Orthogonal separation of arbitrary vector beams from non-polarized light waves based on a patterned liquid-crystal...

Area of Science:

• Optics
• Materials Science
• Photonics

Background:

• Orthogonal separation of vector polarized beams from unpolarized light is challenging.
• Existing methods often require complex nanostructures.

Purpose of the Study:

• To propose an effective method for orthogonally separating arbitrary vector polarized beams from non-polarized incident light.
• To demonstrate a tunable approach for generating and manipulating vector beams.

Main Methods:

• Utilizing liquid-crystal (LC) molecules with patterned spatial distribution via photo-alignment and electrically controlled birefringence.
• Employing a smooth surface without nano-grooves for efficient light-wave transformation.
• Inducing desired LC director arrangement for acquiring extraordinary light waves with arbitrary spatial polarization.
• Achieving beam convergence using microhole-patterned electrodes and a gradient refractive index LC layer controlled by applied voltage.

Main Results:

• Demonstrated highly efficient light-wave transformation and acquisition of extraordinary light waves with specific spatial polarization.
• Successfully achieved orthogonal separation of arbitrary vector beams from non-polarized light.
• Showcased the ability to generate and converge arbitrary vector beams adaptively.

Conclusions:

• The proposed liquid-crystal-based method offers a versatile platform for orthogonal separation of vector beams.
• This approach facilitates the generation, manipulation, and focusing of arbitrary vector beams.
• The findings are expected to advance vector beam technologies and their applications.