Dresden 2017 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 59: Plasmonics and Nanooptics
O 59.7: Poster
Dienstag, 21. März 2017, 18:30–20:30, P2-OG1
Enhancement of the second harmonic signal of nonlinear crystals by nanoantennas — •Emre Gürdal1, Markus Kalmutzki2, Anke Horneber3, Hans-Jürgen Meyer2, Alfred J. Meixner3, Dai Zhang3, Dieter Kern1, and Monika Fleischer1 — 1Applied Physics, Tübingen, Germany — 2Inorganic Chemistry, Tübingen, Germany — 3Physical and Theoretical Chemistry, Tübingen, Germany
In the last decade nonlinear crystals have become a common tool for frequency conversion. A commonly observed second order nonlinear optical process is the so-called second harmonic generation (SHG). The interaction of two photons with e.g. a nonlinear crystal allows the creation of one photon with twice the energy. The efficiency of this nonlinear process can be enhanced using localized surface plasmons (LSPs). At the resonant wavelength of LSPs excited within metallic nanostructures, a strong electric near-field is created in their close vicinity, which improves the nonlinear optical process. We investigate nonlinear crystals that are nanostructured with gold nanodiscs by electron beam lithography. We measure and simulate the optical properties of dimers. The scattered intensities and resonance frequencies depend on the size and distance of the respective discs. For excitation we use a pulsed femtosecond laser with a wavelength of 774 nm, to which the nanodimer resonances are matched. The spectrally resolved nonlinear intensity at the position of the nanostructures is compared with the nonlinear signal of the unstructured crystal surface.