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Related Experiment Video

Updated: Jul 9, 2025

Trapping of Micro Particles in Nanoplasmonic Optical Lattice
07:20

Trapping of Micro Particles in Nanoplasmonic Optical Lattice

Published on: September 5, 2017

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Manipulating plasmonic vortex based on meta-atoms with four rectangular slits.

Kai Gu, Yang Zhang, Hanwen Zhao

    Optics Express
    |December 2, 2023
    PubMed
    Summary

    Researchers developed novel plasmonic vortex lenses (PVLs) using geometric phase. These devices efficiently generate surface plasmon polariton (SPP) vortices with tunable topological charges (TCs) under various light polarizations.

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    Area of Science:

    • Plasmonics
    • Metamaterials
    • Optics

    Background:

    • Traditional plasmonic vortex lenses (PVLs) often rely on complex designs or transmission phase manipulation.
    • Exciting surface plasmon polariton (SPP) vortices with controlled topological charges (TCs) is crucial for various photonic applications.

    Purpose of the Study:

    • To introduce a new design for PVLs utilizing solely geometric phase manipulation.
    • To demonstrate the capability of these PVLs to generate SPP vortices with arbitrary TCs and tailored electric-field intensities.

    Main Methods:

    • Designing meta-atoms consisting of four rectangular slits with regular rotation angles.
    • Arranging these meta-atoms on circular contours to form PVLs.
    • Illuminating the PVLs with circularly polarized (CP) and linearly polarized (LP) light to excite SPP vortices.

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    Main Results:

    • PVLs generate SPP vortices with arbitrary TCs for CP light, matching traditional PVL performance.
    • For the first time, PVLs solely based on geometric phase generate SPP vortices with varying TCs and electric-field intensities for LP light.
    • The TC is dynamically tunable by controlling the polarization order of incident vector beams.

    Conclusions:

    • The proposed geometric-phase-based PVLs offer advantages in device miniaturization and uniform vortex field generation.
    • These PVLs present a more straightforward design process compared to existing geometric phase structures.
    • This work opens new avenues for efficient and simplified generation of SPP vortices.