Optics and Photonics Society of Iran

In this paper, the attractive and repulsive optical forces in the truncated V-shaped 77◦ plasmonic gold waveguide have been investigated. By changing the coating layers material and consequently the amount of trapped light energy in bottom of the waveguide, the applied optical forces on metal and plasmonic nanoparticles has been obtained with using the Maxwell stress tensor method. Our results show that by using a coating layer of suitable material, the optical forces increase compared to the uncoated waveguide. In the best situation, the structure which has a silicon nitride coating layer, a plasmonic nanoparticles consisting of gold and titanium dioxide moved to the top of the structure from the end of grooves by a single-wavelength plane wave with an intensity of 1 w/um². After reaching nanoparticles to the top of the waveguide according to changing the spatial distribution of the electric field intensity which alters the gradient electric field and nanoparticle Polarization Consequently, the sign of optical forces is change and it Prevent the nanoparticle move to the outside of the waveguide and again it will move to the bottom of the waveguide.