Lecture Davide Bossini
|11 March 2011||FWN-Building 5114.0004, Nijenborgh 4, 9747 AG, Groningen|
|Affiliation:||Institute for Molecules and Materials, Radboud University, Nijmegen|
|Title:||Femto-second time resolved stimulated Raman scattering|
|Date:||Fri Mar 11, 2011|
|Host:||Paul van Loosdrecht|
|Telephone:||+31 50 363 8149|
The control of the magnetization of a medium by light represents an active and challenging research fields. In fact this approach could satisfy the demand for an increasing speed of information storage and manipulation. From a fundamental point of view, this means the exploration of unexplored physics: the excitation provided by ultrashort laser pulses brings the system in a non-equilibrium state. The time scale of the relaxation dynamics (order of femto-seconds) doesn't allow a thermodynamical description of the magnetic properties for the excited material, which is based on the concept of equilibrium state (which is reached only several nanoseconds after the original excitation). Recently [1, 2] all-optical control of the magnetization has been shown in several experiments. The mechanism underlying these observations is still to be deeply understood.
In order to investigate the role played by phonons and magnons in these processes, we want to investigate these non-equilibrium dynamics with a new technique, namely the Femto-Second Time Resolved Stimulated Raman Scattering (FSRS). This technique has never been applied to solid state physics, however it provides some remarkable advantages and improvements in comparison to the well known Time-Resolved Spontaneous Raman Scattering.
This experimental approach will be shown, reporting the mechanism and the state of art of the FSRS. Interesting and challenging applications of this technique will be as well illustrated.
 A.V.Kimel, A. Kiriliyuk, Th. Rasing et al. Nature , 435, 03564, (2005).
 K.Vahaplar, A.V.Kimel et al. Phys. Rev. Lett. 103, 117201, (2009).
|Last modified:||22 October 2012 2.31 p.m.|