2012/11/17 by Kristof Lodewijks, Jef Ryken, Lodewijks, Kristof +9
Engineering · Materials Science · #FOS: Physical sciences #Gold and Silver Nanoparticles Synthesis and Applications #Optical Coatings and Gratings #Optics (physics.optics) #Photonic and Optical Devices #Plasmonic and Surface Plasmon Research
paper · pdf · doi:10.48550/arxiv.1211.4120
openalex publication_date 2012/11/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Localized and propagating surface plasmon resonances are known to show very\npronounced interactions if they are simultaneously excited in the same\nnanostructure. Here we study the fano interference that occurs between\nlocalized (LSPR) and propagating (SPP) modes by means of phase sensitive\nspectroscopic ellipsometry. The sample structures consist of periodic gratings\nof gold nanodisks on top of a continuous gold layer and a thin dielectric\nspacer, in which the structural dimensions were tuned in such a way that the\ndipolar LSPR mode and the propagating SPP modes are excited in the same\nspectral region. We observe pronounced anti-crossing and strongly asymmetric\nline shapes when both modes move to each others vicinity, accompagnied of\nlargely increased phase differences between the respective plasmon resonances.\nMoreover we show that the anti-crossing can be exploited to increase the\nrefractive index sensitivity of the localized modes dramatically, which result\nin largely increased values for the Figure-Of-Merit which reaches values\nbetween 24 and 58 for the respective plasmon modes.\n