Dresden 2011 – wissenschaftliches Programm
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 Taubner1,2 — 11st 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 .
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.
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