'Plasmonics' in free space: observation of giant wavevectors, vortices and energy backflow in superoscillatory optical fields

Guang Hui Yuan, Edward T. F. Rogers, Nikolay I. Zheludev

Evanescent light can be localized at the nanoscale by resonant absorption in a plasmonic nanoparticle or taper or by transmission through a nanohole. However, a conventional lens c…