Regensburg 2010 – scientific programme
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O: Fachverband Oberflächenphysik
O 53: Plasmonics and Nanooptics IV
O 53.6: Talk
Wednesday, March 24, 2010, 16:15–16:30, H32
Second Harmonic Imaging of Gold Nanocones with a Parabolic Mirror Microscope — •Anke Horneber1, Dai Zhang1, Monika Fleischer2, Marcus Sackrow1, Kai Braun1, Dieter P. Kern2, and Alfred J. Meixner1 — 1Institute of Physical Chemistry, Eberhard Karls University Tübingen, Germany — 2Institute of Applied Physics, Eberhard Karls University Tübingen, Germany
Second harmonic generation (SHG) is a valuable technique for the visualization of surfaces. Our confocal optical microscope uses a parabolic mirror with a smaller focus than objective lenses in air and the largest possible signal collection angle. We use higher order laser modes which are often called cylindrical vector beams for the investigation of complex plasmonic structures. The longitudinal polarization component in a radially polarized laser beam focus can excite the longitudinal plasmon of a gold cone most efficiently[1]. We present first SHG images of gold nanocones with an optical resolution below 300 nm. We are developing a flexible setup that will allow non-linear experiments as well as near-field measurements. Such a setup will provide further opportunities like non-linear near-field investigations and the combination of a high spatial resolution with ultrafast dynamics.
[1] M. Fleischer et al., APL, 93 (2008) 111114.