Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 52: Photonics and Nanooptics II: Nonlinear Response
O 52.8: Vortrag
Mittwoch, 9. März 2016, 12:15–12:30, S051
Shaping the Nonlinear Near-Field of Single Gold Nanostructures — •Daniela Wolf1,2, Julian Obermeier1, Thorsten Schumacher1, and Markus Lippitz1 — 1Experimental Physics III, University of Bayreuth, Universitaetsstr. 30, 95447 Bayreuth, Germany — 2Max Planck Institute for Solid State Research, Heisenbergstr. 1, 70569 Stuttgart, Germany
Light scattering at plasmonic nanoparticles and their assemblies has led to a wealth of applications in metamaterials and nanooptics. While the shaping of fields around nanostructures is widely studied, the influence of the field inside the nanostructures is often overlooked. The linear field distribution inside the structure taken to the third power causes third-harmonic generation, a nonlinear optical response of matter. Here we demonstrate by a far-field Fourier imaging method how this simple fact can be used to shape fields around already a single particle alone. We employ this scheme to switch the third-harmonic emission from a single point source to two spatially separated but coherent sources, as in Young's double slit assembly. Finally, we present some recent results on more advanced structures combining nonlinear plasmonics and waveguiding.