Spin-to-Orbital Angular Momentum Mapping of Polychromatic Light

Area of Science:

• Optics and Photonics
• Materials Science

Background:

• Reflective geometric phase flat optics offer potential for polychromatic beam shaping using chiral anisotropic media.
• A key limitation is the lack of guaranteed geometric phase reversal upon flipping incident light helicity, hindering broadband applications.

Purpose of the Study:

• To overcome the fundamental limitation of geometric phase reversal in flat optics.
• To develop a simple and robust add-on solution for enhanced broadband beam shaping.
• To demonstrate the advantages of the proposed method in spin-to-orbital angular momentum mapping.

Main Methods:

• Introduction of a novel add-on component to existing flat optic designs.
• Experimental validation of the add-on's performance in achieving geometric phase reversal.
• Characterization of spin-to-orbital angular momentum mapping capabilities.

Main Results:

• Successfully demonstrated a simple and robust add-on that ensures geometric phase reversal.
• Overcame the mitigation of broadband benefits previously caused by non-reversible geometric phase.
• Showcased significant advantages in spin-to-orbital angular momentum mapping applications.

Conclusions:

• The developed add-on provides a fundamental solution for achieving true geometric phase reversal in flat optics.
• This advancement significantly enhances the capabilities of polychromatic beam shaping and spin-orbit interaction manipulation.
• The findings pave the way for more efficient and versatile optical devices.