Near-field optical properties of Au-Nanocubes: confinement of hot and cold spots

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

doi:10.1117/12.922414

30 April 2012 Near-field optical properties of Au-Nanocubes: confinement of hot and cold spots

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

Proceedings Volume 8424, Nanophotonics IV; 842415 (2012) https://doi.org/10.1117/12.922414
Event: SPIE Photonics Europe, 2012, Brussels, Belgium

Abstract

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.

Citation Download Citation

M. Haggui, M. Dridi, J. Plain, S. Marguet, H. Perez, G. C. Schatz, G. P. Wiederrecht, S. K. Gray, and R. Bachelot "Near-field optical properties of Au-Nanocubes: confinement of hot and cold spots", Proc. SPIE 8424, Nanophotonics IV, 842415 (30 April 2012); https://doi.org/10.1117/12.922414

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