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By controling the 2D growth of Au colloids and by studying teir non-linear optical properties, E. Dujardin, A. Arbouet, C. Girard et al. Demonstrate that plasmonic modes can be directly probed by optical microscopy. These results, published in Nature Materials, open the way to a new optical information paradigm based on the engineering of plasmonic modes. DOI: 10.1038/NMAT3581