Berlin 2015 – wissenschaftliches Programm
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DS: Fachverband Dünne Schichten
DS 14: Plasmonics and nanooptics: Structure, fabrication and characterization (joint session with O)
DS 14.4: Vortrag
Dienstag, 17. März 2015, 11:15–11:30, MA 043
Fabrication and Characterization of Plasmonic Nanocone Antennas for Strong Spontaneous Emission Enhancement — •Björn Hoffmann1, Simon Vassant1, Xue-Wen Chen1, Stephan Götzinger1,2, Vahid Sandoghdar1,2, and Silke Christiansen1,3 — 1Max Planck Institute for the Science of Light, Erlangen, Germany — 2Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany — 3Helmholtz Centre Berlin for Materials and Energy, Berlin, Germany
Plasmonic nano-antennas have attracted remarkable attention due to their ability to strongly modify the excitation and emission channels of quantum emitters. Metallic nanocones are a promising candidate for a strong enhancement of spontaneous emission while keeping high quantum efficiencies. Here, we report on the precise fabrication of gold nanocones with tunable dimensions to tailor their plasmon resonance to specific applications. Therefore, we developed a focused ion beam (FIB) etching procedure that offers precise control over the height, diameter and tip radius of the cones. We measured the plasmon resonance spectra of gradually etched cones and were able to reproduce the spectra by BOR-FDTD simulations. The cones show reproducible plasmon resonances between 580 - 700 nm and exhibit theoretical radiative Purcell factors above 500, which renders them promising structures for spontaneous emission enhancement.