Optical magnetic dipole levitation using a plasmonic surface

TY - JOUR

T1 - Optical magnetic dipole levitation using a plasmonic surface

AU - Kingsley-Smith, Jack

AU - Picardi, Michela

AU - Rodriguez Fortuno, Francisco

PY - 2020/10/14

Y1 - 2020/10/14

N2 - 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.

AB - 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.

KW - magnetic dipole

KW - metamaterials

KW - nanoparticles

KW - optical magnetism

KW - optical manipulation

UR - http://www.scopus.com/inward/record.url?scp=85092945161&partnerID=8YFLogxK

U2 - 10.1021/acs.nanolett.0c02313

DO - 10.1021/acs.nanolett.0c02313

M3 - Letter

SN - 1530-6984

VL - 20

SP - 7094

EP - 7099

JO - Nano Letters

JF - Nano Letters

IS - 10

ER -