Agranovich, Vladimir M.

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Dr. Arganovich is a fellow in the American Physical Society. He serves as a research scientist at the Alan G. MacDiarmid NanoTech Institute and faculty member in the Chemistry Department.

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    Coherent Emission from a Disordered Organic Semiconductor Induced by Strong Coupling with Surface Plasmons
    (American Physical Society, 2012-02) Guebrou, S. Aberra; Symonds, C.; Homeyer, E.; Plenet, J. C.; Gartstein, Yuri N.; Agranovich, Vladimir M.; Bellessa, J.; 0000 0001 0919 7733 (Agranovich, VM); 82001615 (Agranovich, VM)
    In this Letter, we show that the strong coupling between a disordered set of molecular emitters and surface plasmons leads to the formation of spatially coherent hybrid states extended on macroscopic distances. Young-type interferometric experiments performed on a system of J-aggregated dyes spread on a silver layer evidence the coherent emission from different molecular emitters separated by several microns. The coherence is absent in systems in the weak-coupling regime demonstrating the key role of the hybridization of the molecules with the plasmon.
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    Efficient Optical Pumping of Organic-Inorganic Heterostructures for Nonlinear Optics
    (American Physical Society, 2012-10-18) Agranovich, Vladimir M.; Basko, D. M.; La Rocca, G. C.; 0000 0001 0919 7733 (Agranovich, VM); 82001615 (Agranovich, VM)
    We theoretically consider a hybrid heterostructure made of an inorganic quantum well in close proximity with an organic material overlayer whereby the latter is used to funnel excitation energy to the former in order to exploit the optical nonlinearities of the two-dimensional Wannier excitons. On the one hand, the diffusion length of Frenkel excitons in the organic medium is assumed to be comparable or larger than the corresponding absorption length. On the other hand, the nonradiative energy transfer from the organic to the inorganic subsytem can be very efficient when the Frenkel exciton energy is significantly higher than the band gap of the inorganic semiconductor. We show in this regime that the resonant optical pumping of the Frenkel excitons can lead to an efficient indirect pumping of the Wannier excitons (or electron-hole plasma) in the inorganic quantum well turning on the corresponding nonlinearities.

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