Linear and nonlinear intersubband optical absorption coefficients and refractive index changes in symmetric double semi-V-shaped quantum wells

► The effects of I, L, and LB on the optical properties of the DSVQW are investigated. ► The refractive index can be considerably modified and controlled by the L and LB. ► The optical absorption coefficient can be considerably modified by the L and LB. ► The absorption coefficient and refractive index are reduced, as I increases. ► The total absorption coefficient is strongly split up into two peaks with the L and LB.