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How the environment affects the optical properties of a molecule close to a metal nanoparticle? Theory and applications

Giovedý 5 ottobre 2017 alle ore 15:00, aula Seminari, S3 Cnr Nano, edificio Fisica, Dipartimento FIM, Modena

Relatore: Emanuele Coccia (CNR - NANO S3, Modena, Italy
Abstract: The main goal of the seminar is to give an overview on the development of theoretical approaches for the description of molecular targets close to plasmonic nanoparticles and for ultrafast two‐pulse spectroscopy of fluorophores.
We add the effects of an external environment, i.e. relaxation and dephasing of the molecular wave function, in the framework of the stochastic Schr÷dinger equation (SSE) [1].
First, the interaction between a test molecule (LiCN) and a spherical silver nanoparticle [1] under the influence of an electromagnetic field, leading to modifications of the electronic and optical properties of LiCN, is studied by means of a multiscale model [2].
We study the time evolution of the properties of LiCN as a function of the distance from the silver nanoparticle and of the dephasing time.
Second, the emission of the terrylenediimide (TDI) fluorophore is investigated by varying the time delay and the phase shift between two sequential pulses interacting with the molecule, using SSE [3].
Dephasing induced by the environment is essential to reproduce the experimental phase-dependent behavior of the TDI emission [4].
Detuning effects are also explored.

Bibliography
[1] E. Coccia and S. Corni, in preparation
[2] S. Pipolo and S. Corni, J. Phys. Chem. C, 120, 28774 (2016)
[3]E. Coccia and S. Corni, in preparation
[4]R. Hildner, D. Brinks and N. F. van Hulst, Nature Phys., 7, 172 (2011)

[Ultimo aggiornamento: 05/10/2017 13:00:24]