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O: Fachverband Oberflächenphysik

O 46: Plasmonics and Nanooptics I

O 46.3: Vortrag

Mittwoch, 2. April 2014, 11:00–11:15, TRE Phy

Large-Area Low-Cost Resonant Nano-Antenna Enhanced SEIRA Substrate Using Interference Lithography — •Shahin Bagheri, Frank Neubrech, and Harald Giessen — 4th Physics Institute and Research Center SCoPE, University of Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany

We manufactured large-area plasmonic antenna arrays by laser interference lithography for surface-enhanced infrared absorption. Geometrical parameters of the homogeneous antennas can be precisely defined by changing the interference condition in each exposure process independent of the underlying wafer. Such antennas with tunable and high quality resonances from near- to mid-infrared (1 to 7 µm) are well suited as substrates for surface-enhanced infrared absorption studies. We show the broad applicability of these substrates by enhancing the infrared vibrational signals of a monolayer octadecanethiol and monitoring the ultraviolet degradation of a polymer via the decrease of its specific vibrational modes. Large-area and fast fabrication process make our approach suited as a low-cost sensing platform for a variety of different SEIRA real-world applications.