Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 28: Plasmonics and Nanooptics IV: Light-Matter Interaction
O 28.10: Vortrag
Dienstag, 21. März 2017, 12:45–13:00, TRE Ma
(The Road to) Understanding Localization of Light in Nanosponges — •Felix Schwarz1, Jan Vogelsang3, Germann Hergert3, Dong Wang2, Heiko Kollmann3, Petra Groß3, Erich Runge1, Christoph Lienau3, and Peter Schaaf2 — 1TU Ilmenau, Institut für Physik und IMN MacroNano, 98693 Ilmenau — 2TU Ilmenau, Institut für Werkstofftechnik und IMN MacroNano, 98693 Ilmenau — 3Carl von Ossietzky Universität, Institut für Physik and Center of Interface Science, 26129 Oldenburg
Disorder on the nanometer scale can lead to localization of light and huge electromagnetic field enhancement, which in turn can be used for non-linear optics and for the study and exploitation of quantum optical processes. Most recently, long-lived, highly localized plasmons on the surface of nanoporous gold-nanoparticles (nanosponges) with an unmatched excitation efficiency were reported based on photoemission. Surprisingly, first calculations show that on these sponges localization takes place on the same length scale as the typical pore size. To optimally tailor the disorder for potential applications and increase the understanding of this unusual localization process, we systematically examine the influence of the specific type of disorder. Far-field scattering and near-field properties are calculated for different correlation functions and filling fraction of the sponges. Furthermore, a multiscale approach is presented, where parts of the surface can be simulated with increased resolution while the antenna resonances are evaluated in an effective-medium picture. Very good agreement with experimental data regarding the field enhancement and lifetime is reported.