Düsseldorf 2007 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 53: New Experimental Techniques
MO 53.4: Vortrag
Donnerstag, 22. März 2007, 15:00–15:15, 6D
Broadband Multiplex CARS Microscopy employed for Polymer Analytics — •Bernhard von Vacano, Lars Meyer, and Marcus Motzkus — Physikalische Chemie, Philipps-Universität Marburg, D-35032 Marburg, Germany
Broadband multiplex coherent anti-Stokes Raman Scattering (MCARS) microscopy can be implemented with a single laser using supercontinuum generation in a photonic crystal fiber.[1,2] In such a scheme, a spectrally narrow portion of a femtosecond oscillator is employed as pump and probe frequency components, while the remaining pulse energy is used to create a broadband Stokes supercontinuum, covering at once a vibrational range of more than 2000 cm−1. This robust approach allows rapid chemical mapping of material samples with three-dimensional spatial resolution. A successful MCARS implementation and applications are presented for the identification and mapping of polymer blends. An evolutionary fitting routine is used for a fully quantitative analysis of the spectral signatures resulting in high contrast chemical maps.
[1] T. W. Kee and M. T. Cicerone, Optics Letters 29, 2701 (2004).
[2] H. Kano and H. Hamaguchi, Applied Physics Letters, 86 (2005).