Probing surface plasmons on individual nano-objects by near-field electron energy loss spectroscopy

Mathieu Kociak; Odile Stephan; Dario Taverna; Jaysen Nelayah; Christian Colliex

doi:10.1117/12.614541

26 August 2005 Probing surface plasmons on individual nano-objects by near-field electron energy loss spectroscopy

Mathieu Kociak, Odile Stephan, Dario Taverna, Jaysen Nelayah, Christian Colliex

Proceedings Volume 5927, Plasmonics: Metallic Nanostructures and Their Optical Properties III; 592711 (2005) https://doi.org/10.1117/12.614541
Event: Optics and Photonics 2005, 2005, San Diego, California, United States

Abstract

Electron Energy Loss Spectroscopy in a Transmission Electron Microscope can probe with a high degree of spatial resolution the electronic excitation spectra of nanomaterial over an extended optical spectral range, typically from 2 to 50 eV. Here we describe a derived technique, called Near Field EELS, in which a subnanometer probe of high-energy electrons is positioned at controlled distances from the surface of an individual nano-object. It can then probe the locally induced electromagnetic field at the nanometer scale, which depends on the detailed nature, shape and dielectric response of the investigated nanostructure. This will be demonstrated on different kinds of nanotubes, the atomic structure of which being simultaneously determined by imaging. The obtained spectra can be well modeled within the framework of the so-called continuum dielectric theory. The importance of the coupling between inner and outer surfaces of the nanotubes will be pointed out. Most recent data concern the measurements of the optical gap for Boron Nitride nanotubes of different structural characteristics. Preliminary results on exploration of the electromagnetic fields on individual silver particles with different sizes and shapes, bringing therefore a complementary contribution to plasmonic studies at an unprecedented level of spatial resolution, is presented.

Citation Download Citation

Mathieu Kociak, Odile Stephan, Dario Taverna, Jaysen Nelayah, and Christian Colliex "Probing surface plasmons on individual nano-objects by near-field electron energy loss spectroscopy", Proc. SPIE 5927, Plasmonics: Metallic Nanostructures and Their Optical Properties III, 592711 (26 August 2005); https://doi.org/10.1117/12.614541

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