Scientific Results

Plasmonic Gold Nanocones in the Near-Infrared for Quantum Nano-Optics

Year: 2017

Authors: Flatae A.M., Tantussi F., Messina G.C., Mohammadi A., De Angelis F., Agio M.

Autors Affiliation: Plasmon Nanotechnologies, Istituto Italiano di Tecnologia, Genova, 16163, Italy; Laboratory of Nano-Optics, University of Siegen, Siegen, 57072, Germany; Department of Physics, Persian Gulf University, Bushehr, 75196, Iran; National Institute of Optics (INO), National Research Council (CNR), Florence, 50125, Italy

Abstract: Plasmonic gold nanocones offer outstanding possibilities to control light-matter interaction at the nanoscale. For instance, they can be exploited to modify the photonic environment around a single emitter for tuning its quantum efficiency and radiative decay rate, as well as the angular distribution and polarization of the emitted photons. However, fabricating high quality nanostructures with the desired aspect ratio and tip radius of curvature is still challenging. Here, this study reports on the fabrication of high-quality plasmonic gold nanocones based on electron beam-induced deposition of an organometallic precursor on a substrate to define the structures, followed by sputtering deposition of a gold layer. The technique is versatile and has a very good spatial resolution for the fabrication of nanocones with dimensions in the 100 nm range and a small aspect ratio, while exhibiting a very sharp tip radius of curvature down to 6 nm. The nanocones are engineered to have resonances in the near-infrared region, where absorption in gold is smaller. Using single-nanoparticle spectroscopic techniques, this study characterizes their optical properties and measures the plasmon resonances, finding linewidths down to 50 nm.

Journal/Review: ADVANCED OPTICAL MATERIALS

Volume: 5 (22)      Pages from: 1700586-1  to: 1700586-8

More Information: The authors gratefully acknowledge financial support by the University of Siegen, Germany, and the Italian Institute of Technology (IIT), Italy, and the COST Action MP1403 “Nanoscale Quantum Optics” for stimulating discussions. The research leading to these results has also received funding from the European Research Council under the European Union’s Seventh Framework Programme (FP/2007-2013)/ERC Grant Agreement n. [616213], CoG: Neuro-Plasmonics.
KeyWords: Angular distribution; Aspect ratio; Deposition; Electron beams; Gold; Infrared devices; Light; Nanotechnology; Optical properties; Organometallics; Plasmons; Substrates; Surface plasmon resonance, Dark-field spectroscopy; Electron beam-induced deposition; Light-matter interactions; Localized surface plasmon; Nano-cones; Organometallic precursors; Radiative decay rates; Spectroscopic technique; Nanostructures
DOI: 10.1002/adom.201700586

English