naa a22 4500 510817033 CHVBK 20180411083512.0 cr unu---uuuuu 180411e20130601xx s 000 0 eng 10.1007/s11468-012-9403-z doi (NATIONALLICENCE)springer-10.1007/s11468-012-9403-z Sandu Titus National Institute for Research and Development in Microtechnologies, 126A Erou Iancu Nicolae Street, 077190, Bucharest, Romania aut Eigenmode Decomposition of the Near-Field Enhancement in Localized Surface Plasmon Resonances of Metallic Nanoparticles [Elektronische Daten] [Titus Sandu] I present a direct and intuitive eigenmode method that evaluates the near-field enhancement around the surface of metallic nanoparticles of arbitrary shape. The method is based on the boundary integral equation (BIE) in the electrostatic limit. Besides the nanoparticle polarizability and the far-field response, the near-field enhancement around nanoparticles can be also conveniently expressed as an eigenmode sum of resonant terms. Moreover, the spatial configuration of the near-field enhancement depends explicitly on the eigenfunctions of both the BIE integral operator and of its adjoint. It has also established a direct physical meaning of the two types of eigenfunctions. While it is well known that the eigenfunctions of the BIE operator are electric charge modes, it is less known and used that the eigenfunctions of the adjoint represent the electric potential generated by the charge modes. For the enhanced spectroscopies, the present method allows an easy identification of hot spots which are located in the regions with maximum charge densities and/or regions with fast variations of the electric potential generated by the charge modes on the surface. This study also clarifies the similarities and the differences between the far-field and the near-field behavior of plasmonic systems. Finally, the analysis of concrete examples like the nearly touching dimer, the prolate spheroid, and the nanorod illustrate some modalities to improve the near-field enhancement. Springer Science+Business Media, LLC, 2012 Localized surface plasmon resonance nationallicence Boundary integral equation nationallicence Surface enhanced Raman spectroscopy nationallicence Plasmonics Springer US; http://www.springer-ny.com 8/2(2013-06-01), 391-402 1557-1955 8:2<391 2013 8 11468 https://doi.org/10.1007/s11468-012-9403-z text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11468-012-9403-z text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Sandu Titus National Institute for Research and Development in Microtechnologies, 126A Erou Iancu Nicolae Street, 077190, Bucharest, Romania aut NATIONALLICENCE 773 0- Plasmonics Springer US; http://www.springer-ny.com 8/2(2013-06-01), 391-402 1557-1955 8:2<391 2013 8 11468 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer