Fig. 4

(a) Transmittance; (b) Reflectance of the Ti₄O₇ films as a function of T_s; (c) Comparison of the absorption coefficients, over the 300–1500 nm spectral range, of the Ti₄O₇ films deposited at different T_s; (d)T_s dependence of the integrated absorption coefficient (I_Abs) of the Ti₄O₇ films.