Probing the backscattering of TiO2particles with vortex beams

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

doi:10.1117/12.2555460

Probing the backscattering of TiO₂particles with vortex beams

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

Research output: Chapter in Book/Report/Conference proceeding › Conference proceeding contribution › peer-review

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Abstract

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 language	English
Title of host publication	Nanophotonics VIII
Editors	David L. Andrews, Angus J. Bain, Martti Kauranen, Jean-Michel Nunzi
Place of Publication	Bellingham, Washington
Publisher	SPIE
Pages	1134507-1-1134507-9
Number of pages	9
ISBN (Electronic)	9781510634633
ISBN (Print)	9781510634626
DOIs	https://doi.org/10.1117/12.2555460
Publication status	Published - 2020
Event	Nanophotonics VIII 2020 - Virtual, Online, France Duration: 6 Apr 2020 → 10 Apr 2020

Publication series

Name	Proceedings of SPIE
Publisher	SPIE
Volume	11345
ISSN (Print)	0277-786X
ISSN (Electronic)	1996-756X

Conference

Conference	Nanophotonics VIII 2020
Country/Territory	France
City	Virtual, Online
Period	6/04/20 → 10/04/20

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.

Keywords

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

Access to Document

10.1117/12.2555460

Publisher version (open access)Final published version, 603 KBLicence: Other

Cite this

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title = "Probing the backscattering of TiO2particles with vortex beams",

abstract = "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. ",

keywords = "Angular momentum, Helicity, Mie Theory, Multipoles, Phase singularity, Vortex beams, Whispering gallery modes",

author = "Xavier Zambrana-Puyalto and Xavier Vidal and Gabriel Molina-Terriza",

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.; Nanophotonics VIII 2020 ; Conference date: 06-04-2020 Through 10-04-2020",

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Zambrana-Puyalto, X, Vidal, X & Molina-Terriza, G 2020, Probing the backscattering of TiO₂particles with vortex beams. in DL Andrews, AJ Bain, M Kauranen & J-M Nunzi (eds), Nanophotonics VIII., 1134507, Proceedings of SPIE, vol. 11345, SPIE, Bellingham, Washington, pp. 1134507-1-1134507-9, Nanophotonics VIII 2020, Virtual, Online, France, 6/04/20. https://doi.org/10.1117/12.2555460

Probing the backscattering of TiO₂particles with vortex beams. / Zambrana-Puyalto, Xavier; Vidal, Xavier; Molina-Terriza, Gabriel.

Nanophotonics VIII. ed. / David L. Andrews; Angus J. Bain; Martti Kauranen; Jean-Michel Nunzi. Bellingham, Washington : SPIE, 2020. p. 1134507-1-1134507-9 1134507 (Proceedings of SPIE; Vol. 11345).

Research output: Chapter in Book/Report/Conference proceeding › Conference proceeding contribution › peer-review

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N2 - 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.

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