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Plasmonics

, Volume 13, Issue 6, pp 2021–2027 | Cite as

Enhanced Directed Radiative Surface Plasmon Emission from Periodically Corrugated Noble Metal Films

  • Helmut Neff
  • Leiva Casemiro Oliveira
  • Eloise Passos Rodrigures
  • Carsten Thirstrup
  • Antonio Marcus Nogueira Lima
Article

Abstract

Massively enhanced directed radiation emission from periodically corrugated thin gold and silver films at the surface plasmon resonance is reported. The optical setup comprises attenuated total reflection in a modified Kretschmann configuration, with the semi-transparent metal films placed at the base plate of a polymeric semi-cylinder. Experiments performed at a fixed wavelength confirm earlier observations on appearance of two symmetrically arranged first-order diffraction beams. These emanate under resonance conditions into the upper and lower half-spaces, the latter due to coupling of the non-radiating surface plasmon to an angularly directed radiative mode. Collimated incident and spectrally broadband radiation under resonance conditions likewise split into two symmetrically arranged first-order, but spectrally dispersed continuous, diffraction beams. For silver, unlike smooth metal films, the non-radiative surface plasmon (SP) also splits into two spectrally separated resonance dips at 550 and 700 nm. The spectral continuum in the SP-mediated radiative beam in the lower half-space resembles the complementary color feature of the absorbing SP-mode. Its intensity exceeds the isotropic radiative plasmon emission from smooth, weakly roughened SP-active gold metal layers by at least two orders of magnitude.

Keywords

Surface plasmon resonance Radiative emission Mode coupling Corrugated metal films 

Notes

Acknowledgements

The financial support by CNPQ and CAPES is gratefully acknowledged.

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Graduate Program for Electrical Engineering, Center for Electrical Engineering and Informatics, Department of Electrical EngineeringUniversidade Federal de Campina GrandeCampina GrandeBrazil
  2. 2.Center of Exact and Natural Sciences Department of Computer ScienceUniversidade Federal Rural do Semi-Árido (Federal Rural University for the Semi-Arid Region) MossoróMossoróBrazil
  3. 3.Danish National Metrology InstituteKongens LyngbyDenmark

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