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Numerical Calculation of the Light Propagation in Tapered Optical Fibers for Optical Neural Interfaces

As implantable optical systems recently enabled new approaches to study the brain with optical radiations, tapered optical fibers emerged as promising implantable waveguides to deliver and collect light from sub-cortical structures of the mouse brain. They rely on a specific feature of multimodal fi...

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Autores principales: Mach-Batlle, Rosa, Pisanello, Marco, Pisano, Filippo, De Vittorio, Massimo, Pisanello, Ferruccio, Ciracì, Cristian
Formato: Online Artículo Texto
Lenguaje:English
Publicado: 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8880829/
https://www.ncbi.nlm.nih.gov/pubmed/35221462
http://dx.doi.org/10.1109/JLT.2021.3118898
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author Mach-Batlle, Rosa
Pisanello, Marco
Pisano, Filippo
De Vittorio, Massimo
Pisanello, Ferruccio
Ciracì, Cristian
author_facet Mach-Batlle, Rosa
Pisanello, Marco
Pisano, Filippo
De Vittorio, Massimo
Pisanello, Ferruccio
Ciracì, Cristian
author_sort Mach-Batlle, Rosa
collection PubMed
description As implantable optical systems recently enabled new approaches to study the brain with optical radiations, tapered optical fibers emerged as promising implantable waveguides to deliver and collect light from sub-cortical structures of the mouse brain. They rely on a specific feature of multimodal fiber optics: as the waveguide narrows, the number of guided modes decreases and the radiation can gradually couple with the environment. This happens along a taper segment whose length can be tailored to match with the depth of functional structures of the mouse brain, and can extend for a few millimeters. This anatomical requirement results in optical systems which have an active area that is very long compared to the wavelength of the light they guide and their behavior is typically estimated by ray tracing simulations, because finite element methods are too computationally demanding. Here we present a computational technique that exploits the beam-envelope method and the cylindrical symmetry of the fibers to provide an efficient and exact calculation of the electric field along the fibers, which may enable the design of neural interfaces optimized to meet different goals.
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spelling pubmed-88808292022-02-25 Numerical Calculation of the Light Propagation in Tapered Optical Fibers for Optical Neural Interfaces Mach-Batlle, Rosa Pisanello, Marco Pisano, Filippo De Vittorio, Massimo Pisanello, Ferruccio Ciracì, Cristian J Lightwave Technol Article As implantable optical systems recently enabled new approaches to study the brain with optical radiations, tapered optical fibers emerged as promising implantable waveguides to deliver and collect light from sub-cortical structures of the mouse brain. They rely on a specific feature of multimodal fiber optics: as the waveguide narrows, the number of guided modes decreases and the radiation can gradually couple with the environment. This happens along a taper segment whose length can be tailored to match with the depth of functional structures of the mouse brain, and can extend for a few millimeters. This anatomical requirement results in optical systems which have an active area that is very long compared to the wavelength of the light they guide and their behavior is typically estimated by ray tracing simulations, because finite element methods are too computationally demanding. Here we present a computational technique that exploits the beam-envelope method and the cylindrical symmetry of the fibers to provide an efficient and exact calculation of the electric field along the fibers, which may enable the design of neural interfaces optimized to meet different goals. 2022-01 2021-10-08 /pmc/articles/PMC8880829/ /pubmed/35221462 http://dx.doi.org/10.1109/JLT.2021.3118898 Text en https://creativecommons.org/licenses/by/4.0/This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see https://creativecommons.org/licenses/by/4.0/
spellingShingle Article
Mach-Batlle, Rosa
Pisanello, Marco
Pisano, Filippo
De Vittorio, Massimo
Pisanello, Ferruccio
Ciracì, Cristian
Numerical Calculation of the Light Propagation in Tapered Optical Fibers for Optical Neural Interfaces
title Numerical Calculation of the Light Propagation in Tapered Optical Fibers for Optical Neural Interfaces
title_full Numerical Calculation of the Light Propagation in Tapered Optical Fibers for Optical Neural Interfaces
title_fullStr Numerical Calculation of the Light Propagation in Tapered Optical Fibers for Optical Neural Interfaces
title_full_unstemmed Numerical Calculation of the Light Propagation in Tapered Optical Fibers for Optical Neural Interfaces
title_short Numerical Calculation of the Light Propagation in Tapered Optical Fibers for Optical Neural Interfaces
title_sort numerical calculation of the light propagation in tapered optical fibers for optical neural interfaces
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8880829/
https://www.ncbi.nlm.nih.gov/pubmed/35221462
http://dx.doi.org/10.1109/JLT.2021.3118898
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