Physics – Condensed Matter – Other Condensed Matter
Scientific paper
2007-03-15
Nature Phys. 3, 324 (2007)
Physics
Condensed Matter
Other Condensed Matter
13 pages, 4 figures
Scientific paper
10.1038/nphys584
Plasmonics is based on surface plasmon polariton (SPP) modes which can be laterally confined below the diffraction limit, thereby enabling ultracompact optical components. In order to exploit this potential, the fundamental bottleneck of poor light-SPP coupling must be overcome. In established SPP sources (using prism, grating} or nanodefect coupling) incident light is a source of noise for the SPP, unless the illumination occurs away from the region of interest, increasing the system size and weakening the SPP intensity. Back-side illumination of subwavelength apertures in optically thick metal films eliminates this problem but does not ensure a unique propagation direction for the SPP. We propose a novel back-side slit-illumination method based on drilling a periodic array of indentations at one side of the slit. We demonstrate that the SPP running in the array direction can be suppressed, and the one propagating in the opposite direction enhanced, providing localized unidirectional SPP launching.
Bozhevolnyi Sergey I.
Dereux Alain
Devaux Eloïse
Ebbesen Thomas W.
Garcia-Vidal Francisco J.
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