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    We found that nanoantennas with multipolar resonances enhance circular dichroism in chiral materials. This suggests multipolar radiative coupling is key for strong chiral responses, aiding in enantiomeric sensing and metamaterial design.

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    Area of Science:

    • Plasmonics and Nanophotonics
    • Chiroptical Spectroscopy
    • Metamaterials

    Background:

    • Chiral media exhibit circular dichroism (CD), a differential absorption of left and right circularly polarized light.
    • Nanoantennas can enhance light-matter interactions, but the mechanism for surface-enhanced CD (SECD) near them is not fully understood.
    • Understanding SECD is crucial for developing advanced optical devices.

    Purpose of the Study:

    • To numerically investigate the mechanism behind surface-enhanced circular dichroism (SECD) of chiral media near nanoantennas.
    • To identify the primary factors contributing to strong SECD.
    • To propose a mechanism for the observed SECD enhancement.

    Main Methods:

    • Numerical simulations of chiral media interacting with nanoantennas.
    • Analysis of optical responses, focusing on circular dichroism.
    • Correlation of SECD with nanoantenna resonances, near-field enhancement, and optical helicity enhancement.

    Main Results:

    • Strong circular dichroism was observed in chiral media surrounding nanoantennas exhibiting multipolar resonant modes.
    • The observed SECD was more strongly correlated with multipolar resonances than with near-field or optical helicity enhancement.
    • Multipolar radiative coupling between nanoantennas and the chiral medium is proposed as the dominant mechanism.

    Conclusions:

    • Multipolar resonances of nanoantennas play a critical role in enhancing circular dichroism in adjacent chiral media.
    • Multipolar radiative coupling is identified as a key mechanism for strong surface-enhanced chiral responses.
    • This research provides insights for designing enantiomeric-sensing platforms and advanced chiral metamaterials.