Etienne SNOECK - etienne.snoeck chez cemes.fr - Phone : 05 62 25 78 91
Florent HOUDELLIER - florent.houdellier chez cemes.fr - Phone : 05 62 25 78 80
The HHT / CNRS partnership is the result of close contacts established between the CEMES-CNRS microscopy researchers and the HHT R&D engineers established for the realisation of a unique microscope "I2TEM" inaugurated in spring 2013. This microscope combines « in-situ » TEM experiments, which consists in applying to a sample an external stimuli and studying its effect on the object itself and on the neighboring fields by electron interferometry (electron holography). The development of original experiments carried out on I2TEM and the valorisation of this TEM to future users are the subject of the first part of the HHT/CEMES-CNRS partnership.
CEMES is also pursuing instrumental developments in the field of advanced electron sources. CEMES researchers have developed the use of "carbon nanocons" as brighter and better coherent electron sources that are used in a cold field emission gun. These new sources, patented by the CNRS, are of interest to HHT, which has successfully tested them in its scanning and transmission electron microscopes with the help of CEMES researchers. HHT is now considering using these new ultra-bright sources in their equipment. These source developments constitute the second part of the partnership between HHT and the CNRS.
The third part of the association is more prospective and ambitious : it aims at the development of coherent time-resolved TEM. The objective of the CEMES, in close collaboration with researchers at the laboratoire de Physique des Solids d’Orsay (CNRS-Université Paris Sud), is to produce a microscope to perform pump / probe experiments by injecting a femtosecond laser on the object to be studied (the pump) and on the cold FEG tip (with a tunable time delay) thus making possible to produce a femtosecond pulsed electron probe. The scientific objective of this "FemtoTEM" project is to perform local "pump-probe" experiments allowing the study of the dynamics of ultra-fast physical processes (optical, magnetic, elastic). The company HHT and the CEMES-CNRS wish to combine their respective skills to possibly transfer these very innovative developments of time-resolved microscopy on a commercial instrument.
- Microscope électronique en transmission I2TEM du CEMES (Centre d’élaboration de matériaux et d’études structurales)