Reference:
http://www.nature.com/srep/2012/121025/srep00771/full/srep00771.html#supplementary-information *Spontaneous knotting of self-trapped waves* http://phys.org/news/2012-10-beautiful-physics-tying.html *Beautiful physics: Tying knots in light* These references show how light rings can form under special optical conditions. The theory of anapole magnetic weak force nuclear activation is predicated on the formation of light rings forming in the hot spots caused by polariton formation on the edges between nanoparticles The bottom line for this post, light ring plasmoid formation is possible.
