Tailoring light delivery for optogenetics by modal demultiplexing in tapered optical fibers

Optogenetic control of neural activity in deep brain regions ideally requires precise and flexible light delivery with non-invasive devices. To this end, Tapered Optical Fibers (TFs) represent a versatile tool that can deliver light over either large brain volumes or spatially confined sub-regions,...

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Published in:Scientific reports 2018-03, Vol.8 (1), p.4467-11, Article 4467
Main Authors: Pisanello, Marco, Pisano, Filippo, Sileo, Leonardo, Maglie, Emanuela, Bellistri, Elisa, Spagnolo, Barbara, Mandelbaum, Gil, Sabatini, Bernardo L, De Vittorio, Massimo, Pisanello, Ferruccio
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Language:English
Subjects:
Animals
Brain slice preparation
Fibers
Genetics
Humans
Information processing
Light
Male
Optical Fibers
Optics
Optogenetics - instrumentation
Photic Stimulation - instrumentation
Visual cortex
Visual Cortex - physiology
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creator Pisanello, Marco
Pisano, Filippo
Sileo, Leonardo
Maglie, Emanuela
Bellistri, Elisa
Spagnolo, Barbara
Mandelbaum, Gil
Sabatini, Bernardo L
De Vittorio, Massimo
Pisanello, Ferruccio
description Optogenetic control of neural activity in deep brain regions ideally requires precise and flexible light delivery with non-invasive devices. To this end, Tapered Optical Fibers (TFs) represent a versatile tool that can deliver light over either large brain volumes or spatially confined sub-regions, while being sensibly smaller than flat-cleaved optical fibers. In this work, we report on the possibility of further extending light emission length along the taper in the range 0.4 mm-3.0 mm by increasing the numerical aperture of the TFs to NA = 0.66. We investigated the dependence between the input angle of light (θ ) and the output position along the taper, finding that for θ  > 10° this relationship is linear. This mode-division demultiplexing property of the taper was confirmed with a ray tracing model and characterized for 473 nm and 561 nm light in quasi-transparent solution and in brain slices, with the two wavelengths used to illuminate simultaneously two different regions of the brain using only one waveguide. The results presented in this manuscript can guide neuroscientists to design their optogenetic experiments on the base of this mode-division demultiplexing approach, providing a tool that potentially allow for dynamic targeting of regions with diverse extension, from the mouse VTA up to the macaque visual cortex.
doi_str_mv 10.1038/s41598-018-22790-z
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subjects Animals
Brain slice preparation
Fibers
Genetics
Humans
Information processing
Light
Male
Optical Fibers
Optics
Optogenetics - instrumentation
Photic Stimulation - instrumentation
Visual cortex
Visual Cortex - physiology
title Tailoring light delivery for optogenetics by modal demultiplexing in tapered optical fibers
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