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Updated: Nov 3, 2025
12:21
Stimulated Stokes and Antistokes Raman Scattering in Microspherical Whispering Gallery Mode Resonators
Published on: April 4, 2016
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Spin-orbit interactions in a nonlinear medium due to a nonlinear-induced geometric phase
Optics Letters
|June 1, 2021
Summary
Nonlinear media enable spin-polarized photons to gain orbital angular momentum without spin reversal. This research reveals the physics behind this spin-to-orbital angular momentum conversion, driven by nonlinear-induced geometric phase.
Area of Science:
- Quantum optics
- Nonlinear optics
- Photonics
Background:
- Spin angular momentum (SAM) and intrinsic orbital angular momentum (IOAM) of photons typically do not couple without spin reversal.
- Understanding light-matter interactions in nonlinear media is crucial for advanced optical technologies.
Purpose of the Study:
- To investigate the possibility of coupling SAM to IOAM in nonlinear media without requiring spin reversal.
- To elucidate the underlying physical mechanisms and characterize the SAM-to-IOAM conversion process.
Main Methods:
- Establishing an evolution ray equation for photons carrying IOAM, referencing the Schrödinger equation.
- Analyzing the phenomenon from a full-wave perspective.
Main Results:
- Demonstrated that nonlinear media can impart IOAM to spin-polarized photons.
- Identified that this conversion occurs due to nonlinear susceptibility along the transmission direction and does not necessitate spin reversal.
- Revealed that vortex generation stems from a nonlinear-induced geometric phase.
Conclusions:
- Nonlinear optical media offer a novel pathway for converting photon spin angular momentum to orbital angular momentum.
- The findings provide new insights into light-matter interactions in nonlinear systems and vortex generation.
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