Generation of Subwavelength Plasmonic Nanovortices via Helically Corrugated Metallic Nanowires.

ABSTRACT: We demonstrate that plasmonic helical gratings consisting of metallic nanowires imprinted with helical grooves or ridges can be used efficiently to generate plasmonic vortices with radius much smaller than the operating wavelength. In our proposed approach, these helical surface gratings are designed so that plasmon modes with different azimuthal quantum numbers (topological charge) are phase-matched, thus allowing one to generate optical plasmonic vortices with arbitrary topological charge. The general principles for designing plasmonic helical gratings that facilitate efficient generation of such plasmonic vortices are derived and their applicability to the conversion of plasmonic vortices with zero angular momentum into plasmonic vortices with arbitrary angular momentum is illustrated i

SUBMITTER: Huang C 

PROVIDER: S-EPMC4538392 | biostudies-literature | 2015 Aug

REPOSITORIES: biostudies-literature