SKM 2023 – scientific programme

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O: Fachverband Oberflächenphysik

O 91: Plasmonics and Nanooptics V: Waveguides and Antennas

O 91.4: Talk

Friday, March 31, 2023, 11:15–11:30, CHE 89

Spatially resolved nonlinear plasmonics — •Johannes Schust, Florian Mangold, Niklas Metz, Mario Hentschel, Bettina Frank, and Harald Giessen — 4th Physics Institute, Research Center SCoPE, and IQST, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany

Nonlinear optical plasmonics investigates plasmonic nanoantenna fields with the help of nonlinear spectroscopy. Here we introduce nonlinear spatially resolved spectroscopy (NSRS) which is capable of imaging the k-space as well as spatially resolved single antennas while it is still possible to carry out spectroscopy.

These additional abilities give us the possibility to spatially resolve the THG signal of gold nanoantenna arrays and investigate the homogeneity of the antenna field. Furthermore, we are able to spatially resolve the THG emission centers of the third-order mode and observe their response to tuning the wavelength over the resonance.

In addition, we discovered that by increasing the laser intensity, certain antennas in our array became exceptionally bright. By correlating our spatially resolved nonlinear image with structural SEM data, we can prove that these bright antennas have deformed into a peanut shape. Thus our NSRS setup enables the investigation of the nonlinear self-enhancement process of nanoantennas under intense laser heating.