Nano-assembling and optical properties of sub-100 nm raspberry-like nanoparticles Chouaib Daoudi, Mahmoud Ould Metidji, Mohamed Remram, Anne-Marie Jurdyc, Matteo Martini, Hélène Gehan and Dominique Vouagner Eur. Phys. J. Appl. Phys., 82 2 (2018) 20401 Published online: 03 August 2018 DOI: 10.1051/epjap/2018180065