Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 26: Plasmonics and nanooptics II

O 26.7: Vortrag

Dienstag, 27. März 2012, 12:00–12:15, MA 005

Bottom-up Synthesis of Bowtie Nanoantenna Arrays for SERS Imaging and Spectroscopy — •Paul Kühler, Thomas Becker, Enrico Da Como, Theobald Lohmüller, and Jochen Feldmann — FB Physik, Ludwig Maximilian Universität, München

We present a novel high-throughput strategy for the bottom-up synthesis of large arrays of strongly coupled plasmonic nanostructures as reliable substrates for surface enhanced Raman scattering (SERS) imaging and spectroscopy.

We demonstrate the synthesis of billions of bowtie-shaped gold nanoantennas on a single solid substrate by using a refined combination of colloid lithography and plasma processing. With this approach, we are able to precisely control the tip-to-tip distance and the shape of the triangular gold nanoantennas for various particle sizes on a length scale well below 30 nm. We demonstrate the broad applicability of these nanostructures for SERS spectroscopy by confocal Raman imaging of graphene monolayers and substrate supported membranes. In addition to experimental studies, we have done numerical modeling to investigate the influence of shape and interparticle distance of realistic particle geometries on the propagation of SERS enhancement at the nanoantenna junctions.

This approach is a favorable alternative to current state-of-the-art fabrication technology for generating SERS active substrates over a large surface area and with high accuracy.