Searched for: author%3A%22B%C3%A4umer%2C+S.M.B.%22
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Caron, J.F. (author), Bäumer, S.M.B. (author)
The aberrations of reflective optical systems with one plane of symmetry are investigated in the most general case, with freeform surfaces and possibly different locations of the tangential and sagittal object and image. In this first paper in a series of two, we establish generalized ray-tracing equations including transverse aberrations up to...
article 2021
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Caron, J.F. (author), Bäumer, S.M.B. (author)
The aberrations of reflective optical systems with planar symmetry are investigated in the most general case, with freeform surfaces and possibly different locations of the tangential and sagittal object and image. In this second and last paper, closed-form expressions are derived for the aberrations created by an individual mirror. We study two...
article 2021
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Caron, J.F. (author), Ceccotti, T. (author), Bäumer, S.M.B. (author)
In this invited paper, a simple and efficient matrix formalism is presented for computing aberrations in plane-parallel freeform mirror systems. The approach is flexible and can be easily generalized to arbitrary aberration orders and/or to systems with different symmetries. As an illustration, we derive analytical expressions for all second-...
conference paper 2021
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Caron, J.F. (author), Bäumer, S.M.B. (author)
Off-axis systems with freeform mirrors is a design approach of increasing importance for space instruments. While the off-axis reflective approach allows simple, versatile and obstruction free designs, the use of freeform surfaces allows to achieve better optical performance and/or compactness. In recent years, many such instruments have been...
conference paper 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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Stoevelaar, L.P. (author), Berzins, J. (author), Silvestri, F. (author), Fasold, S. (author), Zangeneh Kamali, K. (author), Knopf, H. (author), Eilenberger, F. (author), Setzpfandt, F. (author), Pertsch, T. (author), Bäumer, S.M.B. (author), Gerini, G. (author)
We present a planar spectro-polarimeter based on Fabry-Pérot cavities with embedded polarization-sensitive high-index nanostructures. A 7 μm-thick spectro-polarimetric system for 3 spectral bands and 2 linear polarization states is experimentally demonstrated. Furthermore, an optimal design is theoretically proposed, estimating that a system...
article 2020
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Berzins, J. (author), Indrisiūnas, S. (author), Fasold, S. (author), Steinert, M. (author), Zukovskaja, O. (author), Cialla-May, D. (author), Gecys, P. (author), Bäumer, S.M.B. (author), Pertsch, T. (author), Setzpfandt, F. (author)
Optically resonant high-index dielectric metasurfaces featuring Mie-type electric and magnetic resonances are usually fabricated by means of planar technologies, which limit the degrees of freedom in tunability and scalability of the fabricated systems. Therefore, we propose a complimentary post-processing technique based on ultrashort (≤ 10 ps)...
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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Boersma, A. (author), Wang, Y. (author), Bäumer, S.M.B. (author), Lucas, P. (author), Willekers, R.W. (author), Halpin, A. (author), Gomez Rivas, J. (author), Hendriks, N. (author), den Toonder, J. (author)
Stimulated Emission Depletion (STED)lithography is generally recognized as a very promising tool to overcome the Abbe diffraction limit and manufacture 3D submicron features using a mask-less lithography step. It has been shown to be able to create 100 nm resolution, 10 nm feature size features in a polymer resin. However, STED is not widely...
other 2019
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Nagarajan, A. (author), Siemons, M. (author), Stoevelaar, L.P. (author), Silvestri, F. (author), Achanta, V.G. (author), Bäumer, S.M.B. (author), Gerini, G. (author)
In this paper, we discuss the setup of a confocal nanoscope in reflection using a super-oscillatory lens (SOL)which offers a sub-diffracted focal spot with an ultra-short depth of focus (≈100 nm). A tolerance of 20 nm defocussing in a 10 μm travel range is thus necessary, translating to an alignment requirement of the stage, with respect to the...
conference paper 2019
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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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Nagarajan, A. (author), Stoevelaar, L.P. (author), Silvestri, F. (author), Siemons, M. (author), Achanta, V.G. (author), Bäumer, S.M.B. (author), Gerini, G. (author)
A superoscillatory lens (SOL) is known to produce a sub-diffraction hotspot that is useful for high-resolution imaging. SOLs have not yet been directly used in a confocal reflection setup, as the SOL suffers from poor imaging properties. Additionally, the illuminating intensity distribution of the SOL still has high-intensity rings called...
article 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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Koek, W.D. (author), Florijn, H.C.B. (author), Bäumer, S.M.B. (author), Kruidhof, R. (author), Sadeghian Marnani, H. (author)
Due to its potential for high resolution and three-dimensional imaging, soft X-ray ptychography has received interest for nanometrology applications. We have analyzed the measurement time per unit area when using soft X-ray ptychography for various nanometrology applications including mask inspection and wafer inspection, and are thus able to...
conference paper 2018
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Kruit, P. (author), de Kroon, M.G.M. (author), Maas, D.J. (author), Baumer, S.M.B. (author), Spruit, W.E.T. (author)
The field of 3D nano-structuring and metrology is advancing rapidly in the Netherlands and the rest of the world. In general, the quality of the involved investigators, knowledge institutes and companies in the Netherlands is world-class. Many Dutch academic groups / knowledge institutes / companies are world-leading in their own nano-arena. A...
report 2017
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Silvestri, F. (author), Gerini, G. (author), Bäumer, S.M.B. (author)
In the last years, much interest has grown around the concept of optical surfaces employing high contrast dielectric resonators. However, a systematic approach for the design of this optical surfaces under particular requirements has never been proposed. In this contribution, we describe this approach applied to the robust design of an array of...
conference paper 2017
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Bäumer, S.M.B. (author), Yi, A. (author)
article 2016
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Silvestri, F. (author), Gerini, G. (author), Bäumer, S.M.B. (author), van Zwet, E.J. (author)
In this paper, we present a design strategy for single layer metasurface lenses based on dielectric resonators. This strategy is based on a robust optimization procedure for the resonator distribution in order to meet required performances (e.g. encircled energy, bandwidth, field of view, etc.). Possible deviations due to manufacturing errors are...
article 2016
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Silvestri, F. (author), Bernal Arango, F. (author), Vendel, K.J.A. (author), Gerini, G. (author), Bäumer, S.M.B. (author), Koenderink, A.F. (author)
This paper presents the use of optical antennas in metrology scenarios. Two design concepts are presented: dielectric nanoresonator arrays and plasmonic nanoantennas arrays. The first ones are able to focus an incident light beam at an arbitrary focal plane. The nanoantennas arrays can be employed for collecting the high-spatial frequencies of...
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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