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The recoil optical force that acts on emitters near a surface or waveguiderelies on near-field directionality and conservation of momentum. It featuresdesirable properties uncommon in optical forces, such as the ability to produceit via wide-area illumination of vast numbers of particles without the need forfocusing, or being dynamically switchable via the polarization of light.Unfortunately, these recoil forces are usually very weak and have not beenexperimentally observed in small dipolar particles. Some works theoreticallydemonstrate orders-of-magnitude enhancement of these forces via complexnano-structuring involving hyperbolic surfaces or metamaterials, complicatingthe fabrication and experimental demonstration. In this work, we theoreticallyand numerically show enhancement of the lateral recoil force by simply usingthin metallic films, which support ultra-high-momentum plasmonic modes. Thehigh-momentum carried by these modes impart a correspondingly large recoilforce on the dipole, enhancing the force by several orders of magnitude in aremarkably simple geometry, bringing it closer to practical applications.

Enhancement of recoil optical forces via high-k plasmons on thin metallic films