Zernike Institute for Advanced Materials Colloquium Keith Nelson
|08 mei 2008||FWN-Building 5111.0080, Nijenborgh 4, 9747 AG, Groningen|
|Speaker:||Prof. Dr. Keith Nelson|
|Title:||Collective coherent spectroscopy and collective coherent control|
|Date:||Thu May 8, 2008|
|Start:||16.00 (Doors open and coffee available at 15.30)|
The study of fast collective processes in condensed matter often demands novel spectroscopic methods. For study of phase transitions, chemical reactions, and other irreversible events in crystalline solids, techniques have been developed that permit observation of ultrafast dynamics in a single laser shot, in real time. In addition, direct optical excitation and observation of the collective vibrational and electronic modes that play important roles in collective rearrangements can be carried out. Methods are being developed to achieve coherent control over collective material behavior and structure. In many cases, both coherent spectroscopy and coherent control can be enhanced through femtosecond pulse shaping through which the optical field can be tailored, temporally and sometimes spatially as well, in order to achieve a specified objective. Coherent excitation and control of acoustic modes of all frequencies and wavelengths, optic phonon and phonon-polariton modes, and electronic modes including excitons and biexcitons will be illustrated and the insights provided into collective behavior will be highlighted.
|Laatst gewijzigd:||22 oktober 2012 14:30|