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Arbitrarily spin-orientated and super-resolved focal spot.

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    Area of Science:

    • Optics and Photonics
    • Super-resolution Microscopy
    • Spin Optics

    Background:

    • Achieving super-resolution beyond the diffraction limit is a key challenge in microscopy.
    • Controlling the spin orientation of light at the focal spot is crucial for advanced optical applications.

    Purpose of the Study:

    • To propose a facile approach for creating a robust focal spot with both super-resolution and arbitrary spin orientation.
    • To demonstrate the ability to freely tune the photonic spin direction.

    Main Methods:

    • Devising structured incident light by superposing radially and azimuthally polarized beams.
    • Utilizing vectorial diffraction integral and spin density theory for analysis.
    • Employing a 4π microscopic configuration for tight focusing and isotropic interference.

    Main Results:

    • Creation of three mutually perpendicular polarized field components beyond the diffraction limit.
    • Generation of a super-resolved focal spot with a spatial spin axis.
    • Demonstration of freely tunable photonic spin direction by adjusting amplitude factors.

    Conclusions:

    • The proposed method offers a facile approach to generate super-resolved focal spots with controllable spin orientation.
    • The ability to tune photonic spin direction opens new possibilities in spin photonics.
    • This work holds significant potential for advancements in spin photonics and super-resolution imaging.