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Spin and orbital angular momentum and their conversion in cylindrical vector vortices
Optics Letters
|August 1, 2014
Summary
Integrated optical vortex emitters generate light beams with orbital angular momentum (OAM). Varying emitter size reveals spin-orbit interactions, leading to purer OAM states in cylindrical vector vortices (CVVs).
Area of Science:
- Optics and Photonics
- Quantum Information Science
Background:
- Integrated optical vortex emitters enable advanced light beam generation.
- Optical vortices, or cylindrical vector vortices (CVVs), possess unique polarization and phase properties.
Purpose of the Study:
- To theoretically demonstrate the well-defined total angular momentum of CVVs.
- To investigate the impact of spin-orbit interactions on CVVs.
Main Methods:
- Modeling CVVs using the radiation of angularly arranged dipoles.
- Analyzing CVVs as hybrid modes of two circularly polarized scalar vortices.
Main Results:
- Theoretical demonstration of well-defined total angular momentum in CVVs.
- Identification of spin-orbit interactions affecting angular momentum in CVVs.
- Observation of diminishing spin angular momentum and purer OAM states at larger structure radii.
Conclusions:
- CVVs generated by integrated emitters possess well-defined total angular momentum.
- Spin-orbit interactions play a crucial role in shaping the angular momentum composition of CVVs.
- Tailoring emitter size offers a method to control and enhance orbital angular momentum purity.
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