Optical Reflectance of Composites with Aligned Engineered Microplatelets.
Poloni, E.; Galinski, H.; Bouville, F.; Wilts, B.; Braginsky, L.; Bless, D.; Shklover, V.; Sicher, A.; and Studart, A. R.
Advanced Optical Materials,2201989. jan 2023.
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Paper
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bibtex
@article{Poloni_2023, doi = {10.1002/adom.202201989}, url = {https://doi.org/10.1002%2Fadom.202201989}, year = 2023, month = {jan}, publisher = {Wiley}, pages = {2201989}, author = {Erik Poloni and Henning Galinski and Florian Bouville and Bodo Wilts and Leonid Braginsky and David Bless and Valery Shklover and Alba Sicher and Andr{\'{e}} R. Studart}, title = {Optical Reflectance of Composites with Aligned Engineered Microplatelets}, journal = {Advanced Optical Materials}}
Magnetic Manipulation of Superparamagnetic Colloids in Droplet-Based Optical Devices.
Mattich, I.; Sendra, J.; Galinski, H.; Isapour, G.; Demirörs, A. F.; Lattuada, M.; Schuerle, S.; and Studart, A. R.
Advanced Optical Materials, n/a(n/a): 2300734. July 2023.
Paper
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link
bibtex
abstract
@Article{https://doi.org/10.1002/adom.202300734,
author = {Mattich, Iacopo and Sendra, Joan and Galinski, Henning and Isapour, Golnaz and Demirörs, Ahmet F. and Lattuada, Marco and Schuerle, Simone and Studart, André R.},
journal = {Advanced Optical Materials},
title = {Magnetic Manipulation of Superparamagnetic Colloids in Droplet-Based Optical Devices},
year = {2023},
issn = {2195-1071},
month = jul,
number = {n/a},
pages = {2300734},
volume = {n/a},
abstract = {Abstract Magnetically assembled superparamagnetic colloids are exploited as fluid mixers, swimmers, and delivery systems in several microscale applications. The encapsulation of such colloids in droplets may open new opportunities to build magnetically controlled displays and optical components. Here, the assembly of superparamagnetic colloids inside droplets under rotating magnetic fields is studied, and this phenomenon is exploited to create functional optical devices. Colloids are encapsulated in monodisperse droplets produced by microfluidics and magnetically assembled into dynamic 2D clusters. Using an optical microscope equipped with a magnetic control setup, the effect of the magnetic field strength and rotational frequency on the size, stability, and dynamics of 2D colloidal clusters inside droplets is investigated. The results show that cluster size and stability depend on the magnetic forces acting on the structure under the externally imposed field. By rotating the cluster in specific orientations, it is possible to magnetically control the effective refractive index and the transmission of light through the colloid-laden droplets, thus demonstrating the potential of the encapsulated colloids in optical applications.},
doi = {https://doi.org/10.1002/adom.202300734},
eprint = {https://onlinelibrary.wiley.com/doi/pdf/10.1002/adom.202300734},
keywords = {colloidal assembly, compartmentalisation, magnetic field, microfluidics, particles},
publisher = {Wiley},
url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/adom.202300734},
}
Abstract Magnetically assembled superparamagnetic colloids are exploited as fluid mixers, swimmers, and delivery systems in several microscale applications. The encapsulation of such colloids in droplets may open new opportunities to build magnetically controlled displays and optical components. Here, the assembly of superparamagnetic colloids inside droplets under rotating magnetic fields is studied, and this phenomenon is exploited to create functional optical devices. Colloids are encapsulated in monodisperse droplets produced by microfluidics and magnetically assembled into dynamic 2D clusters. Using an optical microscope equipped with a magnetic control setup, the effect of the magnetic field strength and rotational frequency on the size, stability, and dynamics of 2D colloidal clusters inside droplets is investigated. The results show that cluster size and stability depend on the magnetic forces acting on the structure under the externally imposed field. By rotating the cluster in specific orientations, it is possible to magnetically control the effective refractive index and the transmission of light through the colloid-laden droplets, thus demonstrating the potential of the encapsulated colloids in optical applications.
Multi-Material Strain Mapping with Scanning Reflectance Anisotropy Microscopy.
Sendra, J.; Haake, F.; Calvo, M.; Galinski, H.; and Spolenak, R.
Advanced Functional Materials, n/a(n/a): 2302179. June 2023.
Paper
doi
link
bibtex
abstract
@Article{https://doi.org/10.1002/adfm.202302179,
author = {Sendra, Joan and Haake, Fabian and Calvo, Micha and Galinski, Henning and Spolenak, Ralph},
journal = {Advanced Functional Materials},
title = {Multi-Material Strain Mapping with Scanning Reflectance Anisotropy Microscopy},
year = {2023},
issn = {1616-3028},
month = jun,
number = {n/a},
pages = {2302179},
volume = {n/a},
abstract = {Abstract Strain-engineering of materials encompasses significant elastic deformation and leads to breaking of the lattice symmetry and as a consequence to the emergence of optical anisotropy. However, the capability to image and map local strain fields by optical microscopy is currently limited to specific materials. Here, a broadband scanning reflectance anisotropy microscope as a phase-sensitive multi-material optical platform for strain mapping is introduced. The microscope produces hyperspectral images with diffraction-limited sub-micron resolution of the near-normal incidence ellipsometric response of the sample, which is related to elastic strain by means of the elasto-optic effect. Cutting edge strain sensitivity is demonstrated using a variety of materials, such as metasurfaces, semiconductors, and metals. The versatility of the method to study the breaking of the lattice symmetry by simple reflectance measurements opens up the possibility to carry out non-destructive mechanical characterization of multi-material components, such as wearable electronics and optical semiconductor devices.},
doi = {https://doi.org/10.1002/adfm.202302179},
eprint = {https://onlinelibrary.wiley.com/doi/pdf/10.1002/adfm.202302179},
keywords = {elasto-optic effect, metals, metasurfaces, phase-modulated microscopy, semiconductors, strain mapping},
publisher = {Wiley},
url = {https://onlinelibrary.wiley.com/doi/abs/10.1002/adfm.202302179},
}
Abstract Strain-engineering of materials encompasses significant elastic deformation and leads to breaking of the lattice symmetry and as a consequence to the emergence of optical anisotropy. However, the capability to image and map local strain fields by optical microscopy is currently limited to specific materials. Here, a broadband scanning reflectance anisotropy microscope as a phase-sensitive multi-material optical platform for strain mapping is introduced. The microscope produces hyperspectral images with diffraction-limited sub-micron resolution of the near-normal incidence ellipsometric response of the sample, which is related to elastic strain by means of the elasto-optic effect. Cutting edge strain sensitivity is demonstrated using a variety of materials, such as metasurfaces, semiconductors, and metals. The versatility of the method to study the breaking of the lattice symmetry by simple reflectance measurements opens up the possibility to carry out non-destructive mechanical characterization of multi-material components, such as wearable electronics and optical semiconductor devices.
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