Figure 11

Linearly polarized photoluminescence (PL) of structures with 8, 3 and 1.5 nm spacers measured in edge geometry. The polarization changes from mostly TE for uncoupled islands (8 nm spacers) to mostly TM (accompanied by a red shift) for vertically coupled islands (1.5 nm spacers). The 3 nm spacer sample shows emission from both types of islands. The relative arrangement of islands is shown schematically in the right figures in relation to edge luminescence polarization axes