Vortex light at the nanoscale: twists, spins, and surprises

Area of Science:

• Optics and Photonics
• Quantum Information Science
• Nanotechnology

Background:

• Optical vortex beams with orbital angular momentum (OAM) are crucial in optics, with applications in quantum information, communications, and manipulation.
• Traditional studies focus on paraxial beams, described by conventional wave optics.
• Non-paraxial vortex beams at the nanoscale display complex electromagnetic structures beyond these models.

Purpose of the Study:

• To unify the emerging physics of nanoscale optical vortices.
• To develop a coherent theoretical framework for deeply non-paraxial vortex beams.
• To synthesize recent advances and guide future research.

Main Methods:

• Theoretical framework development for nanoscale optical vortices.
• Critical synthesis of recent experimental and theoretical advances.
• Analysis of deeply non-paraxial light-matter interactions.

Main Results:

• Vortex beams in the deeply non-paraxial regime exhibit rich and counterintuitive electromagnetic behavior.
• Nanoscale optical vortices transcend conventional optical models.
• New perspectives on light-matter interactions are opened by studying these beams.

Conclusions:

• A unified understanding of nanoscale optical vortices is emerging.
• Deeply non-paraxial vortex beams present unique opportunities for fundamental research and applications.
• This review provides a foundation for further exploration in this rapidly evolving field.