Dresden 2011 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 18: Plasmonics and Nanooptics II

O 18.6: Vortrag

Montag, 14. März 2011, 18:30–18:45, PHY C213

Mapping infrared antenna resonances of particle arrays fabricated by nanosphere lithography — •Jens Richter1, Andrea Hartung1, Jón Mattis Hoffmann1, Xinghui Yin2, and Thomas Taubner1,211st Institute of Physics, RWTH-Aachen University, Sommerfeldstrasse 14, 52074 Aachen, Germany — 2Fraunhofer Institute for Laser Technology, Steinbachstr. 15, 52074 Aachen, Germany

Infrared vibrational spectroscopy is sensitive to characteristic molecule absorption bands, yielding a "fingerprint" spectrum of the molecules involved. The sensitivity of infrared spectroscopy has been increased by several orders of magnitude with optical antennas [1-3]. Arrays of hexagonal sorted triangular metallic infrared antennas created by Nanosphere lithography (NSL) have already been shown to exhibit IR resonances [4].

Our goal is the systematic variation of the NSL fabrication parameters in order to tune the antenna resonance over the whole mid-IR spectrum. We fabricate antenna arrays on different IR-transparent substrates and vary the particles lateral size and height. Using a Fourier-Transform-Infrared-Microscope (FTIR) we determine the plasmon resonance position of each sample. Applications of those structures to surface enhanced IR-Spectroscopy (SEIRA) will be discussed.

[1] R. Adato et al.; PNAS, 106, 19227 (2009)

[2] F. Neubrech et al.; PRL 101, 157403 (2008)

[3] R. Bukasov et al.; Analyt. Chem. 81, 4531 (2009)

[4] C. Haynes et al.; J. Phys. Chem. B, 105, 5599 (2001)

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