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The optical properties of the VO2(B) structure in this study are discussed by the two components of the dielectric function (ε(ω) = _ε_1(ω) + i_ε_2(ω)) related to different polarizations in the electric field. The imaginary part of the dielectric coefficient can be obtained from the direct interband transitions through Fermi’s golden rule as:107–109(1)where VB, CB, ω, Ω, W__k, and ρ__ij denote the valence band, conduction band, photon frequency, volume of the unit cell, weight of the k-point, an...