Heterogeneous 3D optrode with variable spatial resolution for optogenetic stimulation and electrophysiological...

Area of Science:

• Neuroscience
• Bioengineering
• Optical Engineering

Background:

• Optogenetics requires precise tools for stimulating and recording neuronal activity.
• Current optogenetic tools often lack the integrated capabilities for simultaneous optical and electrical interfacing.
• Advancements in 3D fabrication and microassembly are crucial for developing next-generation neuroscientific research devices.

Purpose of the Study:

• To conceptualize, develop, and characterize the first three-dimensional (3D) optrode.
• To create a device capable of simultaneous optical stimulation and high-resolution neural recording.
• To provide a versatile tool for optogenetic experiments in neuroscience.

Main Methods:

• Development of a novel 3D optrode integrating a single-shank optical stimulation component and a multi-shank recording probe.
• Utilizing a delicate assembly process for precise alignment of optical and electrical components.
• Employing flexible polyimide (PI) ribbon cables for robust electrical connections.
• Characterization of geometrical, optical, and electrical properties, including optical output power at 460 nm.

Main Results:

• Successful development and characterization of the first 3D optrode.
• Demonstrated capability for simultaneous optical interaction with neuronal cells and high spatial resolution recording.
• Achieved optical output power exceeding 5 mW/mm2 at 460 nm.
• Established an all-electrical interface for seamless integration.

Conclusions:

• The developed 3D optrode represents a significant advancement for optogenetic research.
• Its integrated design offers precise control and simultaneous recording, enhancing experimental capabilities.
• This device is a promising tool for future neuroscientific investigations requiring high-resolution optical and electrical interfacing.