| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Picken, S. J.
Delft University of Technology
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (16/16 displayed)
- 2024Role of Molecular Water Layer State on Freezing Front Propagation Rate and Mode Studied with Thermal Imagingcitations
- 2023Affine Deformation and Self-Assembly Alignment in Hydrogel Nanocomposites
- 2023Affine Deformation and Self-Assembly Alignment in Hydrogel Nanocomposites
- 2023Enhancing the sensitivity of silicon photonic ultrasound sensors by optimizing the stiffness of polymer cladding
- 2022Extraction of low molecular weight polyhydroxyalkanoates from mixed microbial cultures using bio-based solventscitations
- 2022High-Strength Liquid Crystal Polymer-Graphene Oxide Nanocomposites from Watercitations
- 2016Water Sorption and Diffusion in (Reduced) Graphene Oxide-Alginate Biopolymer Nanocompositescitations
- 2016Composition dependent properties of graphene (oxide)-alginate biopolymer nanocompositescitations
- 2016Rheological investigation of specific interactions in Na Alginate and Na MMT suspensioncitations
- 2015Origin of highly ordered sodium alginate/montmorillonite bionanocompositescitations
- 2013Self-healing supramolecular polymer nanocomposites
- 2011Three-phase Lewis-Nielsen model for the thermal conductivity of polymer nanocompositescitations
- 2009Thermal behaviour of epoxy resin filled with high thermal conductivity nanopowderscitations
- 2007Vapor diffusion in porous/nonporous polymer coatings by dielectric sorption analysiscitations
- 2005Multiple glass transitions in the plastic crystal phase of triphenylene derivatescitations
- 2000Highly ordered side-chain liquid-crystalline polymers from maleic anhydride and swallow-tailed 1-alkenes having two mesogens
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document
Enhancing the sensitivity of silicon photonic ultrasound sensors by optimizing the stiffness of polymer cladding
Abstract
<p>Ultrasound is widely used in medical imaging, and photo-acoustics is an upcoming imaging modality for the diagnosis of diseases. Future applications require a large matrix of small, sensitive, and broadband ultrasound sensors. However, current high-end systems still use piezo-electric material to detect ultrasound, with limited sensitivity and bandwidth. Silicon photonic circuits can meet the requirements of size, bandwidth, and scalability when designed as ultrasound sensors. Namely, a silicon photonic waveguide deforms when the ultrasound pressure waves impinge on it, leading to a change in effective refractive index, n<sub>e</sub>, due to geometrical and photo-elastic effects [1]. However, these effects are weak, which limits the intrinsic sensitivity of silicon photonic ultrasound sensors [2]. To significantly enhance sensitivity, silicon waveguides have been combined with acousto-mechanical structures, which achieved acoustomechanical-noise-limited sensing [3], but this is not compatible with standard photonic platforms. Besides that, recent demonstrations of waveguides coated with polymers also improved sensitivity of the silicon photonic ultrasound sensors significantly, but not sufficient to reach acoustomechnical-noise-limited sensing [4]. Here, we study the effect of mechanical and opto-mechanical properties of polymer claddings on the sensitivity of silicon photonic ultrasound sensors. Our aim is to enhance the sensitivity of these devices by implementing tailored polymer coatings. First, we model the refractive index sensitivity of these type of waveguides, i.e. the change in effective refractive index n<sub>e</sub> due to the incident ultrasound plane-wave with a pressure P, and we (Equation presented) where n<sub>c</sub>, p<sub>12</sub>, E, and v are refractive index, elasto-optic coefficient, Young's modulus (stiffness), and Poisson's ratio of the cladding material, respectively. We assume the change in cladding index dominates sensitivity.</p>