Multipole engineering of attractive-repulsive and bending optical forces
Entity
UAM. Departamento de Física de MaterialesPublisher
Wiley-VCH VerlagDate
2021-07-16Citation
10.1002/adpr.202100082
Advanced Photonics Research 2.9 (2021): 2100082
ISSN
2699-9293DOI
10.1002/adpr.202100082Project
Gobierno de España. CEX2018-000805-M; info:eu-repo/grantAgreement/EC/H2020/802279/ERC//In MotionEditor's Version
https://doi.org/10.1002/adpr.202100082Subjects
Multipole Decompositions; Optical Tweezers; Quadrupole Optical Forces; Silicon Nanoparticles; Transversal Antitrapping; FísicaRights
© 2021 The AuthorsAbstract
Focused laser beams allow controlling the mechanical motion of objects and can
serve as a tool for assembling micro and nanostructures in space. While small
particles mainly experience attractive gradient forces and repulsive radiation
pressure, introducing additional flexibility suggests approaching new capabilities.
Herein, optical forces acting on a high refractive index sphere in a focused
Gaussian beam are analyzed and new regimes are revealed. Multipolar analysis
allows separating an optical force into interception and recoil components,
resulting in different mechanical actions. In particular, interplaying interception
radial forces and multipolar resonances within a particle can lead to either trapping
or antitrapping, depending on the system parameters. At the same time, the recoil
force generates a significant azimuthal component along with an angulardependent radial force. Those contributions enable enhancing either trapping or
antitrapping and also introduce bending reactions. These effects are linked to the
far-field multipole interference and, specifically, to asymmetric scattering patterns.
The latter approach is extremely useful, as it allows assessing the nature of
optomechanical motion by observing far-fields. Multipolar engineering of optical
forces, being quite a general approach, is not necessarily linked to simple spherical
shapes and paves a way to new possibilities in microfluidic applications, including
sorting and microassembly
Files in this item
Google Scholar:Kislov, Denis A.
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Gurvitz, Egor A.
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Bobrovs, Vjaceslavs
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Pavlov, Alexander A.
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Redka, Dmitrii N.
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Marqués Ponce, Manuel Ignacio
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Ginzburg, Pavel
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Shalin, Alexander S.
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