Spatial confinement of electromagnetic hot and cold spots in gold nanocubes

Mohamed Haggui, Montacer Dridi, Jérôme Plain, Sylvie Marguet, Henri Perez, George C. Schatz, Gary P. Wiederrecht, Stephen K. Gray, Renaud Bachelot*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

77 Scopus citations


We report a near-field imaging study of colloidal gold nanocubes. This is accomplished through a photochemical imaging method in which molecular displacements are vectorial in nature, enabling sensitivity to the polarization of the optical near-field of the nanocubes. We analyze the confinement of both electromagnetic hot and "cold" spots with a resolution of Î/35 and emphasize the particularly high spatial confinement of cold spots. The concept of a cold spot complements the well-known electromagnetic hot spot but can have significant advantages. The application of the ultraconfined cold spots to high resolution imaging and spectroscopy is discussed.

Original languageEnglish (US)
Pages (from-to)1299-1307
Number of pages9
JournalACS nano
Issue number2
StatePublished - Feb 28 2012


  • azobenzene
  • electromagnetic cold spots
  • electromagnetic hot spot
  • gold
  • nanocubes
  • near-field depolarization
  • near-field photochemical imaging
  • photoisomerization
  • plasmon

ASJC Scopus subject areas

  • General Engineering
  • General Materials Science
  • General Physics and Astronomy


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