An in vitro demonstration of CMOS-based optoelectronic neural interface device for optogenetics

Area of Science:

• Neuroscience
• Biomedical Engineering
• Materials Science

Background:

• Optogenetics enables precise control of neural activity using light-sensitive proteins.
• Existing optogenetic tools often require bulky external light sources, limiting their integration and application.
• Developing compact, integrated light sources is crucial for advanced neural interfaces.

Purpose of the Study:

• To fabricate and demonstrate a CMOS-based neural interface device with an integrated micro light source array for optogenetics.
• To integrate a Gallium Indium Nitride (GaInN) LED array with a CMOS image sensor capable of on-chip current injection.
• To validate the device's functionality in stimulating ChR2-expressed cells.

Main Methods:

• Fabrication of a Gallium Indium Nitride (GaInN) LED array on a sapphire substrate.
• Assembly of the GaInN LED array with a multifunctional CMOS image sensor.
• Demonstration of on-chip current injection for light emission.
• In vitro optogenetic stimulation experiments using ChR2-expressed cells.

Main Results:

• Successful fabrication and assembly of the integrated CMOS-based neural interface device.
• Demonstrated functionality of the integrated micro light source array for optogenetics.
• Successful light stimulation of ChR2-expressed cells using the fabricated device in an in vitro setting.

Conclusions:

• The developed CMOS-based neural interface with an integrated micro light source is a viable platform for optogenetic applications.
• The device shows potential for precise neural stimulation and interfacing.
• Further development could lead to more advanced and miniaturized neural recording and stimulation systems.