1. Institut National de la Recherche Scientifique (INRS), EMT Research Center, 1650 Boul. Lionel-Boulet, Varennes, QC, J3X 1S2, Canada.
2. Università della Calabria, Dip. DIBEST, Via Bucci 33c, 87036 Rende, Italy.
3. Foundation for Research and Technology-Hellas, Institute of Electronics Structure and Laser, PO Box 1527, GR-71110 Heraklion, Crete, Greece.
4. CENBG, Université de Bordeaux, CNRS/IN2P3, 19 Chemin du Solarium, CS 10-120, 33175 Gradignan, France.