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O: Fachverband Oberflächenphysik
O 13: Plasmonics and nanooptics: Light-matter interaction, spectroscopy I
O 13.12: Talk
Monday, March 12, 2018, 18:00–18:15, MA 041
Circular dichroism in laser induced electron emission from metallic nanohelixarrays — •Daniel Nürenberg1, Andrew G. Mark2, Peer Fischer2, and Helmut Zacharias1 — 1Physikalisches Institut & Center For Soft Nanoscience, Münster, Germany — 2Max Plank Institut für intelligente Systeme,Stuttgart, Germany
We investigate the electron emission from metallic nanohelices on silicon triggered by fs laser radiation from an optical parametric chirped pulse amplifier. We find a strong asymmetry regarding to left and right circularly polarized excitation in the electron yield in accordance to the handedness of the helices. The emission can be interpreted in terms of a non-equilibrium heating of the electron gas by surface plasmon excitation. Simulations of the surface plasmons correlate the polarization dependence of the photosignal to the local field enhancement on the nanostructures.