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Optical phased array neural probes for beam-steering in brain tissue.

Wesley D Sacher, Fu-Der Chen, Homeira Moradi-Chameh

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    New neural probes with optical phased arrays enable precise light delivery deep within brain tissue for optogenetics and imaging. This technology allows for advanced neuroscience research and potential therapeutic applications.

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    Area of Science:

    • Neuroscience
    • Biophotonics
    • Materials Science

    Background:

    • Implantable neural probes are crucial for studying brain function.
    • Current methods for light delivery to deep brain tissue have limitations.
    • Nanophotonic waveguides offer potential for precise light delivery.

    Purpose of the Study:

    • To develop and demonstrate neural probes with integrated optical phased arrays.
    • To enable controlled, dynamic illumination of deep brain regions.
    • To advance optogenetic stimulation and calcium imaging techniques.

    Main Methods:

    • Fabrication of silicon neural probes with integrated nanophotonic waveguides and optical phased arrays.
    • In vitro demonstration of optical beam steering.
    • Computational simulation and characterization of beam formation in brain tissue.
    • Application in optogenetic stimulation and calcium imaging experiments.

    Main Results:

    • Successful demonstration of optical beam steering with the integrated phased arrays.
    • Characterization of light beam formation within simulated brain tissue.
    • Effective use of the probes for both optogenetic stimulation and calcium imaging.

    Conclusions:

    • The developed neural probes offer precise control over light delivery to deep brain tissue.
    • This technology enhances capabilities for optogenetics and in vivo neural recording.
    • The findings pave the way for more sophisticated neural interface technologies.