Since its inception, the nanotechnology working group at the European Patent Office has been constantly updating the
content of its different nanotechnology classification tags which it applies to patent publications worldwide. The main
technologies in the nanophotonics area are photonic crystals, surface plasmon devices, semiconductor superlattices and
scanning near-field microscopy. Some patent statistics are shown and a brief summary of legal issues is given.
"Nanophotonics technology watch at the European Patent Office", Proc. SPIE 6988, Nanophotonics II, 69880W (23 April 2008); doi: 10.1117/12.781198; https://doi.org/10.1117/12.781198