article published Viktor Myroshnychenko author 46371 Natsuki Nishio author F. Javier García de Abajo author Jens Förstner author 1580000-0001-7059-9862 Naoki Yamamoto author 61 department 230 department TRR 142 project TRR 142 - Project Area C project TRR 142 - Subproject C5 project Metal nanoparticles host localized plasmon excitations that allow the manipulation of optical fields at the nanoscale. Despite the availability of several techniques for imaging plasmons, direct access into the symmetries of these excitations remains elusive, thus hindering progress in the development of applications. Here, we present a combination of angle-, polarization-, and space-resolved cathodoluminescence spectroscopy methods to selectively access the symmetry and degeneracy of plasmonic states in lithographically fabricated gold nanoprisms. We experimentally reveal and spatially map degenerate states of multipole plasmon modes with nanometer spatial resolution and further provide recipes for resolving optically dark and out-of-plane modes. Full-wave simulations in conjunction with a simple tight-binding model explain the complex plasmon structure in these particles and reveal intriguing mode-symmetry phenomena. Our approach introduces systematics for a comprehensive symmetry characterization of plasmonic states in high-symmetry nanostructures. https://ris.uni-paderborn.de/download/4165/4166/2018 Myroshnychenko,Nishio,Garcia de Abajo,Förstner,Yamamoto_Unveiling and Imaging Degenerate States in Plasmonic Nanoparticles with Nanometer Resolution.pdf application/pdfno American Chemical Society (ACS)2018 eng tet_topic_plasmonics 1936-0851 1936-086X4165910.1021/acsnano.8b03926 1288436-8446 Myroshnychenko, Viktor, Natsuki Nishio, F. Javier García de Abajo, Jens Förstner, and Naoki Yamamoto. “Unveiling and Imaging Degenerate States in Plasmonic Nanoparticles with Nanometer Resolution.” <i>ACS Nano</i> 12, no. 8 (2018): 8436–46. <a href="https://doi.org/10.1021/acsnano.8b03926">https://doi.org/10.1021/acsnano.8b03926</a>. V. Myroshnychenko, N. Nishio, F. J. García de Abajo, J. Förstner, and N. Yamamoto, “Unveiling and Imaging Degenerate States in Plasmonic Nanoparticles with Nanometer Resolution,” <i>ACS Nano</i>, vol. 12, no. 8, pp. 8436–8446, 2018. Myroshnychenko V, Nishio N, García de Abajo FJ, Förstner J, Yamamoto N. Unveiling and Imaging Degenerate States in Plasmonic Nanoparticles with Nanometer Resolution. <i>ACS Nano</i>. 2018;12(8):8436-8446. doi:<a href="https://doi.org/10.1021/acsnano.8b03926">10.1021/acsnano.8b03926</a> Myroshnychenko, V., Nishio, N., García de Abajo, F. J., Förstner, J., &#38; Yamamoto, N. (2018). Unveiling and Imaging Degenerate States in Plasmonic Nanoparticles with Nanometer Resolution. <i>ACS Nano</i>, <i>12</i>(8), 8436–8446. <a href="https://doi.org/10.1021/acsnano.8b03926">https://doi.org/10.1021/acsnano.8b03926</a> V. Myroshnychenko, N. Nishio, F.J. García de Abajo, J. Förstner, N. Yamamoto, ACS Nano 12 (2018) 8436–8446. Myroshnychenko, Viktor, et al. “Unveiling and Imaging Degenerate States in Plasmonic Nanoparticles with Nanometer Resolution.” <i>ACS Nano</i>, vol. 12, no. 8, American Chemical Society (ACS), 2018, pp. 8436–46, doi:<a href="https://doi.org/10.1021/acsnano.8b03926">10.1021/acsnano.8b03926</a>. @article{Myroshnychenko_Nishio_García de Abajo_Förstner_Yamamoto_2018, title={Unveiling and Imaging Degenerate States in Plasmonic Nanoparticles with Nanometer Resolution}, volume={12}, DOI={<a href="https://doi.org/10.1021/acsnano.8b03926">10.1021/acsnano.8b03926</a>}, number={8}, journal={ACS Nano}, publisher={American Chemical Society (ACS)}, author={Myroshnychenko, Viktor and Nishio, Natsuki and García de Abajo, F. Javier and Förstner, Jens and Yamamoto, Naoki}, year={2018}, pages={8436–8446} } 41652018-08-28T07:44:24Z2022-01-06T07:00:27Z