Prof. Dr. Nikolai A. Sobolev is currently a Retired Professor at the Department of Physics, University of Aveiro, Portugal. He received his PhD in semiconductor physics from Friedrich Schiller University of Jena, Germany. He is a founding member of the Institute of Nanostructures, Nanomodelling and Nanofabrication (i3N), where he continues to conduct research. He has published more than 200 papers in peer-reviewed journals and conference proceedings, as well as 7 patents and 4 book chapters as an author or co-author. He has been an invited professor and invited scientist at universities in Berlin, Jena, Ulm (Germany), Gdansk (Poland) and Moscow (Russia). Nikolai Sobolev has been the co-ordinator of several international and national research projects and has chaired or been a member of committees at more than 50 international conferences.