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Heemels, A.N.M. (author), de Koning, B. (author), Möller, M. (author), Adam, A.J.L. (author)We propose a method for optimizing the geometry of a freeform lens to redirect the light emitted from an extended source into a desired irradiance distribution. We utilize a gradient-based optimization approach with MITSUBA 3, an algorithmic differentiable non-sequential ray tracer that allows us to obtain the gradients of the freeform...journal article 2024
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Zhu, Z. (author), Zhang, Y. (author), Min, Changjun (author), Adam, A.J.L. (author), Urbach, Paul (author), Yuan, Xiaocong (author)Optical tweezers have proved to be a powerful tool with a wide range of applications. The gradient force plays a vital role in the stable optical trapping of nano-objects. The scalar method is convenient and effective for analyzing the gradient force in traditional optical trapping. However, when the third-order nonlinear effect of the nano...journal article 2024
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Zhu, Z. (author), Zhang, Yu Quan (author), Adam, A.J.L. (author), Min, Changjun (author), Urbach, Paul (author), Yuan, Xiaocong (author)Stable optical trapping of gold nanoparticles is essential and desirable because of its wide applications in nanotechnology. While several factors have been proposed to affect optical trapping stability, the sample's volume fraction during optical trapping has often been neglected. To address this, by utilizing the effective medium theory, we...journal article 2023
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Heemels, A.N.M. (author), Adam, A.J.L. (author), Urbach, Paul (author)When redistributing the light emitted by a source into a prescribed irradiance distribution, it is not guaranteed that, given the source and optical constraints, the desired irradiance distribution can be achieved.We analyze the problem by assuming an optical black box that is shift-invariant, meaning that a change in source position does not...journal article 2023
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de Koning, B. (author), Heemels, A.N.M. (author), Adam, A.J.L. (author), Möller, M. (author)Algorithmic differentiable ray tracing is a new paradigm that allows one to solve the forward problem of how light propagates through an optical system while obtaining gradients of the simulation results with respect to parameters specifying the optical system. Specifically, the use of algorithmically differentiable non-sequential ray tracing...journal article 2023
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Zhu, Z. (author), Zhang, Y. (author), Zhang, Shuoshuo (author), Adam, A.J.L. (author), Min, Changjun (author), Urbach, Paul (author), Yuan, Xiaocong (author)Nonlinear responses of nanoparticles induce enlightening phenomena in optical tweezers. With the gradual increase in optical intensity, effects from saturable absorption (SA) and reverse SA (RSA) arise in sequence and thereby modulate the nonlinear properties of materials. In current nonlinear optical traps, however, the underlying physical...journal article 2023
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Nandakumar, Sangeetha (author), Eggl, Siegfried (author), Tregloan-Reed, Jeremy (author), Adam, Christian (author), Anderson-Baldwin, Jasmine (author), Bannister, Michele T. (author), Battle, Adam (author), Benkhaldoun, Zouhair (author), Langbroek, M. (author)Large constellations of bright artificial satellites in low Earth orbit pose significant challenges to ground-based astronomy <sup>1</sup>. Current orbiting constellation satellites have brightnesses between apparent magnitudes 4 and 6, whereas in the near-infrared Ks band, they can reach magnitude 2 (ref. <sup>2</sup>). Satellite operators,...journal article 2023
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Rates, Alfredo (author), Lagendijk, Ad (author), Adam, A.J.L. (author), IJzerman, Wilbert L. (author), Vos, Willem L. (author)Wavefront shaping is a technique to study and control light transport inside scattering media. Wavefront shaping is considered to be applicable to any complex material, yet in most previous studies, the only sample geometries that are studied are slabs or wave-guides. In this paper, we study how macroscopic changes in the sample shape affect...journal article 2023
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Rates, Alfredo (author), Adam, A.J.L. (author), IJzerman, Wilbert L. (author), Lagendijk, Ad (author), Vos, Willem L. (author)In most previous studies about light scattering, no geometry is used besides a slab. In this work, we study how macroscopic changes in the geometry affects light scattering using the Wavefront Shaping technique.journal article 2022
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Grillo Peternella, F. (author), Harmsma, Peter (author), Horsten, R.C. (author), Zuidwijk, T. (author), Urbach, Paul (author), Adam, A.J.L. (author)A new method for fast, high resolution interrogation of an array of photonic sensors is proposed. The technique is based on the integrated Fourier transform (FT) interrogator previously introduced by the authors. Compared to other interferometric interrogators, the FT-interrogator is very compact and has an unprecedented tolerance to...journal article 2021
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De Haan, Guido (author), Verrina, Vanessa (author), Adam, A.J.L. (author), Zhang, Hao (author), Planken, Paul C.M. (author)In this paper, we report on surface-plasmon-resonance enhancement of the time-dependent reflection changes caused by laser-induced acoustic waves.We measure an enhancement of the reflection changes induced by several acoustical modes, such as longitudinal, quasi-normal, and surface acoustic waves, by a factor of 10-20.We show that the...journal article 2021
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Chien, M.P. (author), Brinks, D. (author), Testa-Silva, Guilherme (author), Tian, He (author), Brooks, F. Phil (author), Adam, Yoav (author), Bloxham, William (author), Gmeiner, Benjamin (author), Kheifets, Simon (author), Cohen, A.E. (author)Photoactivated genetically encoded voltage indicators (GEVIs) have the potential to enable optically sectioned voltage imaging at the intersection of a photoactivation beam and an imaging beam. We developed a pooled high-throughput screen to identify archaerhodopsin mutants with enhanced photoactivation. After screening ~10<sup>5</sup> cells,...journal article 2021
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Tang, Y. (author), Ha, S. (author), Begou, Thomas (author), Lumeau, Julien (author), Urbach, Paul (author), Dekker, N.H. (author), Adam, A.J.L. (author)The ability to apply force and torque directly to micro- and nanoscale particles in optical traps has a wide range of applications. While full control of both force and torque in three dimensions has been realized using top-down fabrication of rod-shaped particles composed of birefringent crystalline materials, widespread usage of such...journal article 2020
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Adam, Florian (author), Terra, W. (author), Sciacchitano, A. (author)Large-scale particle image velocimetry (PIV) is used to characterize the dynamics of the unsteady wake of a non-pedalling full-scale cyclist. This to provide better understanding of the flow structures that generate the aerodynamic drag. Instantaneous flow fields are acquired and averaged to obtain the time-average flow topology. Afterwards,...journal article 2019
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Ha, S. (author), Tang, Y. (author), van Oene, M.M. (author), Janissen, R. (author), Dries, R.M. (author), Solano Hermosilla, B.P. (author), Adam, A.J.L. (author), Dekker, N.H. (author)Optical trapping of (sub)micron-sized particles is broadly employed in nanoscience and engineering. The materials commonly employed for these particles, however, have physical properties that limit the transfer of linear or angular momentum (or both). This reduces the magnitude of forces and torques, and the spatiotemporal resolution,...journal article 2019
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Grillo Peternella, F. (author), Esselink, Thomas (author), Dorsman, S.A. (author), Harmsma, Peter (author), Horsten, R.C. (author), Zuidwijk, T. (author), Urbach, Paul (author), Adam, A.J.L. (author)In this paper, the design and the characterization of a novel interrogator based on integrated Fourier transform (FT) spectroscopy is presented. To the best of our knowledge, this is the first integrated FT spectrometer used for the interrogation of photonic sensors. It consists of a planar spatial heterodyne spectrometer, which is...journal article 2019
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Adam, A.J.L. (author)An ambitious project teams up local photonics organizations with creative facilities to promote European photonics innovation.journal article 2018
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Dingemans, LM (author), Papadakis, V. (author), Liu, P. (author), Adam, A.J.L. (author), Groves, R.M. (author)Background<br/>Hyperspectral imaging is a technique that enables the mapping of spectral signatures across a surface. It is most commonly used for surface chemical mapping in fields as diverse as satellite remote sensing, biomedical imaging and heritage science. Existing models, such as the Kubelka-Munk theory and the Lambert-Beer law also...journal article 2017
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Wandinger, U. (author), Freudenthaler, V. (author), Baars, H. (author), Amodeo, A. (author), Engelmann, R. (author), Mattis, I. (author), Gross, S. (author), Pappalardo, G. (author), Giunta, G. (author), D'Amico, G. (author), Chaikovsky, A. (author), Osipenko, F. (author), Slesar, A. (author), Nicolae, D. (author), Belegante, L. (author), Talianu, C. (author), Serikov, I. (author), Linne, H. (author), Jansen, F. (author), Apituley, A. (author), Wilson, K.M. (author), de Graaf, M. (author), Trickl, T. (author), Giehl, H. (author), Adam, D. (author), Comeron, A. (author), Munoz-Porcar, C. (author), Rocadenbosch, F. (author), Sicard, M. (author), Tomas, S. (author), de Lange, D. (author), Kumar, D. (author), Pujadas, M. (author), Molero, F. (author), Fernandez, A.F. (author), Alados-Arboledas, L. (author), Bravo-Aranda, J.A. (author), Navas-Guzman, F. (author), Guerrero-Rascado, J.L. (author), Granados-Munoz, M.J. (author), Preissler, J. (author), Wagner, F. (author), Gausa, M. (author), Grigorov, I. (author), Stoyanov, D. (author), Iarlori, M. (author), Rizi, V. (author), Spinelli, N. (author), Boselli, A. (author), Wang, X. (author), lo Feudo, F. (author), Perrone, M.R. (author), de Tomasi, F. (author), Burlizzi, P. (author)This paper introduces the recent European Aerosol Research Lidar Network (EARLINET) quality-assurance efforts at instrument level. Within two dedicated campaigns and five single-site intercomparison activities, 21 EARLINET systems from 18 EARLINET stations were intercompared between 2009 and 2013. A comprehensive strategy for campaign setup and...journal article 2016
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Xi, Z. (author), Wei, L. (author), Adam, A.J.L. (author), Urbach, Paul (author), Du, L (author)Identifying subwavelength objects and displacements is of crucial importance in optical nanometrology. We show in this Letter that nanoantennas with subwavelength structures can be excited precisely by incident beams with singularity. This accurate feeding beyond the diffraction limit can lead to dynamic control of the unidirectional scattering...journal article 2016