Influence of Excitation Frequency on Raman Modes of Thin Films
Figure 1
Raman spectra of ( = 0, 0.15, 0.30, and 0.54) thin films using red laser excitation source (785 nm = 1.58 eV). The dashed lines are guides to eyes tracing variation of A1(LO) and its replica 2A1(LO) mode with increasing Ga atomic fraction. The asterisk (red) indicates the A1(TO) GaN mode, and circles show the sapphire modes observed in In0.46Ga0.54N thin films (colored online).
