Figure 1: (Color online) Optical guiding with a symmetric slitgroove along a linear trajectory. (a) Schematic of the silver slitgroove. nm, nm, nm, and nm. The film is immersed in water (). The structure is extended in the -direction. The optimal geometry for beaming was determined by numerical simulations. (b) Electric field intensity obtained from a numerical simulation. (c) Optical force for a dielectric particle ( μm, ) located at μm. The force magnitude is normalized to the transmitted power (through the slit) of 10 mW/μm in the -direction. (d) Optical force as a function of the particle diameter. The particle is located at μm, μm. (e) Optical force vector map.