Shedding light on neurons: optical approaches for neuromodulation
NATIONAL SCIENCE REVIEW(2022)
Abstract
This review article provides a comprehensive overview of recent advances in optical neuromodulation in the context of addressing various physical constraints of in vivo light delivery. Today's optical neuromodulation techniques are rapidly evolving, benefiting from advances in photonics, genetics and materials science. In this review, we provide an up-to-date overview of the latest optical approaches for neuromodulation. We begin with the physical principles and constraints underlying the interaction between light and neural tissue. We then present advances in optical neurotechnologies in seven modules: conventional optical fibers, multifunctional fibers, optical waveguides, light-emitting diodes, upconversion nanoparticles, optical neuromodulation based on the secondary effects of light, and unconventional light sources facilitated by ultrasound and magnetic fields. We conclude our review with an outlook on new methods and mechanisms that afford optical neuromodulation with minimal invasiveness and footprint.
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Key words
optical neuromodulation,optogenetics,neural interfaces
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