Optica Open
Browse

Asymmetric scattering of mirror symmetric radiation from nanostructures coupled to chiral films

Download (5.58 kB)
preprint
posted on 2023-01-12, 14:08 authored by Alessandro Ciattoni
The interaction of radiation with chiral molecular films is not macroscopically invariant under mirror reflections and, accordingly, chiroptical effects exist which affect the spatial symmetry of the radiation profile and which nearly exclusively show up in the near-field due to the large molecule-wavelength size mismatch. Here we prove that the scattering of a mirror symmetric pair of plane waves by a nanowire lying on a chiral nanofilm is not mirror symmetric with an angular dissymmetry factor that can be as large as some tenths. Due to evanescent coupling, the nanowire efficiently experiences molecular chirality which produces a spatially asymmetric near-field so that the self-consistent unbalanced excitation of nanowire photonic modes with opposite angular momenta yields asymmetric far-field interference. In addition to enriching the physical understaning of mirror symmetry breaking in chiral nanophotonics, our results could suggest ultra-efficient schemes for enantiomeric discrimination which is essential in biological chemistry and pharmacology.

History

Disclaimer

This arXiv metadata record was not reviewed or approved by, nor does it necessarily express or reflect the policies or opinions of, arXiv.

Usage metrics

    Categories

    Licence

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC