Searched for: author:"Stoevelaar, L.P."
(1 - 10 of 10)
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Kenworthy, C.F. (author), Stoevelaar, L.P. (author), Alexander, A.J. (author), Gerini, G. (author)
In this paper, we report the effect of optical trapping on the enhancement factor for Raman spectroscopy, using a dielectric metasurface. It was found that a higher enhancement factor (up to 275%) can be obtained in a substrate immersed in water, where particles are freee to move, compared to a dried substrate, where the particles (radius r = 9...
article 2021
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Gerini, G. (author), Stoevelaar, L.P. (author), Ceccotti, T. (author)
In this work, we present three different metamaterial based spectro-polarimetric systems. Their principles of operation and their performances are briefly discussed. A more detailed analysis of the three systems and the results of the experimental characterization of the first concept will be presented at the conference.
conference paper 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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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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Stoevelaar, L.P. (author), Gerini, G. (author)
This contribution presents the design and performance assessment of a metasurface based spectro-polarimeter concept.
other 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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Stoevelaar, L.P. (author), Gerini, G. (author)
TNO is currently performing a theoretical assessment of an optical system based on a Solid Immersion Lens (SIL). This contribution presents the theoretical approach and the modelling framework developed for this study.
other 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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Stoevelaar, L.P. (author), Gerini, G. (author)
In this paper, we present an electromagnetic full-wave modeling framework, as a support EM tool providing data sets for X-ray ptychographic imaging. Modeling the entire scattering problem with Finite Element Method (FEM) tools is, in fact, a prohibitive task, because of the large area illuminated by the beam (due to the poor focusing power at...
conference paper 2018
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Černigoj, J. (author), Silvestri, F. (author), Stoevelaar, L.P. (author), Berzinš, J. (author), Gerini, G. (author)
In this paper, we propose the use of high refractive index dimers for the realization of a surface enhanced Raman spectroscopy substrate, with an average enhancement factor comparable to plasmonic structures. The use of low loss dielectric materials is favorable to metallic ones, because of their lower light absorption and consequently a much...
article 2018
Searched for: author:"Stoevelaar, L.P."
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