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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 18, Iss. 13 — Jun. 21, 2010
  • pp: 14232–14237

Ultrafast spatiotemporal relaxation dynamics of excited electrons in a metal nanostructure detected by femtosecond-SNOM

Zhi Li, Song Yue, Jianjun Chen, and Qihuang Gong  »View Author Affiliations

Optics Express, Vol. 18, Issue 13, pp. 14232-14237 (2010)

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Ultrahigh spatiotemporal resolved pump-probe signal near a gold nano-slit is detected by femtosecond-SNOM. By employing two-color pump-probe configuration and probing at the interband transition wavelength of the gold, signal contributed by surface plasmon polariton is avoided and spatiotemporal evolvement of excited electrons is successfully observed. From the contrast decaying of the periodical distribution of the pump-probe signal, ultrafast diffusion of excited electrons with a time scale of a few hundred femtoseconds is clearly identified. For comparison, such phenomenon cannot be observed by the one-color pump-probe configuration.

© 2010 OSA

OCIS Codes
(240.6680) Optics at surfaces : Surface plasmons
(320.7130) Ultrafast optics : Ultrafast processes in condensed matter, including semiconductors
(180.4243) Microscopy : Near-field microscopy

ToC Category:
Ultrafast Optics

Original Manuscript: May 5, 2010
Revised Manuscript: June 8, 2010
Manuscript Accepted: June 8, 2010
Published: June 17, 2010

Zhi Li, Song Yue, Jianjun Chen, and Qihuang Gong, "Ultrafast spatiotemporal relaxation dynamics of excited electrons in a metal nanostructure detected by femtosecond-SNOM," Opt. Express 18, 14232-14237 (2010)

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