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3D Imaging of Gap Plasmons in Vertically Coupled Nanoparticles by EELS Tomography
[Image: see text] Plasmonic gap modes provide the ultimate confinement of optical fields. Demanding high spatial resolution, the direct imaging of these modes was only recently achieved by electron energy loss spectroscopy (EELS) in a scanning transmission electron microscope (STEM). However, conven...
Autores principales: | , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Chemical Society
2017
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5683695/ https://www.ncbi.nlm.nih.gov/pubmed/28981295 http://dx.doi.org/10.1021/acs.nanolett.7b02979 |
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author | Haberfehlner, Georg Schmidt, Franz-Philipp Schaffernak, Gernot Hörl, Anton Trügler, Andreas Hohenau, Andreas Hofer, Ferdinand Krenn, Joachim R. Hohenester, Ulrich Kothleitner, Gerald |
author_facet | Haberfehlner, Georg Schmidt, Franz-Philipp Schaffernak, Gernot Hörl, Anton Trügler, Andreas Hohenau, Andreas Hofer, Ferdinand Krenn, Joachim R. Hohenester, Ulrich Kothleitner, Gerald |
author_sort | Haberfehlner, Georg |
collection | PubMed |
description | [Image: see text] Plasmonic gap modes provide the ultimate confinement of optical fields. Demanding high spatial resolution, the direct imaging of these modes was only recently achieved by electron energy loss spectroscopy (EELS) in a scanning transmission electron microscope (STEM). However, conventional 2D STEM-EELS is only sensitive to components of the photonic local density of states (LDOS) parallel to the electron trajectory. It is thus insensitive to specific gap modes, a restriction that was lifted with the introduction of tomographic 3D EELS imaging. Here, we show that by 3D EELS tomography the gap mode LDOS of a vertically stacked nanotriangle dimer can be fully imaged. Besides probing the complete mode spectrum, we demonstrate that the tomographic approach allows disentangling the signal contributions from the two nanotriangles that superimpose in a single measurement with a fixed electron trajectory. Generally, vertically coupled nanoparticles enable the tailoring of 3D plasmonic fields, and their full characterization will thus aid the development of complex nanophotonic devices. |
format | Online Article Text |
id | pubmed-5683695 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | American Chemical Society |
record_format | MEDLINE/PubMed |
spelling | pubmed-56836952017-11-15 3D Imaging of Gap Plasmons in Vertically Coupled Nanoparticles by EELS Tomography Haberfehlner, Georg Schmidt, Franz-Philipp Schaffernak, Gernot Hörl, Anton Trügler, Andreas Hohenau, Andreas Hofer, Ferdinand Krenn, Joachim R. Hohenester, Ulrich Kothleitner, Gerald Nano Lett [Image: see text] Plasmonic gap modes provide the ultimate confinement of optical fields. Demanding high spatial resolution, the direct imaging of these modes was only recently achieved by electron energy loss spectroscopy (EELS) in a scanning transmission electron microscope (STEM). However, conventional 2D STEM-EELS is only sensitive to components of the photonic local density of states (LDOS) parallel to the electron trajectory. It is thus insensitive to specific gap modes, a restriction that was lifted with the introduction of tomographic 3D EELS imaging. Here, we show that by 3D EELS tomography the gap mode LDOS of a vertically stacked nanotriangle dimer can be fully imaged. Besides probing the complete mode spectrum, we demonstrate that the tomographic approach allows disentangling the signal contributions from the two nanotriangles that superimpose in a single measurement with a fixed electron trajectory. Generally, vertically coupled nanoparticles enable the tailoring of 3D plasmonic fields, and their full characterization will thus aid the development of complex nanophotonic devices. American Chemical Society 2017-10-05 2017-11-08 /pmc/articles/PMC5683695/ /pubmed/28981295 http://dx.doi.org/10.1021/acs.nanolett.7b02979 Text en Copyright © 2017 American Chemical Society This is an open access article published under a Creative Commons Attribution (CC-BY) License (http://pubs.acs.org/page/policy/authorchoice_ccby_termsofuse.html) , which permits unrestricted use, distribution and reproduction in any medium, provided the author and source are cited. |
spellingShingle | Haberfehlner, Georg Schmidt, Franz-Philipp Schaffernak, Gernot Hörl, Anton Trügler, Andreas Hohenau, Andreas Hofer, Ferdinand Krenn, Joachim R. Hohenester, Ulrich Kothleitner, Gerald 3D Imaging of Gap Plasmons in Vertically Coupled Nanoparticles by EELS Tomography |
title | 3D Imaging of Gap Plasmons in Vertically Coupled Nanoparticles
by EELS Tomography |
title_full | 3D Imaging of Gap Plasmons in Vertically Coupled Nanoparticles
by EELS Tomography |
title_fullStr | 3D Imaging of Gap Plasmons in Vertically Coupled Nanoparticles
by EELS Tomography |
title_full_unstemmed | 3D Imaging of Gap Plasmons in Vertically Coupled Nanoparticles
by EELS Tomography |
title_short | 3D Imaging of Gap Plasmons in Vertically Coupled Nanoparticles
by EELS Tomography |
title_sort | 3d imaging of gap plasmons in vertically coupled nanoparticles
by eels tomography |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5683695/ https://www.ncbi.nlm.nih.gov/pubmed/28981295 http://dx.doi.org/10.1021/acs.nanolett.7b02979 |
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