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Characterizing localized surface plasmon resonances using focused radially polarized beam.

Wuyun Shang, Fajun Xiao, Weiren Zhu

    Applied Optics
    |September 11, 2019
    PubMed
    Summary

    We developed a new method using focused radially polarized beams (RPB) to study localized surface plasmon resonances (LSPRs) in metallic nanorods. This technique allows for selective excitation and characterization of plasmon modes in individual nanostructures.

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    Area of Science:

    • Nanophotonics
    • Plasmonics
    • Optical Spectroscopy

    Background:

    • Localized surface plasmon resonances (LSPRs) are crucial for many nanoscale optical phenomena.
    • Characterizing LSPRs in individual nanostructures is essential for understanding their optical properties.
    • Conventional methods often require oblique incidence and linearly polarized light, limiting scalability.

    Purpose of the Study:

    • To demonstrate a novel scheme for characterizing LSPRs in individual metallic nanorods.
    • To utilize a focused radially polarized beam (RPB) for selective excitation of plasmon modes.
    • To offer a scalable and compatible method for nanostructure spectroscopy.

    Main Methods:

    • Employing a focused radially polarized beam (RPB) under normal incidence.
    • Utilizing the unique three-dimensional electric field polarization of the RPB in the focal plane.
    • Scanning the metallic nanorod within the focal plane to excite different plasmon modes.

    Main Results:

    • Achieved selective excitation of dipole and multipole plasmon resonances.
    • Demonstrated mode matching between the RPB electric field and nanorod LSPRs.
    • Showcased the ability to characterize individual nanorods by simple translation.

    Conclusions:

    • The proposed RPB illumination scheme provides an effective way to characterize LSPRs in individual metallic nanorods.
    • This method is compatible with conventional optical microscopy and offers improved scalability compared to existing techniques.
    • The findings enable precise spectroscopic characterization of nanostructures for advanced optical applications.