Optical characterization and manipulation of alkali metal nanoparticles in porous silicaA. Burchianti, A. Bogi, C. Marinelli, C. Maibohm, E. Mariotti, S. Sanguinetti and L. MoiEur. Phys. J. D, 49 2 (2008) 201-210DOI: https://doi.org/10.1140/epjd/e2008-00164-5