Based on recent advancements of nanofabrication technologies, plasmon resonance has attracted much interest. This phenomenon has been applied to biosensors, highly efficient solar power converters, nanooptical components and so on. Recently, this research field is called as “Plasmonics”, and has been broadened among the world. We have been focused on the relationship between plasmon resonance and electron field emission. We found so-called “Plasmon assisted field emission”, which is expected as a novel photocathode. We are pursuing this principle in depth and applying it to the novel massively-parallel optically-controlled filed emitter arrays. Please also look at a document Iwami_TT_E.pdf(521) for your information.