SURFACE PHONON–POLARITON MODES OF WURTZITE STRUCTURE InN SEMI-INFINITE CRYSTAL

In this paper, theoretical study on the surface phonon–polariton (SPP) modes of wurtzite (α-) structure indium nitride (InN) semi-infinite crystal is presented. Based on an anisotropy model, the surface polariton (SP) dispersion curve of α-InN is simulated. The characteristics of this dispersion curve are discussed. The relevant experimental information by attenuated total reflection method is given. For comparison, the SP dispersion curve of cubic (β-) structure InN simulated based on isotropy model is also presented. Due to optical anisotropic, the SP dispersion curve of α-InN exhibits an extra branch as well as an extra SPP mode as compared to α-InN. In addition, the SPP mode of α-InN is found to be 4 cm-1 smaller than that of β-InN.