This first category of problems involves calculations in a very just one- or two-dimensional sub-diffraction restricted gentle confinement. This could involve waveguides, nanowires, or arrays of nanoparticles which help the propagation of floor plasmon polaritons (SPPs) (Fig. 1a) 29. An illustration of a plasmonic waveguide is proven in Ref. thirty: https://genghisd085wdk2.thekatyblog.com/profile