Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 37: Posters: Plasmonics, Electronic Structure and Spin-Orbit Interaction, Semiconductor and Insulator Surfaces, Nanostructures

O 37.17: Poster

Dienstag, 1. April 2014, 18:30–22:00, P2

Nonlinear optics with hybrid metal/dielectric nanostructures — •Heiko Linnenbank and Stefan Linden — Physikalisches Institut, Universität Bonn, Germany

Particle plasmons, i.e, coherent excitations of the conduction band electrons, govern the optical properties of metallic nanostructures in the visible and in the near-infrared spectral region. Excitation of particle plasmons with ultrashort light pulses can give rise to a spatiotemporal concentration of the electromagnetic field in the vicinity of the metallic nanostructure. The intensity in these hot spots can exceed the incident intensity by orders of magnitude. Conversely, localized fields within these hot spots can be efficiently transferred to the far field. By carefully varying the geometry of the metallic nanostructures it is possibly to tune their resonance and also to build structures with multiple resonances. In several studies it has been shown that gold nanostructures show a huge nonlinear response in terms of second and third harmonic generation to ultrashort light pulses. Here, we demonstrate that it is possible to influence the nonlinear emission of metallic nanoparticles by placing a dielectric material with a high second and third order nonlinear coefficient in the above mentioned hot spots. Furthermore, we show that the nonlinear processes can be tuned by building a metallic nanostructure which is not only resonant for the incoming light field but also for the generated field.