Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 33: Photonics and Nanooptics I: Infrared Spectroscopy
O 33.3: Vortrag
Dienstag, 8. März 2016, 11:00–11:15, H4
Monocrystalline Gold Structures Applied for SEIRA Spectroscopy — •Jochen Vogt1,2, Christian Huck1, Bettina Frank3, Xinghui Yin3, Frank Neubrech1,3, Harald Giessen3, and Annemarie Pucci1,2 — 1Kirchhoff Institute for Physics, Im Neuenheimer Feld 227, Heidelberg, Germany — 2InnovationLab GmbH, Speyerer Str. 4, Heidelberg, Germany — 34th Physics Institute and Research Center SCoPE, University of Stuttgart, Pfaffenwaldring 57, Stuttgart, Germany
Electrochemically grown monocrystalline gold triangles that can be produced easily at low costs are beneficial substrates for surface-enhanced infrared absorption (SEIRA) spectroscopy as we have proven for vibrational modes of a self-assembled monolayer of octadecanethiol. Moreover, their SEIRA performance exceeds that of polycrystalline, electron beam lithographic (EBL) triangles. Produced planar but randomly orientated on a substrate, the plasmonic resonances of the monocrystalline triangles can be spectrally tuned via their edge length. It might be interesting for applications that the plasmonic response and the SEIRA signals are almost independent on the light polarization under normal incidence, which is related to the equilateral triangular shape. However, because polarization dependent resonances of linear antennas are expected to deliver stronger SEIRA enhancement, such structures were cut out from the monocrystalline platelets by means of focused ion beam. Also for the linear antennas the monocrystalline ones show a clearly stronger vibrational signal enhancement in comparison to the EBL fabricated counterparts.