Optical vortex converter with helical-periodically poled ferroelectric crystal

Area of Science:

• Optics and Photonics
• Materials Science
• Nonlinear Optics

Background:

• Optical vortices, beams with helical phase fronts, are crucial for advanced optical applications.
• Controlling the topological charge of optical vortices is essential for applications like optical manipulation and communication.
• Existing methods for optical vortex generation and manipulation can be complex or limited in tunability.

Purpose of the Study:

• To propose a novel optical vortex converter.
• To demonstrate the generation of optical vortices from non-vortex beams.
• To achieve tunable transformation of optical vortex topological charges using an electric field.

Main Methods:

• Utilizing a helical-periodically poled ferroelectric crystal.
• Leveraging the transverse electro-optics effect for optical modulation.
• Implementing an electric field control mechanism for the converter's function.

Main Results:

• Successful generation of optical vortices from a non-vortex input beam.
• Demonstration of optical vortex conversion and topological charge transformation.
• Experimental validation of an electric-field-controlled optical vortex adder/substrator.

Conclusions:

• The proposed optical vortex converter offers a new method for generating and controlling optical vortices.
• The device's ability to add or subtract topological charges via electric fields is significant.
• Potential applications include high-dimensional communication, signal processing, and micro/mesoscopic optical manipulation.