naa a22 4500 510816045 CHVBK 20180411083508.0 cr unu---uuuuu 180411e20130901xx s 000 0 eng 10.1007/s11468-013-9555-5 doi (NATIONALLICENCE)springer-10.1007/s11468-013-9555-5 Optical Properties of Silver-Coated Silicon Nanowires: Morphological and Plasmonic Excitations [Elektronische Daten] [R. Ekeroth, M. Lester] The optical extinction spectra of micro- and nanoparticles made up of high-contrast dielectrics exhibit a set of very intense peaks due to the excitations of morphology-dependent resonances (MDRs). These kind of resonances are well known at the microscopic scale as whispering gallery modes. In this work, we study numerically the optical spectra corresponding to a core-shell structure composed by an infinite silicon nanowire coated with a silver shell. This structure shows a combination of both excitations: MDRs and the well-known surface plasmon resonances in dielectric metallic core-shell nanoparticles (Ekeroth Abraham and Lester, Plasmon 2012). We compute in an exact form the complete electromagnetic response for both bare and coated silicon nanowires in the range of 24-200 nm of cross-sectional sizes. We take into account an experimental bulk dielectric function of crystalline silicon and silver by using a correction by size of the metal dielectric function. In this paper, we consider small silver shells in the range of 1-10 nm of thickness as coatings. We analyze the optical response in both the far and near fields, involving wavelengths in the extended range of 300-2,400 nm. We show that the MDRs excited at the core are selectively perturbated by the metallic shell through the bonding and antibonding surface plasmons (SPs). This perturbation depends on both the size of the core and the thickness of the shell, and, as a consequence, we get an efficient tuneable and detectable simple system. Our calculations apply perfectly to long nanotubes compared to the wavelength for the two fundamental polarizations (s, p). Springer Science+Business Media New York, 2013 Core-shell nanowires nationallicence Plasmonics nationallicence Morphology-dependent resonances nationallicence Ekeroth R. Grupo de Óptica de Sólidos-Elfo, Centro de Investigaciones en Física e Ingeniería del Centro de la Provincia de Buenos Aires, Instituto de Física Arroyo Seco, Facultad de Ciencias Exactas, Universidad Nacional del Centro de la Provincia de Buenos Aires. Consejo Nacional de Investigaciones Cientficas y Técnicas (CONICET), Pinto 399, CP 7000, Tandil, Buenos Aires, Argentina aut Lester M. Grupo de Óptica de Sólidos-Elfo, Centro de Investigaciones en Física e Ingeniería del Centro de la Provincia de Buenos Aires, Instituto de Física Arroyo Seco, Facultad de Ciencias Exactas, Universidad Nacional del Centro de la Provincia de Buenos Aires. Consejo Nacional de Investigaciones Cientficas y Técnicas (CONICET), Pinto 399, CP 7000, Tandil, Buenos Aires, Argentina aut Plasmonics Springer US; http://www.springer-ny.com 8/3(2013-09-01), 1417-1428 1557-1955 8:3<1417 2013 8 11468 https://doi.org/10.1007/s11468-013-9555-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11468-013-9555-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ekeroth R. Grupo de Óptica de Sólidos-Elfo, Centro de Investigaciones en Física e Ingeniería del Centro de la Provincia de Buenos Aires, Instituto de Física Arroyo Seco, Facultad de Ciencias Exactas, Universidad Nacional del Centro de la Provincia de Buenos Aires. Consejo Nacional de Investigaciones Cientficas y Técnicas (CONICET), Pinto 399, CP 7000, Tandil, Buenos Aires, Argentina aut NATIONALLICENCE 700 1- Lester M. Grupo de Óptica de Sólidos-Elfo, Centro de Investigaciones en Física e Ingeniería del Centro de la Provincia de Buenos Aires, Instituto de Física Arroyo Seco, Facultad de Ciencias Exactas, Universidad Nacional del Centro de la Provincia de Buenos Aires. Consejo Nacional de Investigaciones Cientficas y Técnicas (CONICET), Pinto 399, CP 7000, Tandil, Buenos Aires, Argentina aut NATIONALLICENCE 773 0- Plasmonics Springer US; http://www.springer-ny.com 8/3(2013-09-01), 1417-1428 1557-1955 8:3<1417 2013 8 11468 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer