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Optical needles with arbitrary three-dimensional spin angular momentum.

Hang Li, Yalan Wang, Feng Yang

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    Summary
    This summary is machine-generated.

    Researchers created optical needles with controllable spin direction and magnitude, a first in customizable spin angular momentum (SAM) per photon. This advancement offers precise control over light

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    Area of Science:

    • Optics and Photonics
    • Quantum Information Science

    Background:

    • Previous work established optical needles with arbitrary three-dimensional (3D) polarization.
    • Understanding the interplay between electric fields and spin angular momentum (SAM) is crucial for advanced optical applications.

    Purpose of the Study:

    • To investigate the relationship between electric fields and spin angular momentum (SAM) in optical needles.
    • To realize optical needles with arbitrary 3D spin-orientation and customizable SAM per photon.

    Main Methods:

    • Leveraged prior research on 3D polarization optical needles.
    • Developed methods to control both the direction and magnitude of SAM per photon.

    Main Results:

    • Successfully generated optical needles with arbitrary 3D spin orientation.
    • Achieved unprecedented customization of SAM per photon in terms of both direction and size.
    • Demonstrated high accuracy, with relative errors less than 5% even for small SAM values.

    Conclusions:

    • This study presents the first demonstration of optical needles with fully customizable SAM.
    • The findings pave the way for novel applications in areas requiring precise light manipulation.