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  1. AU="Chalifour, Matthieu"
  2. AU="Cannon, B. E."
  3. AU="Seibert, Julie"
  4. AU="Nazrul Islam"
  5. AU="Qadir, Syed Saeed"
  6. AU="Koutsoukos, Marguerite"
  7. AU="Webster, Kara"
  8. AU=Tremoulet Adriana H.
  9. AU="Foggia, Maria"
  10. AU=Eccles Michael R
  11. AU="Karrison, Theodore"
  12. AU="Espigado, I"
  13. AU="Dean, Andrew"

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  1. Artikel ; Online: Optical polarization analogs in inelastic free-electron scattering.

    Bourgeois, Marc R / Nixon, Austin G / Chalifour, Matthieu / Masiello, David J

    Science advances

    2023  Band 9, Heft 51, Seite(n) eadj6038

    Abstract: Advances in the ability to manipulate free-electron phase profiles within the electron microscope have spurred development of quantum-mechanical descriptions of electron energy loss (EEL) processes involving transitions between phase-shaped transverse ... ...

    Abstract Advances in the ability to manipulate free-electron phase profiles within the electron microscope have spurred development of quantum-mechanical descriptions of electron energy loss (EEL) processes involving transitions between phase-shaped transverse states. Here, we elucidate an underlying connection between two ostensibly distinct optical polarization analogs identified in EEL experiments as manifestations of the same conserved scattering flux. Our work introduces a procedure for probing general tensorial target characteristics including global mode symmetries and local polarization.
    Sprache Englisch
    Erscheinungsdatum 2023-12-20
    Erscheinungsland United States
    Dokumenttyp Journal Article
    ZDB-ID 2810933-8
    ISSN 2375-2548 ; 2375-2548
    ISSN (online) 2375-2548
    ISSN 2375-2548
    DOI 10.1126/sciadv.adj6038
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  2. Artikel ; Online: Polarization-Resolved Electron Energy Gain Nanospectroscopy With Phase-Structured Electron Beams.

    Bourgeois, Marc R / Nixon, Austin G / Chalifour, Matthieu / Beutler, Elliot K / Masiello, David J

    Nano letters

    2022  Band 22, Heft 17, Seite(n) 7158–7165

    Abstract: Free-electron-based measurements in scanning transmission electron microscopes (STEMs) reveal valuable information on the broadband spectral responses of nanoscale systems with deeply subdiffraction limited spatial resolution. Leveraging recent advances ... ...

    Abstract Free-electron-based measurements in scanning transmission electron microscopes (STEMs) reveal valuable information on the broadband spectral responses of nanoscale systems with deeply subdiffraction limited spatial resolution. Leveraging recent advances in manipulating the spatial phase profile of the transverse electron wavefront, we theoretically describe interactions between the electron probe and optically stimulated nanophotonic targets in which the probe gains energy while simultaneously transitioning between transverse states with distinct phase profiles. Exploiting the selection rules governing such transitions, we propose phase-shaped electron energy gain nanospectroscopy for probing the 3D polarization-resolved response field of an optically excited target with nanoscale spatial resolution. Considering ongoing instrumental developments, polarized generalizations of STEM electron energy loss and gain measurements hold the potential to become powerful tools for fundamental studies of quantum materials and their interaction with nearby nanostructures supporting localized surface plasmon or phonon polaritons as well as for noninvasive imaging and nanoscale 3D field tomography.
    Mesh-Begriff(e) Electrons ; Microscopy/methods ; Nanostructures/chemistry
    Sprache Englisch
    Erscheinungsdatum 2022-08-29
    Erscheinungsland United States
    Dokumenttyp Journal Article ; Research Support, U.S. Gov't, Non-P.H.S.
    ISSN 1530-6992
    ISSN (online) 1530-6992
    DOI 10.1021/acs.nanolett.2c02375
    Datenquelle MEDical Literature Analysis and Retrieval System OnLINE

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  3. Artikel: Lattice Kerker Effect with Plasmonic Oligomers

    Bourgeois, Marc R. / Rossi, Andrew W. / Chalifour, Matthieu / Cherqui, Charles / Masiello, David J.

    Journal of physical chemistry. 2021 Aug. 19, v. 125, no. 34

    2021  

    Abstract: The lattice Kerker effect refers to a strong suppression of reflected light from periodic arrays of scatterers in narrow spectral windows at normal incidence. It can occur when interference of scattered light from different multipolar modes from each ... ...

    Abstract The lattice Kerker effect refers to a strong suppression of reflected light from periodic arrays of scatterers in narrow spectral windows at normal incidence. It can occur when interference of scattered light from different multipolar modes from each unit cell and diffractive coupling among unit cells occur simultaneously. Here we investigate manifestations of the lattice Kerker effect in 1D arrays of planar plasmonic oligomer trimers. Numerical results computed using a coupled electric dipole model for 1D non-Bravais trimer arrays, where the three constituent particles in each trimer unit cell are explicitly included, are rationalized using a coupled electric and magnetic dipole model on a 1D Bravais lattice. This model allows the differential scattered power angular distributions from the array to be decomposed into the product of the angular distribution produced by a single unit cell containing colocalized electric and magnetic dipoles and the squared modulus of a structure factor accounting for diffraction arising from the periodic array. In addition to providing an intuitive explanation for characteristic signatures of the lattice Kerker effect at normal incidence, this model also enables the facile evaluation of angular scattered power distributions for non-normal angles of incidence. The results of this work expand the concept of the lattice Kerker effect in terms of both unit cell design and excitation conditions and provide a simple analytic model for designing periodic structures with engineered properties for applications in nanophotonics concerned with highly directional radiation beaming and enhanced magnetic field strengths at optical frequencies.
    Schlagwörter magnetic fields ; models ; physical chemistry
    Sprache Englisch
    Erscheinungsverlauf 2021-0819
    Umfang p. 18817-18826.
    Erscheinungsort American Chemical Society
    Dokumenttyp Artikel
    ISSN 1932-7455
    DOI 10.1021/acs.jpcc.1c05024
    Datenquelle NAL Katalog (AGRICOLA)

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