COLLOQUIUM
Institute of Physics Polish Academy of Sciences
 
 


The formal colloquium of the Institute of Physics, Polish Academy of Sciences it the main ongoing periodic series of lectures in physics and related science, of interest to members of the Institute. It is held from 1977. Colloquium speakers are primarily domestic and foreign scholars of established reputation, but also less-known physicists with remarkable and current scientific achievements. The colloquium is held once a month from September to June, usually at 3:15 PM on the last Tuesday of the month in the Auditorium of the Institute of Physics. Colloquia are open to the public, and are preceded by a coffee/the reception at the Institute.

For future information about the colloquia, pleace contact Prof. Dr. hab. Tomasz Dietl (dietl@ifpan.edu.pl), current chairman of the colloquium committee.

NOTICE OF NEXT COLLOQUIUM


We are pleased to announce that on October 24th 2017 (Tuesday) at 15:15 in the Institute of Physics, in the L. Sosnowski's auditorium will be held colloquium of the Institute of Physics PAS, in which:

Prof. Dr. hab. Eng. Marek Samoć

from Faculty of Chemistry, Wrocław University of Science and Technology, will give a lecture entitled:

Nonlinear optical properties of metal-containing nanostructures: plasmonic particles, metal clusters, coordination polymers

We cordially invite to attend the colloquium and please to inform other interested persons. Before the colloquium, at 14:45, participants are welcome for coffee, tea and biscuits.

  Colloquium Committee




Abstract


      Optimized third-order nonlinear optical (NLO) materials are required for a number of applications in laser technologies, telecommunication and biophotonics. We have been exploring several pathways towards systems where one could optimize both the magnitude of the nonlinear optical effect of interest and other functionalities of the system such as bright luminescence in desired wavelength range or biological functionalities.
Promising materials include nanoparticles that can be engineered for particular functions, employing wet chemistry approaches for syntheses of colloidal nanoparticles and ligand exchange. Relatively well known are advantages of semiconductor particles (quantum dots) as e.g. markers in nonlinear microscopy for biological use. We found that they can be outperformed in certain respects by noble metal particles, in which the optical properties are strongly dependent on the presence of localized surface plasmon resonances. On the other hand, relatively small metal clusters (e.g. Au25), that do not support plasmonic excitations, can also show efficient two-photon absorption and can be engineered to provide additional useful features, like high emission quantum yield and very strong nonlinear chirooptic properties.
Our most recent work has focused on NLO effects in coordination polymers, including metal-organic frameworks (MOFs). We have found that nanoparticles of a well-known pigment, Prussian Blue, exhibit very strong nonlinear absorption, which was identified as a sequential process involving two-photon absorption followed by absorption of a third photon. For certain MOFs, containing ligands with high intrinsic NLO properties, we have also seen both strong, metal ion dependent, nonlinear absorption and efficient multiphoton-induced emission.