Near-field optical properties of Au-nanocubes: Confinement of hot and cold spots

M. Haggui*, M. Dridi, J. Plain, S. Marguet, H. Perez, George C Schatz, G. P. Wiederrecht, S. K. Gray, R. Bachelot

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution


We studied the near-field optical properties of colloidal gold nanocubes (GNCs) using a photochemical imaging method. This method is based on the vectorial molecular displacements, of photosensitive azo-dyes, which are sensitive to the polarization of the optical near-field of the GNCs. We analyzed the spatial confinement of both electromagnetic hot and "cold" spots with a spatial resolution up to 15nm (λ/35). The new concept of cold spot presents valuable and complementary electromagnetic information to the well known electromagnetic hot spot. We demonstrated that cold spots are highly sensitive to polarization and can be much more confined than hot spots enabling them to be applied in high resolution imaging and spectroscopy.

Original languageEnglish (US)
Title of host publicationNanophotonics IV
StatePublished - Jul 11 2012
EventNanophotonics IV - Brussels, Belgium
Duration: Apr 15 2012Apr 19 2012


OtherNanophotonics IV


  • Near-field imaging
  • Plasmonics
  • cold spots
  • hot spots
  • photoisomerization

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering


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