Optical spin-orbit Hall effect in a focused field from the Poincaré sphere perspective

Area of Science:

• Photonics
• Quantum Optics
• Optical Angular Momentum

Background:

• The optical Hall effect involves angular momentum separation due to spin-orbit interaction.
• Traditional optical Hall effect separates spin or orbital angular momentum.
• A new spin-orbit Hall effect separates both spin and orbital angular momentum.

Purpose of the Study:

• To numerically prove the occurrence of the spin-orbit Hall effect.
• To investigate this effect in tightly focused first-order Poincaré sphere vortex beams.

Main Methods:

• Numerical simulations were employed.
• Analysis focused on tightly focused first-order Poincaré sphere vortex beams.
• Investigated specific conditions of polarization states and vortex charges.

Main Results:

• The spin-orbit Hall effect was numerically confirmed in the studied beams.
• Spatial separation of spin and orbital angular momentum parts was observed in the focal plane.
• Specific conditions for this separation were identified based on polarization and vortex charge.

Conclusions:

• The spin-orbit Hall effect can be realized in tightly focused first-order Poincaré sphere vortex beams.
• These findings have potential applications in optical manipulation and sensing.
• The study provides a foundation for further experimental and theoretical investigations.