Surface optical Raman modes in InN nanostructures
  Raman spectroscopic investigations are carried out on one-dimensional nanostructures of InN,such as nanowires and nanobelts synthesized by chemical vapor deposition. In addition to the optical phonons allowed by symmetry; A1, E1 and E2(high) modes, two additional Raman peaks are observed around 528 cm-1 and 560 cm-1 for these nanostructures. Calculations for the frequencies of surface optical (SO) phonon modes in InN nanostructures yield values close to those of the new Raman modes. A possible reason for large intensities for SO modes in these nanostructures is also discussed. 
Satyaprakash Sahoo, M. S. Hu, C. W. Hsu, C. T. Wu, K. H. Chen, L. C.   Chen, A. K. Arora, and S. Dhara