Optical antenna arrays in the visible range

Daniel R. Matthews, Huw D. Summers, Kerenza Njoh, Sally Chappell, Rachel Errington, Paul Smith

Research output: Contribution to journalArticlepeer-review

19 Scopus citations


We report on experimental observations of highly collimated beams of radiation generated when a periodic sub-wavelength grating interacts with surface bound plasmon-polariton modes of a thin gold film. We find that the radiation process can be fully described in terms of interference of emission from a dipole antenna array and modeling the structure in this way enables the far-field radiation pattern to be predicted. The directionality, multiplicity and divergence of the beams can be completely described within this framework. Essential to the process are the surface plasmon excitations: these are the driving mechanism behind the beam formation, phase-coupling radiation from the periodic surface structure and thus imposing a spatial coherence. Detailed fitting of the experimental and modeled data indicates the presence of scattering events involving the interaction of two surface plasmon polariton modes.

Original languageEnglish (US)
Pages (from-to)3478-3487
Number of pages10
JournalOptics Express
Issue number6
StatePublished - Mar 19 2007

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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