Regensburg 2013 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 39: Optical properties

HL 39.7: Talk

Tuesday, March 12, 2013, 12:00–12:15, H13

Theory of Metal Nano-Particle Affected Optical Properties of Supramolecular Complexes — •Yaroslav Zelinskyy, Gerold Kyas, Yuan Zhang, and Volkhard May — Institut für Physik, Humboldt Universität zu Berlin, Newtonstrasse 15, D-12489 Berlin, Germany

Optical and transport properties of supramolecular complexes (SC) placed in the vicinity of a metal nanoparticle (MNP) are investigated by applying a density matrix approach. This enables a nonperturbative consideration of the excitation energy transfer coupling in the SC as well as between the SC and the MNP. The coupling can be described in terms of a shift and a broadening of all Frenkel exciton levels together with a remarkable oscillator strength change. In particular the latter effect becomes clearly observable in absorption and emission spectra and explains the MNP induced enhancement of molecular spectra. Resulting from the absorption enhancement sub-picosecond laser pulse induced spatio-temporal excitation energy localization in the SC near a MNP is predicted. The importance of MNP multipole excitations is underlined at several places. The exact description of the interacting SC MNP coupling is confronted with a mean--field approximation which directly leads to a local field description of the effect of the MNP on an individual molecule. (Y. Zelinskyy, Y. Zhang and V. May, J. Phys. Chem. A 116, 11330 (2012), G. Kyas, Y. Zelinskyy, Y. Zhang, V. May, Ann. Phys. (in press), Y. Zelinskyy, Y. Zhang and V. May, J. Chem. Phys. (submitted)).