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Related Experiment Video

Updated: May 29, 2025

Optrode Array for Simultaneous Optogenetic Modulation and Electrical Neural Recording
06:36

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Sapphire-Based Optrode for Low Noise Neural Recording and Optogenetic Manipulation.

Yanyan Xu1, Ben-Zheng Li2,3,4, Xinlong Huang5

  • 1State Key Laboratory of Optoelectronic Materials and Technologies, School of Electronics and Information Technology, Sun Yat-Sen University, Guangzhou 510275, China.

ACS Chemical Neuroscience
|February 6, 2025
PubMed
Summary

Researchers developed a novel Gallium Nitride (GaN) optrode for simultaneous neural recording and optogenetic stimulation. This device integrates a high-intensity blue light-emitting diode (LED) with a recording array, enabling precise deep brain access for neuroscience research.

Keywords:
auditory brainstemelectrophysiologyneural recordingoptical stimulationoptogeneticssapphire optrode

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Area of Science:

  • Neuroscience
  • Biomedical Engineering
  • Materials Science

Background:

  • Optogenetic stimulation combined with electrophysiological recording is crucial for understanding neural circuits and behavior.
  • Advancements in implantable optrodes are needed to improve spatiotemporal resolution for research and clinical applications.
  • Current neural optrodes often lack integration of high-intensity light sources with recording capabilities, hindering deep brain studies.

Purpose of the Study:

  • To develop a novel neural optrode integrating simultaneous electrophysiological recording and optogenetic stimulation.
  • To address the need for robust, easy-to-use optrodes for deep brain access.
  • To validate the performance of the developed optrode in vivo.

Main Methods:

  • Fabrication of a monolithic neural optrode using Gallium Nitride (GaN) on sapphire technology.
  • Integration of a high-intensity blue light-emitting diode (LED) with a 5x2 recording array.
  • Incorporation of metal grounding interlayers to mitigate LED-induced noise artifacts.
  • Electromagnetic simulations and experimental validation of noise reduction techniques.
  • In vivo electrophysiological recordings in mouse olfactory bulbs and gerbil medial superior olive (MSO).

Main Results:

  • Successful monolithic integration of a high-intensity blue LED with a 5x2 recording array.
  • Demonstrated significant reduction of LED-induced noise artifacts using metal grounding interlayers.
  • Successfully recorded action potentials from mitral/tuft cells in mouse olfactory bulbs in vivo.
  • Confirmed elevation of action potential firing in gerbil MSO neurons via optogenetic stimulation, demonstrating deep brain access.

Conclusions:

  • The developed GaN-on-sapphire optrode enables simultaneous, low-noise neural recording and optogenetic manipulation in deep brain regions.
  • This technology offers improved spatiotemporal resolution for complex neuroscience research and potential clinical applications.
  • The optrode's design effectively addresses challenges in noise interference, paving the way for advanced neural interface development.