setzpfandt, F. (author)
article 2020
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Franken, R. (author), Heringa, M.B. (author), Oosterwijk, T. (author), dal Maso, M. (author), Fransman, W. (author), Kanerva, T. (author), Liguori, B. (author), Poikkimäki, M. (author), Rodriguez-Llopis, I. (author), Säämänen, A. (author), Stockmann-Juvala, H. (author), Suarez-Merino, B. (author), alstrup Jensen, K. (author), Stierum, R. (author)
The current work describes the interaction with various stakeholder groups to establish consensus on stage-gate specific criteria that human risk assessment (HRA) models for manufactured nanomaterials (MN) need to comply with. During the decisive steps in the innovation process, which can be described in a simplified way as stage-gates, it is...
article 2020
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Buijs, R.D. (author), Schilder, N.J. (author), Wolterink, T.A.W. (author), Gerini, G. (author), Verhagen, E. (author), Koenderink, A.F. (author)
Super-resolution imaging is often viewed in terms of engineering narrow point spread functions, but nanoscale optical metrology can be performed without real-space imaging altogether. In this paper, we investigate how partial knowledge of scattering nanostructures enables extraction of nanoscale spatial information from far-field radiation...
article 2020
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Berzins, J. (author), Fasold, S. (author), Pertsch, T. (author), Bäumer, S.M.B. (author), Setzpfandt, F. (author)
Digital color imaging relies on spectral filters on top of a pixelated sensor, such as a CMOS image sensor. An important parameter of imaging devices is their resolution, which depends on the size of the pixels. For many applications, a high resolution is desirable, consequently requiring small spectral filters. Dielectric nanostructures, due to...
article 2019
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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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Pizzol, L. (author), Hristozov, D. (author), Zabeo, A. (author), Gianpietro, B. (author), Wohlleben, W. (author), Koivisto, A.J. (author), Jensen, K.A. (author), Fransman, W. (author), Stone, V. (author), Marcomini, A. (author)
The increasing use of engineered nanomaterials (ENMs) in nano-enabled products (NEPs) has raised societal concerns about their possible health and ecological implications. To ensure a high level of human and environmental protection it is essential to properly estimate the risks of these new materials and to develop adequate risk management...
article 2019
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Prodanov, D. (author), Belde, P. (author), Geerts, L. (author), L'Allain, C. (author), Feber, M.L. (author), Moclair, F. (author), Morelli, A. (author), Roquet, P. (author)
Safety of engineered nanomaterials is a new scientific field, which draws increasing attention in the literature. Among the challenges the field is facing are the insufficient amount and quality of nanotoxicological data and the ambiguity in the metrics describing the exposure. This results in substantial difficulties in the actual...
conference paper 2019
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Berzins, J. (author), Silvestri, F. (author), Gerini, G. (author), Setzpfandt, F. (author), Pertsch, T. (author), Bäumer, S.M.B. (author)
Digital imaging has been steadily improving over the past decades and we are moving towards a wide use of multi- and hyperspectral cameras. A key component of such imaging systems are color filter arrays, which define the spectrum of light detected by each camera pixel. Hence, it is essential to develop a variable, robust and scalable way for...
conference paper 2018
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Ciammaruchi, L. (author), Oliveira, R. (author), Charas, A. (author), von Hauff, E. (author), Polino, G. (author), Brunetti, F. (author), Hansson, R. (author), Moons, E. (author), Krassas, M. (author), Kakavelakis, G. (author), Kymakis, E. (author), Sánchez, J.G. (author), Ferre-Borrull, J. (author), Marsal, L.F. (author), Züfle, S. (author), Fluhr, D. (author), Roesch, R. (author), Faber, T. (author), Schubert, U.S. (author), Hoppe, H. (author), Bakker, N.J. (author), Veenstra, S.C. (author), Zanotti, G. (author), Katz, E.A. (author), Apilo, P. (author), Romero, B. (author), Tumay, T.A. (author), Parlak, E. (author), Stagno, L.M. (author), Turkovic, V. (author), Rubahn, H.G. (author), Madsen, M. (author), Kažukauskas, V. (author), Tanenbaum, D.M. (author), Shanmugam, S. (author), Galagan, Y. (author)
This work is part of the interlaboratory collaboration to study the stability of organic solar cells containing PCDTBT polymer as a donor material. The varieties of the OPV devices with different device architectures, electrode materials, encapsulation, and device dimensions were prepared by seven research laboratories. Sets of identical devices...
article 2018
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Fonseca, A.S. (author), Kuijpers, E. (author), Kling, K.I. (author), Levin, M. (author), Koivisto, A.J. (author), Nielsen, S.H. (author), Fransman, W. (author), Fedutik, Y. (author), Jensen, K.A. (author), Koponen, I.K. (author)
Fume hoods are one of the most common types of equipment applied to reduce the potential of particle exposure in laboratory environments. A number of previous studies have shown particle release during work with nanomaterials under fume hoods. Here, we assessed laboratory workers’ inhalation exposure during synthesis and handling of CuO, TiO2...
article 2018
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Koivisto, A.J. (author), Kling, K.I. (author), Fonseca, A.S. (author), Brostrøm Bluhme, A. (author), Moreman, M. (author), Yu, M. (author), Costa, A.L. (author), Giovanni, B. (author), Ortelli, S. (author), Fransman, W. (author), Vogel, U. (author), Jensen, K.A. (author)
Nanoscale TiO2 (nTiO2) is manufactured in high volumes and is of potential concern in occupational health. Here, we measured workers exposure levels while ceramic honeycombs were dip coated with liquid photoactive nanoparticle suspension and dried with an air blade. The measured nTiO2 concentration levels were used to assess process specific...
article 2018
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van Es, M.H. (author), Mohtashami, A. (author), van Neer, P.L.M.J. (author), Sadeghian Marnani, H. (author)
Imaging of nanoscale structures buried in a covering material is an extremely challenging task, but is also considered extremely important in a wide variety of fields. From fundamental research into the way living cells are built up to process control in semiconductor manufacturing would all benefit from the capability to image nanoscale...
article 2018
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Shandilya, N. (author), Ligthart, T. (author), van Voorde, I. (author), Stahlmecke, B. (author), Clavaguera, S. (author), Philippot, C. (author), Goede, H. (author)
The shredding of waste of electrical and electronic equipment (WEEE) and other products, incorporated with nanomaterials, can lead to a substantial release of nanomaterials. Considering the uncertainty, complexity, and scarcity of experimental data on release, we present the development of a Bayesian belief network (BBN) model. This baseline...
article 2018
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Hobbs, C. (author), Jaskaniec, S. (author), McCarthy, E.K. (author), Downing, C. (author), Opelt, K. (author), Güth, K. (author), Shmeliov, A. (author), Mourad, M.C.D. (author), Mandel, K. (author), Nicolosi, V. (author)
A comprehensive nanoscale understanding of layered double hydroxide thermal evolution is critical for their current and future applications as catalysts, flame retardants and oxygen evolution performers. In this report, we applied in situ transmission electron microscopy to extensively characterise the thermal progressions of nickel-iron...
article 2018
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Yang, G. (author), Guo, P. (author), Procel, P. (author), Weber, A.W. (author), Isabella, O. (author)
The poly-Si carrier-selective passivating contacts (CSPCs) parasitically absorb a substantial amount of light, especially in the form of free carrier absorption. To minimize these losses, we developed CSPCs based on oxygen-alloyed poly-Si (poly-SiOx) and deployed them in c-Si solar cells. Transmission electron microscopy analysis indicates the...
article 2018
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Xiong, K. (author), Tordera, D. (author), Emilsson, G. (author), Olsson, O. (author), Linderhed, U. (author), Jonsson, M.P. (author), Dahlin, A.B. (author)
Plasmonic color generation offers several advantages but is also limited by the cost and availability of noble metals like gold. In this work, we present color-tunable metasurfaces with high chromaticity and reflectivity consisting of an aluminum mirror, a dielectric spacer, and a plasmonic nanohole array in copper. Copper is shown to be an...
article 2017
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Kuijpers, E. (author), Bekker, C. (author), Brouwer, D. (author), le Feber, M. (author), Fransman, W. (author)
Exposure assessment for nano-objects, and their aggregates and agglomerates (NOAA), has evolved from explorative research toward more comprehensive exposure assessment, providing data to further develop currently used conservative control banding (CB) tools for risk assessment. This study aims to provide an overview of current knowledge on...
article 2017
Searched for: subject:"Nanostructures"
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