Figure 2From: Improved infrared photoluminescence characteristics from circularly ordered self-assembled Ge islands SEM images of Ge islands grown on a FIB pre-patterned region with (a) smaller (approx. 160 nm) and (b) larger (approx. 500 nm) spacing of holes. The circles drawn in Figure 1a show the ordering of islands along the circular periphery. The inset in (b) shows the array of islands in higher magnification.Back to article page