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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 22 — Nov. 4, 2013
  • pp: 27452–27459

The role of gap plasmons in light emission from tunnel junctions

Shawn Divitt, Palash Bharadwaj, and Lukas Novotny  »View Author Affiliations

Optics Express, Vol. 21, Issue 22, pp. 27452-27459 (2013)

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Light emission from the junction of a scanning tunneling microscope (STM) is examined in the presence of 20 nm topographical features in thin gold films. These features significantly modify the emission rates of the junction. Contributions to this modification are discriminated by examining emission rates on samples where the material is varied spatially. It is found that the variability in STM photoemission rates between a gold tip and a gold sample under ambient conditions is due to the modification of localized gap plasmon modes and not to the presence of an electroluminescent gold cluster on the STM probe apex.

© 2013 OSA

OCIS Codes
(240.7040) Optics at surfaces : Tunneling
(300.2140) Spectroscopy : Emission
(250.5403) Optoelectronics : Plasmonics

ToC Category:

Original Manuscript: August 6, 2013
Revised Manuscript: September 21, 2013
Manuscript Accepted: September 23, 2013
Published: November 4, 2013

Virtual Issues
Surface Plasmon Photonics (2013) Optics Express

Shawn Divitt, Palash Bharadwaj, and Lukas Novotny, "The role of gap plasmons in light emission from tunnel junctions," Opt. Express 21, 27452-27459 (2013)

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