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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 24 — Nov. 19, 2012
  • pp: 26725–26735

Modulation of nanocavity plasmonic emission by local molecular states of C60 on Au(111)

Feng Geng, Yang Zhang, Yunjie Yu, Yanmin Kuang, Yuan Liao, Zhenchao Dong, and Jianguo Hou  »View Author Affiliations

Optics Express, Vol. 20, Issue 24, pp. 26725-26735 (2012)

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We investigate the modulation of C60 monolayers on the nanocavity plasmonic (NCP) emission on Au(111) by tunneling electron excitation from a scanning tunneling microscope (STM) tip. STM induced luminescence spectra show not only suppressed emission, but also significant redshift of NCP emission bands on the C60 molecules relative to the bare metal surface. The redshift, together with the bias- and coverage-dependent emission feature, indicates that the C60 molecules act beyond a pure dielectric spacer, their electronic states are heavily involved in the inelastic tunneling process for plasmonic emission. A modified quantum cutoff relation is proposed to explain qualitatively the observed emission feature at both bias polarities. We also demonstrate molecularly resolved optical contrast on the C60 monolayer and discuss the contrast mechanism briefly.

© 2012 OSA

OCIS Codes
(180.5810) Microscopy : Scanning microscopy
(240.6680) Optics at surfaces : Surface plasmons
(240.7040) Optics at surfaces : Tunneling
(260.2160) Physical optics : Energy transfer
(300.6280) Spectroscopy : Spectroscopy, fluorescence and luminescence
(250.5403) Optoelectronics : Plasmonics

ToC Category:

Original Manuscript: October 8, 2012
Revised Manuscript: November 5, 2012
Manuscript Accepted: November 5, 2012
Published: November 12, 2012

Feng Geng, Yang Zhang, Yunjie Yu, Yanmin Kuang, Yuan Liao, Zhenchao Dong, and Jianguo Hou, "Modulation of nanocavity plasmonic emission by local molecular states of C60 on Au(111)," Opt. Express 20, 26725-26735 (2012)

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