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Konijnenberg, A.P. (author), Adam, A.J.L. (author), Urbach, Paul (author)
This book treats optics at the level of students in the later stage of their bachelor or the beginning of their master. It is assumed that the student is familiar with Maxwell’s equations. Although the book takes account of the fact that optics is part of electromagnetism, special emphasis is put on the usefulness of approximate models of optics...
book 2024
document
Handula, M. (author), Beekman, Savanne (author), Konijnenberg, Mark (author), Stuurman, Debra (author), de Ridder, Corrina (author), Bruchertseifer, Frank (author), Morgenstern, Alfred (author), Denkova, A.G. (author), de Blois, Erik (author), Seimbille, Y. (author)
Background: The [<sup>177</sup>Lu]Lu-DOTA-TATE mediated peptide receptor radionuclide therapy (PRRT) of neuroendocrine tumors (NETs) is sometimes leading to treatment resistance and disease recurrence. An interesting alternative could be the somatostatin antagonist, [<sup>177</sup>Lu]Lu-DOTA-JR11, that demonstrated better biodistribution...
journal article 2023
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Ambrosini, Valentina (author), Carrilho Vaz, Sofia (author), Ahmadi Bidakhvidi, Niloefar (author), Cysouw, Matthijs C.F. (author), Serani, Francesca (author), Deroose, Christophe M. (author), de Geus-Oei, L.F. (author), Konijnenberg, Mark W. (author), Oprea Lager, Daniela E. (author)
contribution to periodical 2023
document
Konijnenberg, A.P. (author), Adam, A.J.L. (author), Urbach, Paul (author)
This book treats optics at the level of students in the later stage of their bachelor or the beginning of their master. It is assumed that the student is familiar with Maxwell’s equations. Although the book takes account of the fact that optics is part of electromagnetism, special emphasis is put on the usefulness of approximate models of optics...
book 2021
document
de Beurs, A. C.C. (author), Liu, X. (author), Jansen, G. (author), Konijnenberg, A.P. (author), Coene, W.M.J.M. (author), Eikema, K. S.E. (author), Witte, S. (author)
We report on a method that allows microscopic image reconstruction from extreme-ultraviolet diffraction patterns without the need for object support constraints or other prior knowledge about the object structure. This is achieved by introducing additional diversity through rotation of an object in a rotationally asymmetric probe beam,...
journal article 2020
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Xi, Z. (author), Konijnenberg, A.P. (author), Urbach, Paul (author)
We introduce an optimal metagrating design for transverse-position metrology in presence of photon shot noise. The proposed working principle is closely related to the formation of a phase vortex in the diffraction orders in the parameter space. Using the topological robustness, we optimize the design and compress all the transverse-position...
journal article 2020
document
Konijnenberg, A.P. (author)
In this thesis, several phase retrieval methods are discussed. Since the focus will mainly be on theory rather than experiment, the structure has been determined by the similarities and differences of the mathematics of these methods. For example, a distinction is made between non-iterative and iterative methods, and between single-shot...
doctoral thesis 2019
document
Lu, Xingyuan (author), Shao, Y. (author), Zhao, C.L. (author), Konijnenberg, A.P. (author), Zhu, Xinlei (author), Tang, Y. (author), Cai, Yangjian (author), Urbach, Paul (author)
We propose and experimentally demonstrate a noniterative diffractive imaging method for reconstructing the complex-valued transmission function of an object illuminated by spatially partially coherent light from the far-field diffraction pattern. Our method is based on a pinhole array mask, which is specially designed such that the...
journal article 2019
document
Meng, P. (author), Man, Z. (author), Konijnenberg, A.P. (author), Urbach, Paul (author)
Optical angular momenta (AM) have attracted tremendous research interest in recent years. In this paper we theoretically investigate the electromagnetic field and angular momentum properties of tightly focused arbitrary cylindrical vortex vector (CVV) input beams. An absorptive particle is placed in focused CVV fields to analyze the optical...
journal article 2019
document
Dwivedi, P. (author), Konijnenberg, A.P. (author), Pereira, S.F. (author), Meisner, J.A. (author), Urbach, Paul (author)
Ptychography is a form of coherent diffractive imaging; it employs far-field intensity patterns of the object to reconstruct the object. In ptychography, an important limiting factor for the reconstructed image quality is the uncertainty in the probe positions. Here, we propose a new approach which uses the hybrid input-output algorithm and...
journal article 2019
document
Lu, Xingyuan (author), Zhao, C.L. (author), Shao, Y. (author), Zeng, Jun (author), Konijnenberg, A.P. (author), Zhu, Xinlei (author), Popov, Sergei (author), Urbach, Paul (author), Cai, Yangjian (author)
In the theory of partial coherence, coherence singularities can occur in the spectral degree of coherence (SDOC): in case the fields at two different points are completely uncorrelated, the phase of the SDOC is undefined. For a partially coherent vortex beam, the detection of coherence singularities is linked to the measurement of topological...
journal article 2019
document
Konijnenberg, A.P. (author), Coene, W.M.J.M. (author), Urbach, Paul (author)
A noise-robust extension of iterative phase retrieval algorithms that does not need to assume a noise model is proposed. It works by adapting the intensity constraints using the reconstructed object. Using a proof-of-principle ptychographic experiment with visible light and a spatial light modulator to create an object, the proposed method is...
journal article 2018
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Shao, Y. (author), Lu, Xingyuan (author), Konijnenberg, A.P. (author), Zhao, C.L. (author), Cai, Yangjian (author), Urbach, Paul (author)
The complete characterization of spatial coherence is extremely di cult because the mutual coherence function (MCF) is a complex-valued function of four independent Cartesian coordinates. This di culty limits the ability to control and to optimize the spatial coherence in a broad range of key applications. Here we propose an e cient and...
journal article 2018
document
Konijnenberg, A.P. (author), Lu, Xingyuan (author), Liu, Leixin (author), Coene, W.M.J.M. (author), Zhao, C.L. (author), Urbach, Paul (author)
A novel non-iterative phase retrieval method is proposed and demonstrated with a<br/>proof-of-principle experiment. The method uses a fixed specially designed mask and through-focus intensity measurements. It is demonstrated that this method is robust to spatial partial coherence in the illumination, making it suitable for coherent diffractive...
journal article 2018
document
Dwivedi, P. (author), Konijnenberg, A.P. (author), Pereira, S.F. (author), Urbach, Paul (author)
Ptychography, a form of Coherent Diffractive Imaging, is used with short wavelengths (e.g. X-rays, electron beams) to achieve high-resolution image reconstructions. One of the limiting factors for the reconstruction quality is the accurate knowledge of the illumination probe positions. Recently, many advances have been made to relax the...
journal article 2018
document
Xu, Xiaosi (author), Konijnenberg, A.P. (author), Pereira, S.F. (author), Urbach, Paul (author)
Coherent Fourier scatterometry is an optical metrology technique that utilizes the measured intensity of the scattered optical field to reconstruct certain parameters of test structures written on a wafer with nano-scale accuracy. The intensity of the scattered field is recorded with a camera and this information is used to retrieve the...
journal article 2017
document
Konijnenberg, A.P. (author)
An overview of several ptychographic phase retrieval methods and the theory behind them is presented. By looking into the theory behind more basic single-intensity pattern phase retrieval methods, a theoretical framework is provided for analyzing ptychographic algorithms. Extensions of ptychographic algorithms that deal with issues such as...
journal article 2017
document
Konijnenberg, A.P. (author)
We have designed a ptychographical algorithm (HIO-PIE) in which HIO (Hybrid Input-Output) iterations are applied for each probe position sequentially. Simulations indicated that HIO-PIE tends to outperform PIE (Ptychographical Iterative Engine) even in the presence of shot noise, especially when the number of probe positions is small. Thus, this...
conference paper 2017
document
Dwivedi, P. (author), Konijnenberg, A.P. (author), Pereira, S.F. (author), Urbach, Paul (author)
For high resolution imaging, X-rays and electron beams are being used. However, for such a short wavelength, imaging with lenses becomes difficult as lenses absorb a part of radiation and lenses with very low aberrations must be used. Ptychography is a lens-less imaging technique which uses intensity information of the multiple diffraction...
conference paper 2017
document
Konijnenberg, A.P. (author), Coene, W.M.J.M. (author), Urbach, Paul (author)
We report on a novel non-iterative phase retrieval method with which the complex-valued transmission function of an object can be retrieved with a non-iterative computation, with a limited number of intensity measurements. The measurements are taken in either real space or Fourier space, and for each measurement the phase in its dual space is...
journal article 2016
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