Refractive indices of cubic-phase MgxZn1−xO thin-film alloys

Refractive indices for cubic-phase MgxZn1−xO (0.55⩽x⩽1) thin-film alloys were determined from transmission measurements and Manifacier envelope method. The refractive index of cubic MgxZn1−xO decreases with the Mg fraction increase, such as at the wavelength of 400nm the refractive index decreases from 1.89 to 1.73 as x increases from 0.57 to 1.0. The refractive index dispersion relation of cubic MgxZn1−xO in the visible-light region (400–800nm) follows the first-order Sellmeier equation and decreases with the increase of Mg fraction.