Journal
LASER & PHOTONICS REVIEWS
Volume 10, Issue 1, Pages 116-122Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/lpor.201500173
Keywords
surface plasmon-polariton; tractor beam; optical pulling force; spin-orbit coupling; optical spin Hall effect
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Funding
- Government of the Russian Federation [074-U01]
- Russian Fund for Basic Research [15-02-01344, 16-37-60064, 14-02-01223]
- Russian Science Foundation [14-12-01227]
- NSF [1159530]
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We demonstrate both analytically and numerically the existence of optical pulling forces acting on particles located near plasmonic interfaces. Two main factors contribute to the appearance of this negative recoil force. The interference between the incident and reflected waves induces a rotating dipole with an asymmetric scattering pattern, while the directional excitation of surface plasmon polaritons (SPPs) enhances the linear momentum of scattered light. The strongly asymmetric SPP excitation is determined by spin-orbit coupling of the rotating dipole and surface plasmon polariton. As a result of the total momentum conservation, the force acting on the particle points in a direction opposite to the incident wave propagation. We derive analytical expressions for the force acting on dipolar particles placed in the proximity of plasmonic surfaces. Analytical expressions for this pulling force are derived within the dipole approximation and are in excellent agreement with results of electromagnetic numerical calculations. The forces acting on larger particles are analyzed numerically, beyond the dipole approximation.
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