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19 April 2024 |
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Article overview
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Tailoring multipolar Mie scattering with helicity and angular momentum | | Xavier Zambrana-Puyalto
; Xavier Vidal
; Pawel Wozniak
; Peter Banzer
; Gabriel Molina-Terriza
; | | Date: |
19 Feb 2018 | | 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 $4mu m$ TiO$_2$ 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. | | Source: | arXiv, 1802.6824 | | Services: | Forum | Review | PDF | Favorites | |
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