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DTSTART;TZID=Europe/Berlin:20260429T160000
DTEND;TZID=Europe/Berlin:20260429T170000
DTSTAMP:20260423T070232
CREATED:20260324T091847Z
LAST-MODIFIED:20260324T091924Z
UID:7185-1777478400-1777482000@lasers4.eu
SUMMARY:Laserlab-Europe Talk: Materials and post-processes for multi-photon lithography\, 29 April 2026
DESCRIPTION:Title: Materials and post-processes for multi-photon lithography\nSpeaker: Dimitra Ladika (VULRC)\nDate: Wednesday\, 29 April 2026\, 16:00-17:00 Central European Summer Time (CEST) \nMulti-photon lithography (MPL) enables the fabrication of true 3D micro- and nanostructures without the need for masks or complex tooling\, directly from computer-aided designs. Owing to these unique capabilities\, MPL has emerged as a powerful manufacturing technique across a wide range of disciplines. The ongoing growth of MPL is closely linked to advances in material design and post-processing strategies. \nIn particular\, the composition of MPL photoresists\, including the presence or absence of photoinitiators\, plays a critical role in defining fabrication thresholds\, resolution\, and the optical properties of the resulting structures. While photoinitiators can enhance polymerization efficiency\, they may also introduce fluorescence and coloration\, limiting their use in certain applications. In contrast\, photoinitiator-free and doped systems offer alternative pathways toward improved optical performance. The interaction of these materials with femtosecond laser irradiation across multiple wavelengths provides additional flexibility for controlling polymerization and tailoring spectral response. \nAdditionally\, post-processing approaches\, such as calcination and surface coatings\, further extend the capabilities of MPL by enabling the fabrication of fully inorganic and spectrally adaptable architectures. These strategies enhance the functionality and stability of the fabricated 3D structures without fundamentally altering the initial material platform. \nOverall\, these developments demonstrate the potential of material-driven approaches in MPL for applications in photonics and optoelectronics. \nRegistration here
URL:https://lasers4.eu/event/laserlab-europe-talk-materials-and-post-processes-for-multi-photon-lithography/
CATEGORIES:Webinars
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DTSTART;TZID=Europe/Berlin:20260520T160000
DTEND;TZID=Europe/Berlin:20260520T170000
DTSTAMP:20260423T070232
CREATED:20260420T084756Z
LAST-MODIFIED:20260420T084803Z
UID:7199-1779292800-1779296400@lasers4.eu
SUMMARY:Laserlab-Europe Talk: Elucidating the Photon Migration Effects in Incubated Chicken Eggs using Time-Domain Diffuse Optics\, 20 May 2026
DESCRIPTION:Title: Elucidating the Photon Migration Effects in Incubated Chicken Eggs using Time-Domain Diffuse Optics Speaker: Lennard van den Tweel (Wageningen University and Research) Date: Wednesday\, 20 May 2026\, 16:00 Central European Summer Time (CEST) \nThe early and non-invasive assessment of chicken embryonic sex and viability is of great interest. This interest is driven by the ethical dilemma surrounding the culling of non-productive day-old male chicks in layer-hen production and by the need to improve hatchery efficiency. Optical techniques are widely investigated for these applications\, but are challenged by the complex optical properties and heterogeneous structure of avian eggs. Here\, we show that chicken eggs display unusual photon trapping behavior due to the eggshell behaving like an integrating sphere\, considerably extending photon time-of-flight. Time-domain diffuse optical spectroscopy (TD-DOS) on egg phantoms\, supported by Monte Carlo simulations and post-dispersive filtering experiments\, rule out fluorescence as the source for the long photon time-of-flight. These results point to diffuse reflections at the inner surface of the eggshell as the source of the long photon time-of-flight. Despite these boundary effects\, the retrieval of internal bulk optical properties remains feasible via inversion of the diffusion approximation after selection of appropriate boundary conditions\, as was demonstrated in incubated eggs. Finally\, phantom experiments illustrate how the integrating sphere affects the temporal response of time-resolved Raman and fluorescence measurements\, highlighting critical challenges in non-invasive optical characterization of avian embryos. \n			\n			\n				\n				\n				\n				\n			\n				\n				\n				\n				\n				\n				\n				Registration
URL:https://lasers4.eu/event/lle-talk-elucidating-the-photon-migration-effects-in-incubated-chicken-eggs-using-time-domain-diffuse-optics-20-may-2026/
CATEGORIES:Webinars
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