Regensburg 2013 – scientific programme
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O: Fachverband Oberflächenphysik
O 53: Scanning Probe Methods II
O 53.13: Talk
Wednesday, March 13, 2013, 19:00–19:15, H31
Infrared nanoscopy of biomaterials — Adrian Cernescu1,2, Sergiu Amarie2, Tobias Geith3, Stefan Milz4, and •Fritz Keilmann1 — 1Ludwig-Maximilians-University and Center for NanoScience, Garching, Germany — 2Neaspec GmbH, Martinsried, Germany — 3Ludwig-Maximilians-University, Institute for Clinical Radiology, Munich, Germany — 4Ludwig-Maximilians-University, Department of Anatomy, Munich, Germany
Spectroscopic near-field imaging is enabled by combining 20nm-resolving tip-scattering near-field microscopy (s-SNOM) with an infrared continuum source. Specific contrasting of biomineral components is enabled by simply choosing the appropriate "fingerprint" infrared region that as in traditional FTIR (Fourier-transform infrared spectroscopy) identifies virtually any chemical compound. Hence nano-FTIR stands for the successful realization of combining s-SNOM and FTIR [1].
The investigated samples are nanocomposite biomaterials, namely human bone sections, human tooth specimens and mollusk shell which contain mineral nanocrystals in organic matrices [2]. The mineral parts are highlighted by their resonantly enhanced contrast due to phonons.
Our method is surface-sensitive, probing to a depth of about 30 nm. It should be straightforwardly applicable in many fields of general mineralogy, solid state research, and materials science.
[1] S. Amarie, T. Ganz, and F. Keilmann, Opt. Express 17, 21794 (2009); [2] S. Amarie, P. Zaslansky, Y. Kajihira, E. Griesshaber, W.W. Schmahl and F. Keilmann, Beilstein J. Nanotechnol. 3, 312 (2012).