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Related Concept Videos

Non-ohmic Devices00:51

Non-ohmic Devices

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In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode is a circuit device that allows current flow in only one direction.
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Related Experiment Video

Updated: Mar 6, 2026

Optrode Array for Simultaneous Optogenetic Modulation and Electrical Neural Recording
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Optrode Array for Simultaneous Optogenetic Modulation and Electrical Neural Recording

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A sapphire based monolithic integrated optrode.

He Zhang, Weihua Pei, Xiaowei Yang

    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
    |March 9, 2017
    PubMed
    Summary
    This summary is machine-generated.

    This study introduces a novel optrode for optogenetics, integrating neural electrodes and a GaN-LED on sapphire. This device enables simultaneous neural recording and optogenetic stimulation, advancing neuroscience research.

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    Area of Science:

    • Neuroscience
    • Bioengineering
    • Materials Science

    Background:

    • Optogenetics requires precise light delivery and neural recording.
    • Existing optrodes face challenges in integration and performance.

    Purpose of the Study:

    • To develop a novel, monolithically integrated optrode for optogenetic applications.
    • To enable simultaneous neural activity recording and optogenetic stimulation.

    Main Methods:

    • Fabrication of an optrode on a sapphire substrate.
    • Integration of eight thin-film neural electrodes and a Gallium Nitride Light Emitting Diode (GaN-LED).
    • Characterization of LED output power, electrode impedance, and thermal properties.

    Main Results:

    • The optrode features a GaN-LED with output power density of 1-19 mW/mm² at 468 nm.
    • Mean electrochemical impedance of recording sites is 385 kΩ at 1 kHz.
    • Minimal temperature increase (<1 °C) at the tissue interface during operation.

    Conclusions:

    • The developed optrode offers a powerful, integrated solution for optogenetics.
    • Monolithic integration enhances functionality for neuroscience research.
    • The device demonstrates safe and effective performance for neural stimulation and recording.