Regensburg 2010 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 59: Poster Session II (Nanostructures at surfaces: Dots, particles, clusters; Nanostructures at surfaces: arrays; Nanostructures at surfaces: Wires, tubes; Nanostructures at surfaces: Other; Plasmonics and nanooptics; Metal substrates: Epitaxy and growth; Metal substrates: Solid-liquid interfaces; Metal substrates: Adsoprtion of organic / bio molecules; Metal substrates: Adsoprtion of inorganic molecules; Metal substrates: Adsoprtion of O and/or H; Metal substrates: Clean surfaces; Density functional theory and beyond for real materials)
O 59.26: Poster
Mittwoch, 24. März 2010, 17:45–20:30, Poster B1
Near field and far field excitation of plasmonic waveguide arrays — •Arian Kriesch1,2,3, Jing Wen1,2, and Ulf Peschel2,3,4 — 1MPI für die Physik des Lichts, Erlangen, Germany — 2Friedrich-Alexander-Universtität Erlangen-Nürnberg, Erlangen, Germany — 3Erlangen Graduate School in Advanced Optical Technologies (SAOT) — 4Cluster of Excellence Engineering of Advanced Materials (EAM)
Recently it was demonstrated that highly birefringent materials can show negative refraction and self-imaging with sub-wavelength resolution. An array of metallic stripes with sub-wavelength periodicity can serve as such kind of metamaterial. It provides a negative permittivity for electric fields pointing along the stripes and a positive polarisability perpendicular to the lines. It also forms a system of coupled plasmonic waveguides thus transferring the concept of optical discreteness to the nano-world. Here we report results on the pointwise excitation of nanoscale plasmonic waveguide arrays with nanoantennas. We fabricated respective structures, using nanostructuring techniques. We found much stronger coupling between the waveguides than it is achievable and reported for arrays made from dielectrics, thus allowing for a much faster energy transport. Using a scanning near field optical microscope (SNOM) and highly focused beams propagating, waves were excited in the arrays. The experimental examination of coupling between neighbouring waveguides promises new insights into the processes of discrete diffraction and negative refraction on previously unmatched small spatial scales. A further goal is to achieve the formation of discrete spatial solitons in such a nanoarray.