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Losch, M.S. (author), Heintz, J.D. (author), Edström, Erik (author), Terander, Adrian Elmi (author), Dankelman, J. (author), Hendriks, B.H.W. (author)Diffuse Reflectance Spectroscopy (DRS) can provide tissue feedback for pedicle screw placement in spine surgery, yet the integration of fiber optics into the tip of the pedicle probe, a device used to pierce through bone, is challenging, since the optical probing depth and signal-to-noise ratio (SNR) are affected negatively compared to those of...journal article 2024
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Zhang, M. (author), Raghunath, Aparna (author), Zhao, A. (author), Eral, H.B. (author)On-dose authentication (ODA) enhances security by incorporating customized molecular or micro-tags into each pill, preventing counterfeit products in genuine packages. ODA's security relies on tag non-replication and non-reverse engineering. Combining ODA with graphical Physical Unclonable Functions (PUF) promises maximum security. PUF uses...journal article 2024
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Mooren, Noud (author), van Meer, Max (author), Witvoet, Gert (author), Oomen, T.A.E. (author)Actuators that require commutation algorithms, such as the switched reluctance motor (SRM) considered in this paper and employed in the coarse pointing assembly (CPA) for free-space optical communication, often have torque-ripple disturbances that are periodic in the commutation-angle domain that deteriorate the positioning performance. The...journal article 2024
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Tacx, Paul (author), Habraken, Roel (author), Witvoet, Gert (author), Heertjes, Marcel (author), Oomen, T.A.E. (author)Next-generation deformable mirrors are envisaged to exhibit low-frequency flexible dynamics and to contain a large number of spatially distributed actuators due to increasingly stringent performance requirements. The increasingly complex system characteristics necessitate identifying the flexible dynamic behavior for design validation and...journal article 2024
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Bannenberg, L.J. (author), Verhoeff, D. (author), Jonckers Newton, Nick (author), Thijs, M.A. (author), Schreuders, H. (author)Here, we study the structural and optical properties of tetragonal β-tantalum-sputtered thin films both ex situ and when exposed to hydrogen, with a focus on optical hydrogen sensing applications. Using optical transmission measurements, out-of-plane and in-plane X-ray diffraction, and X-ray and neutron reflectometry, we show that thin film β...journal article 2024
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Bajaj, V. (author), Van de Plas, Raf (author), Wahls, S. (author)While probabilistic constellation shaping (PCS) enables rate and reach adaption with finer granularity [1] (Cho and Winzer, 2009), it imposes signal processing challenges at the receiver. Since the distribution of PCS-quadrature amplitude modulation (QAM) signals tends to be Gaussian, conventional blind polarization demultiplexing algorithms...journal article 2024
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Hu, Weiya (author), Coco Martin, C.M. (author), Cavallo, D. (author)A semi-analytical method is presented for the design of gradient index (GRIN) flat lenses. Closed-form expressions are derived to define the refractive index distribution of the lens, for several cases: collimating lenses with on-axis feed, collimating lenses with off-axis feed, lenses converting spherical wavefronts with different...journal article 2024
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Rønning, K.D. (author), Tang, Y. (author)Due to good thermal conductivity and thermal shock resistance, ultra-high temperature ceramics such as zirconium diboride (ZrB2) have been investigated as promising materials to be used in reusable thermal protection systems TPSs are vital to the heat balance of a spacecraft during atmospheric reentry and subsequent operation in space. Hence,...journal article 2024
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Vilaboa Pérez, Jesús (author), Georges, Marc (author), Hastanin, Juriy (author), Loicq, J.J.D. (author)We describe the state of the development of a coherence scanning interferometer to measure local changes in topology and local induced vibrations of a mirror at cryogenic temperatures. The metrology instrument incorporates an optical phase mask and a microlenses array, enabling the acquisition of complete white light interferograms within a...journal article 2024
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Felicita, M.P. (author), Pagella, G. (author), Ravenshorst, G.J.P. (author), Mirra, M. (author), van de Kuilen, J.W.G. (author)This case study explores the utilization of distributed fiber optic sensors (DFOS) in wooden foundation piles, for assessing and monitoring the stress distribution along their length. Three spruce and three pine foundation piles instrumented with DFOS were driven into the soil in a testing field in Amsterdam and axially loaded in compression....journal article 2024
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Holthuizen, Patrick (author), Copuroglu, Oguzhan (author)Sample preparation is of utmost importance for any microscopy and microstructural analysis. Correct preparation will allow accurate interpretation of microstructural features. A well-polished section is essential when scanning electron microscopy (SEM) is used in backscattering electron (BSE) mode and characteristic X-rays are to be...journal article 2024
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Huisman, Kees Theo (author), Abdellah, Mohamed H. (author), Alvarez Sosa, Damaris S. (author), Fernandes Simoes, Filipa R. (author), Blankert, Bastiaan (author), Vrouwenvelder, J.S. (author), Szekely, Gyorgy (author)Membrane modules for seawater desalination are becoming increasingly important for obtaining clean water with the rising global water scarcity. The productivity of membrane modules is compromised by biofouling on the membrane and feed spacer. Biofouling development can be mitigated by modification of the spacer or membrane surface. The...journal article 2024
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Xiao, Y. (author), Rans, C.D. (author), Zarouchas, D. (author), Benedictus, R. (author)Embedding fiber optic sensors (FOSs) within parts for strain measurement is attracting widespread interest due to its great potential in the field of structural health monitoring (SHM). This work proposes a novel method of embedding FOSs using capillaries within solid structures and investigates fiber positions and orientation uncertainties...journal article 2023
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Shi, Rui (author), Wüthrich, D. (author), Chanson, Hubert (author)Transient motion, turbulence and bubble dynamics make any velocity quantification extremely difficult in unsteady gas–liquid flows. In the present study, novel Eulerian and Lagrangian techniques of velocimetry were developed, using both intrusive and non-intrusive measurements. The selected unsteady gas–liquid flow was a breaking bore,...journal article 2023
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Mulder, J.T. (author), Meijer, M.S. (author), van Blaaderen, J.J. (author), du Fossé, I. (author), Jenkinson, Kellie (author), Bals, Sara (author), Manna, Liberato (author), Houtepen, A.J. (author)Ytterbium-doped LiYF4 (Yb:YLF) is a commonly used material for laser applications, as a photon upconversion medium, and for optical refrigeration. As nanocrystals (NCs), the material is also of interest for biological and physical applications. Unfortunately, as with most phosphors, with the reduction in size comes a large reduction of the...journal article 2023
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Bannenberg, L.J. (author)Here, a method to suppress drift in intensity-modulated sensors is presented that preserves the advantages of such sensors including simplicity and low-cost components. This method is illustrated using metal hydride-based optical hydrogen sensors that can reliably, accurately, and quickly sense hydrogen across a large concentration range....journal article 2023
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Serati de Brito, Caique (author), Faria Junior, Paulo E. (author), Ghiasi, T.S. (author), Ingla Aynés, J. (author), Rabahi, César Ricardo (author), Cavalini, Camila (author), Mañas Valero, S. (author), Taniguchi, Takashi (author), van der Zant, H.S.J. (author)van der Waals heterostructures composed of two-dimensional (2D) transition metal dichalcogenides and vdW magnetic materials offer an intriguing platform to functionalize valley and excitonic properties in nonmagnetic TMDs. Here, we report magneto photoluminescence (PL) investigations of monolayer (ML) MoSe<sub>2</sub> on the layered A-type...journal article 2023
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Bauer, T.A. (author), Davis, Timothy J. (author), Frank, Bettina (author), Dreher, Pascal (author), Janoschka, David (author), Meiler, Tim C. (author), Meyer zu Heringdorf, Frank J. (author), Kuipers, L. (author), Giessen, Harald (author)The creation and manipulation of optical vortices, both in free space and in two-dimensional systems such as surface plasmon polaritons (SPPs), has attracted widespread attention in nano-optics due to their robust topological structure. Coupled with strong spatial confinement in the case of SPPs, these plasmonic vortices and their underlying...journal article 2023
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Fan, Zhi Yuan (author), Qiu, Liu (author), Groeblacher, S. (author), Li, Jie (author)Microwave-optics entanglement is a vital component for building hybrid quantum networks. Here, a new mechanism for preparing stationary entanglement between microwave and optical cavity fields in a cavity optomagnomechanical system is proposed. It consists of a magnon mode in a ferrimagnetic crystal that couples directly to a microwave cavity...journal article 2023
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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