Probing the backscattering of TiO2particles with vortex beams

Xavier Zambrana-Puyalto, Xavier Vidal, Gabriel Molina-Terriza

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We present a set of experiments in which the backscattering spectra of 4 μm single TiO2 particles are probed with circularly polarized vortex beams. The experiment is carried out with a tunable laser at λ = 760 - 810nm. We observe that the use of vortex beams enables us to tailor the backscattering in different ways. Given a certain backscattering of a particle (induced by a Gaussian beam or a plane wave), we observe that vortex beams can tune it and sharpen it. Moreover, we also observe that the level of conservation of helicty can be increased thanks to the use of vortex beams. We explain the mechanisms that give rise to these effects using Mie Theory. Our method of backscattering control can be experimentally implemented in most of microscopy set-ups. In addition, if brought to its limits, the method can be used to excite single multipolar modes from spheres. We believe that our method could find application in the levitation of particles or the excitation of whispering gallery modes.

Original languageEnglish
Title of host publicationNanophotonics VIII
EditorsDavid L. Andrews, Angus J. Bain, Martti Kauranen, Jean-Michel Nunzi
Place of PublicationBellingham, Washington
Number of pages9
ISBN (Electronic)9781510634633
ISBN (Print)9781510634626
Publication statusPublished - 2020
EventNanophotonics VIII 2020 - Virtual, Online, France
Duration: 6 Apr 202010 Apr 2020

Publication series

NameProceedings of SPIE
ISSN (Print)0277-786X
ISSN (Electronic)1996-756X


ConferenceNanophotonics VIII 2020
CityVirtual, Online

Bibliographical note

Copyright 2020 Society of Photo-Optical Instrumentation Engineers (SPIE). One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.


  • Angular momentum
  • Helicity
  • Mie Theory
  • Multipoles
  • Phase singularity
  • Vortex beams
  • Whispering gallery modes


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