Pasmonic system’s that are described by the laws of quantum mechanics and the continuity of the wave function dictate that circulating flows assume quantized values called vortices.
The surprising revelation of this recently publish referenced research is that vortexes form outside of the plasmonic excitation points. In a Nanoplasmonic system the excitation points are topological discontinuities formed by extreme curvatures of nanoparticles surfaces: For example, at the tips of nanowires. A dense vortex lattice is formed in a polariton system. http://www.np.phy.cam.ac.uk/uploads/2012/natcomm12-condvortices.pdf *Geometrically locked vortex lattices in semiconductor quantum fluids*
