Diffraction-Limited Focusing of Plasmonic Wave by a Parabolic Mirror

摘要

We demonstrate effective, up to 30%, reflection of the surface plasmon-polariton wave (SPP) from a nanogroove made on Ag film surface. The use of SPP reflection from a nanogroove having a shape of parabola helps to realize a new element in nanoplasmonics-parabolic SPP mirror. It was found that the mirror allows focusing of the SPP into a diffraction-limited spot with a lateral size of about lambda(SPP) (lambda(SPP) = 800 nm-SPP wavelength). The possibility of spatial scanning the focusing spot of SPP on the surface of Ag film is shown.