Regensburg 2019 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 27: Plasmonics II (joint session O/CPP)

CPP 27.4: Vortrag

Dienstag, 2. April 2019, 14:45–15:00, H8

Plasmonic analogue of Electromagnetically Induced Absorption Boosts Third Harmonic Generation — •Joachim Krauth, Mario Hentschel, Bernd Metzger, and Harald Giessen — 4th Physics Institute and Research Center SCoPE, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany

In three-dimensional nanostructures, the appropriate choice of geometry and materials allows for tailoring the linear optical properties in a vast range. In the so-called plasmonic dolmen structure the coupling between a bright and a dark state can be manipulated to realize the plasmonic analogue of electromagnetically induced absorption (EIA), resulting in an enhanced absorbance of the coupled system. In analogy to solid state nonlinear optics, in which the linear absorption spectra largely determine the nonlinear interaction, plasmonic EIA is therefore expected to boost nonlinear conversion efficiencies. We are reporting third harmonic generation spectroscopy results on a plasmonic EIA system. The radiated third harmonic signals can be understood when taking the intricate phase relation and coupling strength dependence of EIA into account. An appropriately modified anharmonic oscillator model based on the linear absorption spectra can describe the nonlinear response of our three-dimensional plasmonic structure. The design freedom associated with three-dimensional nanostructuring can provide further insight into the nonlinear response of complex plasmonic systems.