Optical force on dielectric nanoparticles placed near an Attenuated Total Reflection structure in Otto configuration

In this work we study the optical force exerted by dielectric nanoparticles placed in the near field of an attenuated total reflection (ATR) structure in Otto configuration containing graphene. We found two angular regions where this force is enhanced, one of this coincides with the critical angle of total internal reflection and the other one coincides with that of the surface plasmons excitation by plane wave incidence. Several different particle shapes are considered (sphere, cylinder and cube) and our results show that the optical force intensity highly depends on these shapes.