Berlin 2018 – scientific programme

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O: Fachverband Oberflächenphysik

O 66: Plasmonics and nanooptics: Applications and other aspects II

O 66.2: Talk

Wednesday, March 14, 2018, 15:15–15:30, MA 041

Numerical modeling of second harmonic generation in metal nanoantennas — •Josselin Defrance and Thomas Weiss — 4th Physics Institute and Research Centers SCoPE, University of Stuttgart, Germany

Metallic nanoantennas can concentrate light into sub-wavelength volumes resulting in strong nonlinear responses. In order to understand and enhance this nonlinear optical phenomena, numerical methods play a crucial role. Different approaches have been developed to model the nonlinear interaction between the electromagnetic field and matter. The so-called Fourier modal method offers a fast and accurate calculation of far-field responses. It has been shown that the Fourier modal method can be extended in order to calculate the generation of higher harmonics [1,2]. However, convergence problems arise for complex geometries and at metal-dielectric interfaces. Therefore, we have combined this method with adaptive spatial resolution and matched coordinates [3] for calculating the nonlinear optical response of nanostructures with complex geometries. Furthermore, we will present our implementation of the hydrodynamic model in order to account for nonlocal contributions to the second-harmonic generation in metallic nanoantennas [4].

[1] T. Paul et al., J. Opt. Soc. B, Vol. 27, Issue. 5, pp. 1118 (2010).

[2] B. Bai et al., J. Opt. Soc. Am. B 24, pp. 1105-1112 (2007).

[3] T. Weiss et al., Opt. Express 17, pp. 8051 (2009).

[4] T. Paul et al., J. Mod. Opt. 58, 5-6, pp. 438-448 (2011).