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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 6 — Mar. 19, 2007
  • pp: 3478–3487

Optical antenna arrays in the visible range

Daniel R. Matthews, Huw D. Summers, Kerenza Njoh, Sally Chappell, Rachel Errington, and Paul Smith  »View Author Affiliations

Optics Express, Vol. 15, Issue 6, pp. 3478-3487 (2007)

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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.

© 2007 Optical Society of America

OCIS Codes
(030.1670) Coherence and statistical optics : Coherent optical effects
(050.2770) Diffraction and gratings : Gratings
(240.6680) Optics at surfaces : Surface plasmons

ToC Category:
Optics at Surfaces

Original Manuscript: October 3, 2006
Revised Manuscript: January 11, 2007
Manuscript Accepted: January 16, 2007
Published: March 19, 2007

Daniel R. Matthews, Huw D. Summers, Kerenza Njoh, Sally Chappell, Rachel Errington, and Paul Smith, "Optical antenna arrays in the visible range," Opt. Express 15, 3478-3487 (2007)

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