Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 25: Plasmonics and nanooptics: Light-matter interaction, spectroscopy II
O 25.3: Vortrag
Dienstag, 13. März 2018, 11:00–11:15, MA 041
Vertically coupled complementary antennas as plasmonic nanosensors for the optical sensing of molecules in the mid infrared. — •Gökalp Engin Akinoglu and Michael Giersig — Freie Universität Berlin
Infrared plasmonic nanosensor (IR-PS) for surface enhanced infrared absorption spectroscopy are of great interest for the sensing of biological molecules. Here, we report on a novel design of a IR-PS based on vertically coupled complementary antennas (VCCAs). Fabrication of hexagonal ordered silicon Nanopillar arrays is realized by the combination of nanosphere lithography (NSL) and metal assisted chemical etching(MaCE). First, a hcp monolayer of polystyrene particles is plasma etched to form a non-close packed array which is used as a lithography template during metal deposition to obtain a metallic film with periodically ordered perforations. The latter undergoes MaCE to yield the hexagonaly ordered silicon Nanopillar arrays. Finally, the pillar array is coated with gold to produce a complementary plasmon active perforated film between the pillars and plasmon active disks on top of the pillars. We show that the optical response of the VCCAs is tunable through the geometric dimensions of the structure and we observe enhanced near field intensities from 102 up to 103.