Abstract
Optical tweezers performance is investigated when the Gaussian beam is focused on the metal substrate with the subwavelength particle. Green's function is used to build analytical formalism underlining surface plasmon contribution to the optical force. Excitation of surface plasmon affects optical forces with significant impact at the surface plasmon resonance condition. At the next step the field and force are reconfigured by defocusing beam relative to the substrate. When the beam is focused above the substrate optical force increases about an order of magnitude due to evanescent field of surface plasmon. Novel effect of repulsion from Gaussian beam (“anti-trapping”) is obtained when the beam waist is moved below the substrate which is confirmed by both the analytical approach and finite element simulation. Anti-trapping of subwavelength dielectric particle can be applied for sorting of different-sized particles identical by shape and composition.
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