Abdellatif Akjouj is Professor at the University of Lille in France. His scientific activities deal with theory and modelling of wave propagation and elementary excitations in nanostructured materials, more particularly: nanoplasmonics, photonics, magnonics, phononics and optomechanics. Léonard Dobrzyński is Emeritus Research Professor at CNRS, Lille University, France. His research interests focus on interface science, phononics, magnonics, and resonance. Housni Al-Wahsh is Professor of Theoretical Physics and Head of the Engineering, Mathematics, and Physics Department, Faculty of Engineering, Benha University, Cairo, Egypt. He is primarily interested in the physical properties of electronic, plasmonic and magnonic crystals. El Houssaine El Boudouti is Professor in the Department of Physics at Université Mohammed Premier, Oujda, Morocco. His research interest concerns elementary excitations in composite materials such as phononic, photonic, electronic, and magnonic crystals. Dr. Gaëtan Lévêque is a Professor at the National Center for Scientific Research, Lille University 1, Villeneuve d'Ascq, France. Dr. Yan Pennec is a Professor at the National Center for Scientific Research, Lille University 1, Villeneuve d'Ascq, France. Dr. Bahram Djafari-Rouhani is a Professor at the National Center for Scientific Research, Lille University 1, Villeneuve d'Ascq, France.