Berlin 2014 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 5: Posters 1: Electronic Spectroscopy, Photochemistry, Femtosecond Spectroscopy

MO 5.24: Poster

Montag, 17. März 2014, 16:30–18:30, Spree-Palais

Characterization of surface plasmon excitation using femtosecond pulses for ultrafast time resolved spectroscopy using a Kretschmann arrangement — •Alireza Mazaheri Tehrani, Faezeh Mohaghegh, Mahesh Namboodiri, and Arnulf Materny — Research Center for Functional Materials and Nanomolecular Science, Jacobs University Bremen, Campus Ring 1, D-28759 Bremen, Germany

The interactions of molecules adsorbed on thin metal films with surface plasmon polaritons are of great importance for spectroscopic applications such as surface enhanced Raman spectroscopy (SERS). In our work, we would like to gain a better understanding of the coupling of the electronic systems of metal and adsorbate. For this, we use a Kretschmann configuration, which helps to characterize the interaction in a reproducible manner. So far, many investigations have been done in the frequency domain. However, in the time domain, due to the nature of the femtosecond pulses, the coupling of the ultrashort pulses to the surface plasmon could be different in nature and efficiency. Therefore, a precise characterization of this process is needed to ensure the correct interpretation of time resolved experiments. In our contribution, we present our preliminary results, which help to better understand the interaction of femtosecond laser pulses with the electrons of thin metal layers.