Optical spectra and electronic structure of indium nitride

A complete set of fundamental optical functions is calculated for hexagonal indium nitride (w-InN) in the energy range 0-130 eV based on knowledge of the reflection spectrum. The integrated spectrum of the dielectric permitti vity is resolved into elementary components. Three fundamental parameters a re determined for each component (the maximum energy, the width, and the os cillator strength). A possible origin of these components of the dielectric constant is proposed on the basis of known theoretical calculations of the indium nitride band structure. (C) 1999 American Institute of Physics. [S1 063-7826(99)00304-X].