Motion-less depth-selective optogenetic probe using tapered fiber and an electrically tuneable liquid crystal...

Area of Science:

• Optics
• Biomedical Engineering
• Neuroscience

Background:

• Precise control of light delivery is crucial for optical microscopy and in-vivo studies.
• Existing methods often rely on bulky mechanical components or complex optical setups.
• There is a need for miniaturized, non-mechanical devices for light manipulation in biological research.

Purpose of the Study:

• To develop and characterize a miniature, electrically tunable liquid crystal component for light steering.
• To demonstrate the device's capability for selective illumination of biological tissues at varying depths.
• To validate the device's performance in-vivo within a mouse brain model.

Main Methods:

• Utilized a miniature electrically tunable liquid crystal component to steer light.
• Injected steered light into a tapered fiber for controlled propagation.
• Generated various propagation modes and controlled their leakage for selective illumination.
• Characterized performance in Rhodamine 6G fluorescence medium and mouse brain tissue (in-vivo).

Main Results:

• Successfully steered light across a -1° to +1° range.
• Demonstrated selective illumination of surrounding media at different depths without mechanical movement.
• Validated the device's functionality in complex biological tissue (mouse brain).
• Showcased potential for precise optical control in neuroscience applications.

Conclusions:

• The developed liquid crystal component offers a compact and effective solution for light steering and selective illumination.
• This technology holds promise for advanced in-vivo optical studies, particularly in freely behaving animals.
• Further miniaturization could enable dynamic excitation or inhibition of specific brain regions for neuroscience research.