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Modeling highly-focused optical fields and their interactions with spherical targets

ORAL · Invited

Abstract

Highly-focused optical fields (e.g., lasers focused by high-numerical aperture objectives) occur in a wide variety of systems of current interest. Because these fields include light propagating at large angles, such fields cannot be modeled using the typical Hermite-Gaussian or Laguerre-Gaussian expansions commonly employed for modeling laser beams; however, because the light has a distinct direction of propagation, spherical harmonics are also poorly suited to model such a field. I will discuss the construction of bases for modeling highly-focused fields that can be tailored to both the directional spread of the field and its polarization characteristics. Then, I will discuss how these bases can be used to simplify the modeling of interactions between such fields and spherical targets

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Publication: [1] N.J. Moore and M.A. Alonso, "Closed-form bases for the description of monochromatic, strongly focused, electromagnetic fields," J. Opt. Soc. Am. A 26, 2211--2218 (2009).<br><br>[2] N.J. Moore and M.A. Alonso, "Closed form formula for Mie scattering of nonparaxial analogues of Gaussian beams,'' Opt. Express 16, 5926-2933 (2008).<br><br>[3] R. Gutiérrez-Cuevas, N.J. Moore, and M.A. Alonso, "Lorenz-Mie scattering of focused light via complex focus fields: An analytic treatment,'' Phys. Rev. A 97, 053848 (2018).<br><br>[4] Planned: Experimental determination of far-field scattering patterns from micron-sized spheres in modified optical tweezers

Presenters

  • Nicole J. Moore

    Gonzaga University

Authors

  • Nicole J. Moore

    Gonzaga University

  • Miguel A Alonso

    Aix Marseille Univ, CNRS, Centrale Marseille, Institut Fresnel and The Institute of Optics, University of Rochester