Shape matters: plasmonic nanoparticle shape enhances interaction with dielectric substrate |
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Authors: | Albella Pablo Garcia-Cueto Borja González Francisco Moreno Fernando Wu Pae C Kim Tong-Ho Brown April Yang Yang Everitt Henry O Videen Gorden |
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Affiliation: | Grupo de O?ptica, Departamento Fi?sica Aplicada, Universidad de Cantabria, 39005 Santander, Spain. |
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Abstract: | Numerical analyses of the ultraviolet and visible plasmonic spectra measured from hemispherical gallium nanostructures on dielectric substrates reveal that resonance frequencies are quite sensitive to illumination angle and polarization in a way that depends on nanostructure size, shape, and substrate. Large, polarization-dependent splittings arise from the broken symmetry of hemispherical gallium nanoparticles on sapphire substrates, inducing strong interactions with the substrate that depend sensitively on the angle of illumination and the nanoparticle diameter. |
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