2024-03-29T06:24:43Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/759502016-02-17T19:17:02Zcom_10261_93com_10261_4col_10261_346
Nelayah, J.
García de Abajo, Francisco Javier
Tencé, M.
Henrard, L.
Colliex, C.
2013-05-13T10:09:56Z
2013-05-13T10:09:56Z
2007
Nature Physics 3: 348-353 (2007)
http://hdl.handle.net/10261/75950
10.1038/nphys575
Understanding how light interacts with matter at the nanometre scale is a fundamental issue in optoelectronics and nanophotonics. In particular, many applications (such as bio-sensing, cancer therapy and all-optical signal processing) rely on surface-bound optical excitations in metallic nanoparticles. However, so far no experimental technique has been capable of imaging localized optical excitations with sufficient resolution to reveal their dramatic spatial variation over one single nanoparticle. Here, we present a novel method applied on silver nanotriangles, achieving such resolution by recording maps of plasmons in the near-infrared/visible/ultraviolet domain using electron beams instead of photons. This method relies on the detection of plasmons as resonance peaks in the energy-loss spectra of subnanometre electron beams rastered on nanoparticles of well-defined geometrical parameters. This represents a significant improvement in the spatial resolution with which plasmonic modes can be imaged, and provides a powerful tool in the development of nanometre-level optics. ©2007 Nature Publishing Group.
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Mapping surface plasmons on a single metallic nanoparticle
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