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Optical angular momentum derivation and evolution from vector field superposition.

Liang Fang, Jian Wang

    Optics Express
    |October 19, 2017
    PubMed
    Summary
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    This study explores optical angular momentum in vector fields, detailing spin and orbital components. It reveals spin-orbit shifts and helical trajectories, especially in non-paraxial conditions.

    Area of Science:

    • Optics and Photonics
    • Quantum Mechanics

    Background:

    • Optical intrinsic angular momentum arises from the spatial superposition of optical vector fields.
    • Understanding the spin and orbital angular momentum (SAM and OAM) components is crucial for advanced optical applications.

    Purpose of the Study:

    • To comprehensively study all angular momentum contents of optical vector fields in arbitrary superposition states.
    • To investigate the derivation, evolution, and correlations of various angular momentum components, including longitudinal and transverse SAM and OAM.

    Main Methods:

    • Employing vectorial formulation derivation to analyze optical vector fields.
    • Studying arbitrary superposition states of optical vector fields.

    Main Results:

    Related Experiment Videos

  • Identified inherent spin-orbit shift from longitudinal SAM to OAM in orthogonal superposition fields.
  • Observed local spin flow manifesting multiple-fold helical trajectories.
  • Found that spin-orbit shift and transverse SAM become considerable under non-paraxial conditions.

    • Conclusions:

    • Provides explicit insights into the derivation, evolution, and intrinsic correlations of diverse angular momentum components in optical vector fields.
    • Highlights the significance of non-paraxial conditions for spin-orbit interactions and transverse SAM.