Hybrid multimode - multicore fibre based holographic endoscope for deep-tissue neurophotonics

0564722 - ÚPT 2023 RIV CN eng J - Journal Article
Du, Y. - Turtaev, S. - Leite, I. T. - Lorenz, A. - Kobelke, J. - Wondraczek, K. - Čižmár, Tomáš
Hybrid multimode - multicore fibre based holographic endoscope for deep-tissue neurophotonics.
Light: Advanced Manufacturing. Roč. 3, č. 3 (2022), č. článku 29. ISSN 2689-9620
R&D Projects: GA MŠMT EF15_003/0000476
Institutional support: RVO:68081731
Keywords : Multimode fibre * Multicore fibre * Fibre-based imaging * Microendoscopy * Endomicroscopy * Holographic endoscopy
OECD category: Optics (including laser optics and quantum optics)
Method of publishing: Open access
https://www.light-am.com/article/doi/10.37188/lam.2022.029

n-vivo microendoscopy in animal models became a groundbreaking technique in neuroscience that rapidly expands our understanding of the brain. Emerging hair-thin endoscopes based on multimode fibres are now opening up the prospect of ultra-minimally invasive neuroimaging of deeply located brain structures. Complementing these advancements with methods of functional imaging and optogenetics, as well as extending its applicability to awake and motile animals constitute the most pressing challenges for this technology. Here we demonstrate a novel fibre design capable of both, high-resolution imaging in immobilised animals and bending-resilient optical addressing of neurons in motile animals. The optimised refractive index profile and the probe structure allowed reaching a spatial resolution of 2 μm across a 230 μm field of view for the initial layout of the fibre. Simultaneously, the fibre exhibits negligible cross-talk between individual inner-cores during fibre deformation. This work provides a technological solution for imaging-assisted spatially selective photo-activation and activity monitoring in awake and freely moving animal models.
Permanent Link: https://hdl.handle.net/11104/0336346