ELFT HÍRADÓ

[mcsete AT physx.u-szeged.hu]

Szeminárium meghívó

Elöadó: Professzor Kamarás Katalin, az MTA rendes tagja
Wigner Fizikai Kutatóközpont, Szilárdtest-fizikai és Optikai Intézet

Cím: Near-field infrared microscopy on carbon nanostructures

Idöpont: 2023. 04. 19. 15h
Helyszín: Budó Ágoston tanterem & online
https://join.skype.com/B10uwqQHQBCq

Abstract:
Scattering near-field optical microscopy (s-SNOM), based on the  
combination of atomic force microscopy and frequency-dependent light  
scattering, is an emerging method that combines high spatial  
resolution with high sensitivity even at long illuminating wavelengths.
I will present results in the infrared frequency range obtained on  
various aspects of carbon nanostructures. The most obvious task,  
identifying individual molecules, is also the most difficult, due to  
the weak scattering from molecular vibrations. Free (Drude) electrons  
in metallic carbon nanotubes or encapsulated metal clusters are more  
easily detected. The intense field under the tip can also be used to  
launch and detect the charge distribution inside nanotubes caused by  
interference of quasiparticles: plasmon-polaritons or  
phonon-polaritons. The interaction of phonon-polaritons with  
vibrational modes of molecules confined in the tubes brings the  
capabilities of the method full circle, enabling to reach a detection  
threshold of a few hundred molecules and follow their chemical  
reactions by infrared spectroscopy.

Minden érdeklödöt szeretettel várunk.

Dr. Csete Mária
Szeminárium koordinátor

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