Tailoring multipolar Mie scattering with helicity and angular momentum

Xavier Zambrana-Puyalto, Xavier Vidal Asensio, Paweł Woźniak, Peter Banzer, Gabriel Molina-Terriza

    Research output: Contribution to journalArticlepeer-review

    18 Citations (Scopus)

    Abstract

    Linear scattering processes are usually described as a function of the parameters of the incident beam. The wavelength, the intensity distribution, the polarization or the phase are among them. Here, we discuss and experimentally demonstrate how the angular momentum and the helicity of light influence the light scattering of spherical particles. We measure the backscattering of a 4 μm diameter TiO₂ single particle deposited on a glass substrate. The particle is probed at different wavelengths by different beams with total angular momenta ranging from −8 to +8 units. It is observed that the spectral behavior of the particle is highly dependent on the angular momentum and helicity of the incoming beam. While some of the properties of the scattered field can be described with a simple resonator model, the scattering of high angular momentum beams requires a deeper understanding of the multipolar modes induced in the sphere. We observe that tailoring these induced multipolar modes can cause a shift and a spectral narrowing of the peaks of the scattering spectrum. Furthermore, specific combinations of helicity and angular momentum for the excitation lead to differences in the conservation of helicity by the system, which has clear consequences on the scattering pattern.
    Original languageEnglish
    Pages (from-to)2936–2944
    Number of pages9
    JournalACS Photonics
    Volume5
    Issue number7
    DOIs
    Publication statusPublished - 17 May 2018

    Keywords

    • angular momentum
    • backscattering
    • helicity
    • Mie theory
    • multipole
    • whispering gallery mode

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