Directional excitation of surface plasmon polaritons via nanoslits under varied incidence observed using leakage radiation microscopy

Yannick Sonnefraud, Sarp Kerman, Giuliana Di Martino, Dangyuan Lei, Stefan A. Maier

Research output: Journal article publicationJournal articleAcademic researchpeer-review

30 Citations (Scopus)


Surface Plasmon Polaritons (SPPs) are excited at the interface between a thin gold film and air via the illumination of nanoslits etched into the film. The coupling efficiency to the two propagation directions away from the slits is determined by leakage radiation microscopy, when the angle of incidence of the pump beam is changed from 0°to 20°. We find that preferential coupling of SPPs into one direction can be achieved for non-normal incidence in the case of single slits and slit pairs. The proportion of SPP excited into one direction can be in excess of 90%. We further provide a simple model of the process, and directly compare the performances of the two approaches.
Original languageEnglish
Pages (from-to)4893-4902
Number of pages10
JournalOptics Express
Issue number5
Publication statusPublished - 27 Feb 2012
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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