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Multimodal plasmonics in fused colloidal networks

Nature Materials volume 14, pages 87–94 (2015)Cite this article

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Abstract

Harnessing the optical properties of noble metals down to the nanometre scale is a key step towards fast and low-dissipative information processing. At the 10-nm length scale, metal crystallinity and patterning as well as probing of surface plasmon properties must be controlled with a challenging high level of precision. Here, we demonstrate that ultimate lateral confinement and delocalization of surface plasmon modes are simultaneously achieved in extended self-assembled networks comprising linear chains of partially fused gold nanoparticles. The spectral and spatial distributions of the surface plasmon modes associated with the colloidal superstructures are evidenced by performing monochromated electron energy-loss spectroscopy with a nanometre-sized electron probe. We prepare the metallic bead strings by electron-beam-induced interparticle fusion of nanoparticle networks. The fused superstructures retain the native morphology and crystallinity but develop very low-energy surface plasmon modes that are capable of supporting long-range and spectrally tunable propagation in nanoscale waveguides.

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Figure 1: Spatial and spectral characterization of plasmon-mediated electron energy loss in the vicinity of a fused Au nanoparticle chain.
Figure 2: Numerical simulation of EELS spectra of plasmonic nanoparticle chains.
Figure 3: Extreme confinement of the 2.4 eV plasmon mode in complex PNNs.
Figure 4: Mapping of low-energy plasmon modes in complex PNNs.

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Acknowledgements

The authors thank A. Mlayah and A. Arbouet for continuous and fruitful discussions. This work was supported by the European Research Council (ERC; contract number ERC–2007-StG Nr 203872 COMOSYEL), and the massively parallel computing center CALMIP in Toulouse. A.T. thanks the LabEx project NEXT (Programme Investissements d’Avenir, contract ANR-10-LABX-0037-NEXT) for a travel grant to IMRE. The authors thank M. Nunez for technical assistance in TEM imaging.

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Authors and Affiliations

  1. CEMES CNRS UPR 8011, 29 rue J. Marvig, 31055 Toulouse Cedex 4, France

    Alexandre Teulle, Christian Girard, Kargal L. Gurunatha & Erik Dujardin

  2. Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 3 Research Link, 117602 Singapore, Singapore

    Michel Bosman

  3. Centre for Organized Matter Chemistry, School of Chemistry, University of Bristol, Cantocks Close, Bristol BS8 1TS, UK

    Mei Li & Stephen Mann

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  1. Alexandre Teulle
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Contributions

E.D., M.B., C.G. and S.M. conceived the experiments. K.L.G. and M.L. synthesized the nanoparticles and A.T. and M.L. prepared PNN suspension and TEM samples. M.B. performed and processed EELS experiments. C.G. and A.T. developed the model and implemented the simulation codes. A.T., M.B., C.G. and E.D. performed data and simulation analysis and prepared the figures. All co-authors contributed to the writing of the article.

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Correspondence to Michel Bosman or Erik Dujardin.

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Teulle, A., Bosman, M., Girard, C. et al. Multimodal plasmonics in fused colloidal networks. Nature Mater 14, 87–94 (2015). https://doi.org/10.1038/nmat4114

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