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Ultrathin plasmonic chiral phase plate.

Yuri Gorodetski, Cyriaque Genet, Thomas W Ebbesen

    Optics Letters
    |September 16, 2016
    PubMed
    Summary

    Researchers created an ultrathin gold membrane acting as a phase plate. This device generates vortex beams with controlled angles using plasmonic structures and spin-orbit interactions.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Nanotechnology

    Background:

    • Phase plates are crucial optical components for beam shaping.
    • Generating and controlling vortex beams with specific properties is an active research area.
    • Plasmonic nanostructures offer unique light-matter interaction capabilities.

    Purpose of the Study:

    • To demonstrate an ultrathin phase plate based on a free-standing gold membrane.
    • To generate a far-field vortex beam propagating at a desired angle.
    • To investigate the role of plasmonic structures and spin-orbit interaction in beam generation.

    Main Methods:

    • Fabrication of a thin free-standing gold membrane.
    • Engraving complex plasmonic structures on both sides of the membrane.
    • Utilizing groove helicity and geometric phase from plasmonic spin-orbit interaction.
    • Employing radial chirp on the back-side structure for angle control.

    Main Results:

    • The gold membrane successfully functioned as an ultrathin phase plate.
    • Generation of a far-field vortex beam with controllable propagation angle.
    • Demonstration of angular momentum generation via groove helicity and geometric phase.
    • Modification of emission angle achieved through radial chirp and momentum matching.

    Conclusions:

    • An ultrathin, free-standing gold membrane with engraved plasmonic structures can act as an efficient phase plate.
    • This approach enables the generation of tunable vortex beams with controlled angular momentum and emission angles.
    • The study highlights the potential of plasmonic nanostructures for advanced beam manipulation applications.

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