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Optical magnetic dipole levitation using a plasmonic surface

Research output: Contribution to journalLetter

Original languageEnglish
Pages (from-to)7094-7099
Number of pages6
JournalNano Letters
Volume20
Issue number10
DOIs
Accepted/In press24 Aug 2020
Published14 Oct 2020

Documents

  • nl-2020-02313r.v3

    nl_2020_02313r.v3.pdf, 1.6 MB, application/pdf

    Uploaded date:18 Aug 2020

    Version:Accepted author manuscript

King's Authors

Abstract

Optically induced magnetic resonances in nonmagnetic media have unlocked magnetic light-matter interactions and led to new technologies in many research fields. Previous proposals for the levitation of nanoscale particles without structured illumination have worked on the basis of epsilon-near-zero surfaces or anisotropic materials, but these materials carry with them significant fabrication difficulties. We report the optical levitation of a magnetic dipole over a wide range of realistic materials, including bulk metals, thereby relieving these difficulties. The repulsion is independent of surface losses, and we propose an experiment to detect this force which consists of a core-shell nanoparticle, exhibiting a magnetic resonance, in close proximity to a gold substrate under plane wave illumination. We anticipate the use of this phenomenon in new nanomechanical devices.

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