Search

We report the simultaneous growth of hexagonal AlB2-phase and tetragonal ThSi2-phase nanoislands of erbium silicide on the same silicon substrate. As a new technique, the patterned Si(001) surface with pits in a reverse-pyramid shape and {111} sidewalls is taken as the substrate template. The distribution of nanoislands reveals that the upward diffusion over surface steps plays an influential role on the location of islands. Si {111} facets on the pit sidewalls actually provide growth symmetry for the hexagonal islands. This work paves the way for exploring the intrinsic electrical transport properties of metal-semiconductor nanocontacts. [ABSTRACT FROM AUTHOR]

We demonstrate a cw and actively Q-switched Er:LuAG laser resonantly dual-end-pumped by 1532 nm fibre-coupled laser diodes. A maximum cw output power of 1.9 W at 1650.3 nm is obtained at a pump power of 25.5 W, corresponding to a slope efficiency of 43.3%. In the Q-switched regime, the maximum pulse energy of 3.51 mJ is reached at a pulse repetition rate of 100 Hz, a pulse duration of 90.5 ns and a pump power of 25.5 W. At the repetition rate of 400 Hz, the output energy is 2.12 mJ, corresponding to a pulse duration of 125.4 ns. [ABSTRACT FROM AUTHOR]