Optical forces on resonant metallic cylinders near supertransmitting slits

摘要

We study the optical forces on 2D metallic particles, i. e. infinite cylinders, in or out their Mie resonances, near a subwavelength slit in extraordinary transmission regime, illuminated by a Gaussian beam. We show that the presence of the slit enhances by two orders of magnitude the transversal forces of optical tweezers from a beam alone. We demonstrate an enhancement forces, also of binding nature, at plasmon resonance wavelengths on metallic nanocylinders. The role of both scattering and gradient forces are addressed, for the particles at either the exit or entrance of the slit, regarding the bonding or antibonding nature of the overall force on them.