Tailored nanoscale plasmon-enhanced vibrational electron spectroscopy

Atomic vibrations and phonons are an excellent source of information on nanomaterials that we can access through a variety of methods including Raman scattering, infrared spectroscopy, and electron energy-loss spectroscopy (EELS). In the presence of a plasmon local field, vibrations are strongly mod...

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Detalles Bibliográficos
Autores: Tizei, Luiz H. G., Mkhitaryan, Vahagn, Lourenço-Martins, Hugo, Scarabelli, Leonardo|||0000-0002-6830-5893, Watanabe, Kenji, Taniguchi, Takashi, Tencé, Marcel, Blazit, Jean-Denis, Li, Xiaoyan, Gloter, Alexandre, Zobelli, Alberto, Schmidt, Franz-Philipp, Liz Marzán, Luis Manuel, García de Abajo, F. Javier, Stéphan, Odile, Kociak, Mathieu
Tipo de recurso: artículo
Fecha de publicación:2020
País:España
Institución:Universidad de Cantabria (UC)
Repositorio:UCrea Repositorio Abierto de la Universidad de Cantabria
Idioma:inglés
OAI Identifier:oai:repositorio.unican.es:10902/33610
Acceso en línea:https://hdl.handle.net/10902/33610
Access Level:acceso abierto
Palabra clave:Electron energy-loss spectroscopy (EELS)
Plasmon−phonon coupling
Raman scattering
Plasmon-enhanced vibrational spectroscopy (PEVES)
Fuchs-Kliewer modes
Strong coupling
h-BN
Descripción
Sumario:Atomic vibrations and phonons are an excellent source of information on nanomaterials that we can access through a variety of methods including Raman scattering, infrared spectroscopy, and electron energy-loss spectroscopy (EELS). In the presence of a plasmon local field, vibrations are strongly modified and, in particular, their dipolar strengths are highly enhanced, thus rendering Raman scattering and infrared spectroscopy extremely sensitive techniques. Here, we experimentally demonstrate that the interaction between a relativistic electron and vibrational modes in nanostructures is fundamentally modified in the presence of plasmons. We finely tune the energy of surface plasmons in metallic nanowires in the vicinity of hexagonal boron nitride, making it possible to monitor and disentangle both strong phonon-plasmon coupling and plasmon-driven phonon enhancement at the nanometer scale. Because of the near-field character of the electron beam-phonon interaction, optically inactive phonon modes are also observed. Besides increasing our understanding of phonon physics, our results hold great potential for investigating sensing mechanisms and chemistry in complex nanomaterials down to the molecular level.

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