▎ 摘　　要

Objective: Investigating the effect of substituting Cobalt (Co) on the optical properties of graphene-like InAs has been carried out. Methods: Calculations were performed by the full potential linear augmented plane wave (FP-LAPW) approach in the density functional theory framework with the computational Wien2k. Result: The results were compared with the optical properties of graphene-like InAs including the imaginary and real part of the dielectric function, the refractive index, optical conductivity, absorption coefficients, loss function, and extinction coefficients. Also, the energy gap, the static refractive index, and the plasmonic frequency were by using the roots of dielectric function and maximum electron loss function. Finally, it was revealed that adding impurity decreased the energy gap and increased refractive index.