Strong optical force acting on a dipolar particle over a multilayer substrate

Abstract

Optical forces acting on nano-sized particles are typically too small to be useful for particle manipulation. We theoretically and numerically demonstrate a mechanism that can significantly enhance the optical force acting on a small particle through a special type of resonant particle-substrate coupling. The resonance arises from the singular behavior of the particle's effective polarizablity in the presence of a metal-dielectric-metal multilayer substrate. We show that this phenomenon is closely related to the existence of a flat-band plasmon mode supported by the multilayer substrate.

15 pages, 6 figures

References in corpus (5)

• Light scattering and surface plasmons on small spherical particles
• Lateral Optical Force On Chiral Particles Near a Surface
• Enhancing Optical Gradient Forces with Metamaterials
• Sizable electromagnetic forces in parallel-plate metallic cavity
• Enhancement of polarizabilities of cylinders with cylinder-slab resonances

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• Optical force and torque on small particles induced by polarization singularities
• Optical magnetic dipole levitation using a plasmonic surface
• Inclusion of the backaction term in the total optical force exerted upon Rayleigh particles in nonresonant structures
• Superlens induced loss-insensitive optical force