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ACS Nano. 2012 Feb 28;6(2):1299-307. doi: 10.1021/nn2040389. Epub 2012 Feb 1.

Spatial confinement of electromagnetic hot and cold spots in gold nanocubes.

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  • 1Laboratoire de Nanotechnologie et d'Instrumentation Optique LNIO-CNRS UMR 6279, UniversitĂ© de Technologie de Troyes, Troyes, France.


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 λ/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.

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