Due to their appealing size-dependent properties, semiconductor and metallic nano-objects (nanocrystals, nanowires) have been predicted to act as technological boosters in various fields including nano-electronics, optoelectronics, photonics, magnetism, and photovoltaics. The capability to control size, shape, composition and doping of these nano-objects is crucial to finely tailor their properties. Nevertheless, the future implementation of these elemental building blocks in functional devices at nano-scale requires precise control of the organization of the nano-objects in terms of density and relative positioning within well organized structures. The capability to fabricate ordered arrays of nano-objects and to precisely organize the nano- objects on appropriate substrates or inside various matrices is the key point to support the technological development of new device concepts with predictable characteristics based on these novel nano …