Polarizing beam splitter cube for circularly and elliptically polarized light.

Area of Science:

• Optics and Photonics
• Materials Science
• Liquid Crystal Technology

Background:

• Polarizing beam splitters (PBS) are crucial optical components for manipulating light polarization.
• Existing PBS technologies often face limitations in terms of size, efficiency, or tunability.
• Liquid crystal polymers (LCPs) offer unique optical properties for advanced photonic devices.

Purpose of the Study:

• To demonstrate a new method for designing arbitrary polarizing beam splitter (PBS) cubes.
• To utilize cholesteric and nematic liquid crystal polymer layers for polarization control.
• To achieve arbitrary orthogonal polarization states for transmitted and reflected light.

Main Methods:

• Design and fabrication of PBS cubes using multi-layered thin-film liquid crystal polymers.
• Utilizing cholesteric phase liquid crystal polymer (Ch-LCP) for initial polarization splitting.
• Employing additional nematic liquid crystal polymer layers to tune output polarization states.

Main Results:

• Successfully designed, fabricated, and tested two distinct PBS cube prototypes.
• Demonstrated transmission of one elliptical polarization handedness and reflection of the orthogonal state.
• Showcased the ability to control output polarization to any two orthogonal states on the Poincaré sphere.

Conclusions:

• The proposed LCP-based methodology enables the design of versatile and tunable PBS cubes.
• This approach offers precise control over light polarization, expanding possibilities in optical systems.
• The fabricated prototypes validate the theoretical design principles for advanced polarization control.