| Session | ||
TOM Materials S3: Nanomaterials and Nanophotonics
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| Presentations | ||
3:30pm - 4:00pm
INVITED Plasmonic nano-antenna arrays for position-resolved single-fluorophore spectroscopy 1Eberhard Karls University of Tübingen, Germany; 2Eindhoven University of Technology, The Netherlands; 3Technical University of Denmark, Denmark Studies on individual nano-emitters offer fundamental insights into their spectral properties and emission characteristics. The signal intensity of e.g. dye molecules in fluorescence assays can be improved by coupling them to plasmonic nano-antennas. The properties of the hybrid system crucially depend on the specific position of the emitter relative to the antenna, which however cannot be resolved by conventional microscopy. An approach is demonstrated that uses nanocones as the antennas and point-spread function deformations for localization determination. Intensity time traces are investigated to study binding statistics, location-dependent enhancement factors and fluorescence reshaping. 4:00pm - 4:15pm
Control of emission properties of organic semiconductors using metallic nanoparticle arrays 1Laboratoire de Physique des Lasers CNRS UMR 7538, Université Sorbonne Paris Nord, Villetaneuse, France; 2Laboratoire de Physique et de Chimie Quantique, Université de Tizi Ouzou (Algérie) The objective of this work is to study the effects of plasmonic nanoparticle arrays on the emission of organic semiconductors used for OLEDs. As a first step, we report the investigation of the response of Agbased arrays in various configurations in terms of geometry and structure. 4:15pm - 4:30pm
Spectral and temporal characterization of the optical Kerr effect in Au/SiN multilayer hyperbolic metamaterials Department of Physics and Astronomy, NanoStructures Group (NSG), University of Padova, Via Marzolo 8, 35131 Padova, Italy Metamaterials are artificially structured media offering multiple applications. Among them, epsilon-near-zero (ENZ) metamaterials are a platform for enhanced nonlinear optical phenomena. Multilayer hyperbolic metamaterials (MHMs) belong to the latter class and are tailorable structures for the study of the optical Kerr effect (OKE). In this work, different ENZ Au/SiN MHMs are crafted, their OKE parameters are spectrally characterized, and the nonlinear response temporal dynamics is studied. 4:30pm - 4:45pm
Amorphous silicon carbide for microstructured optics 1Technische Universität Ilmenau, Germany; 25microns GmbH, Ilmenau, Germany Amorphous silicon carbide offers unique properties for the optimiza- tion of microstructured optical elements. We present a study on the technologi- cal processing, the resulting material properties as well as potential applications. 4:45pm - 5:00pm
Tailoring Persistent Luminescence Thin Films Beyond Composition Engineering Institute of Materials Science of Seville (CSIC-US), Spain Persistent phosphors, especially in nanophosphor form, are valued for their long-lasting afterglow and are promising for applications like anticounterfeiting, data storage, and imaging displays. However, their use is limited by challenges in tuning their properties and low energy storage capacity. This work introduces a novel transversal strategy to enhance persistent luminescence in nanophosphor thin films by modifying their optical environment without changing their composition. Using the sol-gel method, we fabricated layered garnet films with time-dependent chromaticity and developed transparent ZnGa₂O₄:Cr³⁺ films embedded with TiO₂-based scattering centers. This design led to a 3.5-fold increase in afterglow intensity and faster charging, thanks to enhanced light absorption and improved outcoupling. This approach demonstrates a powerful and versatile way to optimize persistent nanophosphors, opening new opportunities for creating advanced coatings with dynamic luminescent properties, particularly for high-performance anticounterfeiting applications. | ||