Regensburg 2016 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 52: Photonics and Nanooptics II: Nonlinear Response

O 52.6: Vortrag

Mittwoch, 9. März 2016, 11:45–12:00, S051

Third harmonic efficiency scaling with plasmonic antenna length — •Maxim Nesterov, Mario Hentschel, Bernd Metzger, Harald Giessen, and Thomas Weiss — 4th Physics Insitute and Research Centre SCoPE, University of Stuttgart, 70550 Stuttgart, Germany

Nonlinear interaction of light with plasmonic structures leads to higher-order harmonic generation, such as second-order harmonics in non-centrosymmetric media, and third-order harmonics in centrosymmetric systems. Metallic antennas are characterized by a high field concentration at resonances, resulting in a relatively strong nonlinear optical response. The enhancement of higher-order harmonic generation depends on the size and shape of antenna, and a strong nonlinear signal can be achieved with a proper design.

We study scaling of the third harmonic generation with rod antenna length numerically for a single antenna, as well as for array configurations. The third-harmonic intensity is found to be increasing as a twelfth power of an antenna length in the model based on Miller's rule. We discuss applicability of the Miller's rule in the context of the origin of the nonlinear susceptibility in the metals. An analytical model has been developed to support the numerical results.