Figure 3

Index of refraction N and extinction coefficient k ( = [N + ik]²) of the n-type GaAs substrate (dotted lines), the undoped GaAs buffer layer and SL sublayers (solid lines), and GaN_0.009As_0.991 (dashed line) for example. The position of the PSP⁺ mode is indicated as the frequency at which the substrate refractive index becomes less than 1. The GaN_0.009As_0.991 optical spectra reveal the Ga-N sublattice resonance at TO₂ (vertical line).

(click for full image)

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