Heidelberg 2015 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 2: Quantum Control

MO 2.5: Vortrag

Montag, 23. März 2015, 12:45–13:00, PH/HS1

Phase-controlled polarization decay and line-shape modifications in complex systems — •Kristina Meyer, Zuoye Liu, Niklas Müller, and Thomas Pfeifer — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany

Recently, our group demonstrated the transformation of Fano to Lorentzian line shapes and vice versa in time-resolved absorption experiments in helium. This was realized by inducing phase changes in the singly and doubly excited states by means of laser pulses, enabling the control of the optical dipole response [1]. Now, we show that this mechanism can be generalized to more complex systems in the liquid phase. For this purpose, we performed transient-absorption measurements in the dye molecule IR144 dissolved in methanol. By applying 7-fs short NIR laser pulses significant modifications of the IR144 absorption spectrum could be observed. In order to investigate if the measured line-shape changes could originate from the same Fano-phase formalism as derived for the case of helium, we carried out a numerical simulation. The extremely good qualitative agreement of simulation and experiment proves the universal applicability of the phase-control mechanism to complex systems.

[1] C. Ott et al., Science 340, 716 (2013)