Graphene-based carbon-layered electrode array technology for neural imaging and optogenetic applications.

Area of Science:

• Neuroscience
• Materials Science
• Biomedical Engineering

Background:

• Neural microelectrodes are crucial for electrophysiology but often impede optical access.
• Existing neural interfaces lack broad optical transparency and mechanical compliance.
• Simultaneous electrophysiology and optical techniques require advanced neural probe designs.

Purpose of the Study:

• To develop and characterize a transparent, flexible neural microelectrode array for integrated neuroimaging and stimulation.
• To evaluate the utility of the graphene-based array for high-resolution neural recording and optical interfacing.
• To demonstrate the device's compatibility with various optical techniques and optogenetic modulation.

Main Methods:

• Fabrication of a graphene-based, carbon-layered electrode array (CLEAR).
• Characterization of optical transparency across ultraviolet to infrared spectrum (>90% transmission).
• In vivo implantation on rodent brain surface for neurophysiological recording and optical experiments.

Main Results:

• The CLEAR device exhibits >90% optical transparency from UV to IR spectrum.
• Demonstrated optogenetic activation of cortical areas beneath the electrodes.
• Successfully performed in vivo imaging of cortical vasculature using fluorescence microscopy and 3D optical coherence tomography.

Conclusions:

• The CLEAR device offers a novel platform for multimodal neural interfacing.
• Broad spectrum transparency and mechanical flexibility enable simultaneous electrophysiology and optical imaging.
• This technology advances the capabilities for studying and modulating neural circuits.