Regensburg 2013 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 7: Plasmonics and Nanooptics I

O 7.1: Vortrag

Montag, 11. März 2013, 10:30–10:45, H31

Nanoantennas as Common Substrate for Simultaneous Surface-Enhanced Raman and Infrared Spectroscopy — •Jörg Bochterle¹, Cristiano D’Andrea², Frank Neubrech^1,3, Barbara Fazio², Pietro Gucciardi², and Annemarie Pucci¹ — ¹Kirchhoff-Institute for Physics, Heidelberg University, Im Neuenheimer Feld 227, 69120 Heidelberg, Germany — ²CNR IPCF Istituto per i Processi Chimico-Fisici, Viale F. Stagno D’Alcontres 37, I-98156, Messina, Italy — ³4th Physics Institute and Research Center SCoPE, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany

It is well known, that localized surface plasmon resonance (LSPR) frequency of nanoscopic metal particles, i.e. nanoantennas, is tunable by changing their geometric dimensions, such as length or widths for example. In our experiments, we utilize elongated nanoantennas with lengths of about 1 µm and widths and heights of 60 nm for the demonstration of simultaneous surface enhanced Raman scattering (SERS) and surface enhanced infrared spectroscopy (SEIRS). When exciting the nanoantennas with light that is polarized along the long axis, the nanoantennas feature LSPRs in the infrared (IR) spectral range, whereas light polarized along the short axis excites a LSPR in the visible. With molecules adsorbed on the nanoantennas, these two distinct resonances are tuned to match the optimum frequency simultaneously for SERS and for SEIRS. We present a prove of principle using methylene blue as probe molecule and achieve enhancements of the particular signals in the order of 10³ for SERS and 10⁵ for SEIRS.