Dresden 2014 – scientific programme
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O: Fachverband Oberflächenphysik
O 46: Plasmonics and Nanooptics I
O 46.8: Talk
Wednesday, April 2, 2014, 12:15–12:30, TRE Phy
Gold strip gratings for surface enhanced infrared spectroscopy — Tao Wang1, •Tobias W. W. Maß1, Vu Hoa Nguyen2, Andreas Buchenauer2, Uwe Schnakenberg2, and Thomas Taubner1,3 — 1I. Institute of Physics (IA), RWTH Aachen University — 2Institute of Materials and Electrical Engineering I, RWTH Aachen University — 3Fraunhofer Institute for Laser Technology (ILT)
Metallic nanoantennas efficiently couple light into a region of subwavelength size. Antenna arrays designed for surface enhanced infrared absorption spectroscopy enable the detection of molecular vibration with high sensitivity [1,2]. In contrast to the cost-intensive and low-throughput fabrication of nanostructures e.g. via e-beam lithography, gold strip gratings fabricated with standard optical UV-lithography offer great potential for future commercial applications. The grating structures are analysed using FTIR-spectroscopy and exhibit grating resonances depending on the period and the refractive index of the environment. Accordingly, the grating resonances can be tuned over a broad spectral range in order to match and enhance the absorption bands of interest. We demonstrate enhancement factors of more than 6000 and significantly amplify the well defined absorption band of a 30 nm thick PMMA layer at about 5.8 µm [3].
[1] Adato et al. PNAS 2009 106(46), 19227-19232.
[2] Neubrech et al. Phys.Rev.Lett. 2008 101(15), 157403.
[3] Wang et al. Opt. Express 2013 21(7), 9005-9010.