A broad-angle polarization beam splitter based on a simple dielectric periodic structure

Area of Science:

• Photonics and Optics
• Materials Science

Background:

• Polarization beam splitters are crucial optical components.
• Existing devices often have limited angular ranges.
• Novel structures are needed for broader applications.

Purpose of the Study:

• To propose a novel broad-angle polarization beam splitter.
• To utilize the unique spatial dispersion properties of multi-layered dielectric periodic structures.
• To achieve efficient polarization splitting over a wide angular range.

Main Methods:

• Designing a multi-layered dielectric periodic structure with specific frequency-dependent spatial dispersion.
• Engineering equal-frequency contours to be flat for TE and curved for TM polarization.
• Stacking two finite-length structures with a half-period transverse shift.

Main Results:

• The proposed structure exhibits flat equal-frequency contours for TE and curved for TM polarization.
• The structure maintains a fixed optical thickness for TE polarization across all incident angles.
• A polarization beam splitter functioning from 0 to 70 degrees was successfully achieved.

Conclusions:

• The novel multi-layered dielectric periodic structure enables broad-angle polarization splitting.
• This design offers a significant improvement in angular performance for polarization beam splitters.
• The findings have potential applications in advanced optical systems requiring wide-angle polarization control.