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Related Experiment Video

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Ultrasonically Powered Compact Implantable Dust for Optogenetics.

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    Summary
    This summary is machine-generated.

    This study introduces an ultrasonically powered microsystem for deep tissue optogenetic stimulation. The device efficiently harvests acoustic energy to power a microLED for freely moving animal research.

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    Area of Science:

    • Biomedical Engineering
    • Neuroscience
    • Materials Science

    Background:

    • Optogenetic stimulation is crucial for neuroscience research, but requires effective power delivery systems.
    • Existing power sources for in-vivo optogenetics can be invasive or limit animal movement.
    • Deep tissue stimulation presents unique challenges for power transmission and light delivery.

    Purpose of the Study:

    • To develop and validate an ultrasonically powered microsystem for deep tissue optogenetic stimulation.
    • To enable untethered and freely moving animal studies using optogenetics.
    • To integrate efficient energy harvesting with micro-scale light delivery.

    Main Methods:

    • Modelling and simulation of piezoelectric crystal for energy harvesting.
    • Design, fabrication, and testing of a custom rectifier chip in TSMC 0.18 μm CMOS technology.
    • Integration of a piezoelectric harvester, rectifier chip, and micro-light-emitting-diode (LED).
    • System testing in a mimicking setup and final prototyping with bio-compatible encapsulation.

    Main Results:

    • The microsystem achieved an available electrical power of 1.2 μW under a load of 10 μW/mm² acoustic intensity.
    • The rectifier chip occupied a silicon area of 0.03 mm².
    • The integrated system, including a 1 mm³ piezoelectric cube and a 200 μm LED, was successfully prototyped.
    • The final packaged device had a total volume of approximately 10 mm³.

    Conclusions:

    • The developed ultrasonically powered microsystem is a viable solution for deep tissue optogenetic stimulation in freely moving animals.
    • The system demonstrates efficient acoustic energy harvesting and microLED powering capabilities.
    • This technology has the potential to advance neuroscience research by enabling less invasive and more versatile optogenetic experiments.