Dresden 2020 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 50: Poster Session - Plasmonics and Nanooptics: Fabrication and Characterization
O 50.3: Poster
Dienstag, 17. März 2020, 18:15–20:00, P2/EG
Generation of ultrashort laser pulses for nonlinear near-field imaging of plasmonic nanostructures — •Mike Prämassing, Felix Affeld, and Stefan Linden — Physikalisches Institut Universität Bonn, D-53115
Upon resonant excitation with ultrashort laser pulses, specially designed metallic nanoantennas faciliate the generation of light at higher harmonics of the excitation frequency. This effect can be used for example in metasurface designs to combine frequency conversion with other metasurface capabilities like beam fucusing or vortex beam creation.1 In this work, we report on our progress towards nonlinear near-field imaging of plasmonic nanostructures. We utilize a pulsed tunable near-infrared light source at an operating wavelength of 1550 nm. The initial pulse has a temporal width of about 400 fs and is then spectrally broadened by a single mode fiber and further compressed in time domain by a prism compressor.
We show interferometric linear optical near-field measuremetns of V-shaped nanoantennas utilizing a scattering type scanning near-field optical microscope (s-SNOM). As a further step, we plan to couple the compressed pulses into our s-SNOM setup. Thereby, we hope to measure the near-field intensity at the second harmonic frequency to be able to correlate the results with the linear measurements.
[1] Li, G., Zhang, S. & Zentgraf, T. Nonlinear photonic metasurfaces. Nat Rev Mater 2, 17010 (2017)