CITIUS Research

Time and angle resolved photoemission spectroscopy 

We use time and angle resolved photoemission spectroscopy for investigating ultra-fast response of electrons to laser pulses in novel advanced materials. For this purpose we employ a two-color pump-probe scheme where femtosecond pump pulses in the visible/infrared excite electrons to higher energetic levels, which are then probed by ultra-short extreme-ultraviolet pulses (produced by laser high harmonic generation). Research is currently focused on superconductors, topological insulators, and metal/organic molecule interfaces.

Time and angle resolved photoemission spectrum (trARPES) as a function of energy and pump-probe delay at the Γ point in CaFe2As2.


Characterization and control of high-harmonic generation

We explore novel generation schemes for producing high-harmonics of the Ti:Sa laser in gas with exotic properties. Current research focuses on the generation of extreme-ultraviolet light carrying both spin and orbital angular momenta. For this purpose we utilize a two-color wave-mixing scheme, where we perturb the high-harmonic generation process with the second harmonic of the driving laser.

Transverse profiles of the ring-like shaped optical vortices carrying orbital angular momentum (OAM) obtained at CITIUS with the two-color wave-mixing scheme. For each harmonic (h) of the driving laser, the OAM content (l) can be controlled by adjusting the intensity of the two colors.


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The CITIUS laboratory has established several international collaborations which include CEA (Paris, France), IJS (Ljubljana, Slovenia), University of Regensburg (Germany), Synchrotron SOLEIL (Paris, France), University of Leuven (Belgium), etc.





Ultima modifica il Venerdì, 23 Giugno 2017 14:48