In this paper, we have been studied the optical properties such as refractive index n(ω), absorption coefficient α(ω), and dielectric constant of wurtzite (WZ) GaN semiconductor using the plane-wave pseudopotential method within density functional theory (DFT). We have also been calculated the optical phonon modes using phonon calculation on Cambridge Serial Total Energy Package (CASTEP) software at 0 GPa. The calculated values of all above parameters are compared with the available experimental values and the values reported by different workers. A fairly good agreement has been found between them.
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