Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 77: Poster: Plasmonics and Nanooptics
O 77.4: Poster
Mittwoch, 14. März 2018, 18:15–20:30, Poster A
Plasmonic cavities and resonators in crystalline particles: fabrication and optical properties — •Manuel Gonçalves1, Amos Kiyumbi1, Joseph Iduwe1, Frederike Erb1, Gregor Neusser2, Christine Kranz2, Othmar Marti1, and Kay Gottschalk1 — 1Ulm University - Institute of Experimental Physics, Ulm, Germany — 2Ulm University - Institute of Analytical and Bioanalytical Chemistry, Ulm, Germany
Crystalline particles of gold and silver offer the best quality for the fabrication of plasmonic cavities, milled by focused ion beam (FIB). Due to the smoothness of the metal surface and consequent low absorption and radiation losses, groove cavities and other resonators can strongly enhance the near-fields and reach large Purcell factors. We have investigated theoretically and experimentally the reflection spectra of arrays of cavities milled in gold and silver particles and the fluorescence of dye molecules localized near silver particles. Metasurfaces formed by arrays of cavities may work as a band selective absorbing filter, or as a polarizer. Moreover, we have found that the sharp edges of the silver particles strongly enhance the dye fluorescence.