Optical properties of a multibarrier structure under intense laser fields

• Biased multibarrier structure under nonresonant intense laser fields.
• Diagonalization method and effective mass and parabolic band approximations.
• Calculation of the optical properties with nonperturbative formalism.
• Intersubband optical absorption coefficients and refraction index changes.

Using the diagonalization method and within the effective mass and parabolic band approximations, the energy spectrum and the wave functions are investigated in biased multibarrier structure taking into account the effects of nonresonant intense laser fields. We calculated the optical properties from the susceptibility using a nonperturbative formalism recently reported. We study the changes in the intersubband optical absorption coefficients and refraction index for several values of the dressing laser parameter and for some specific values of the electric field applied along the growth direction of the heterostructure. It is concluded from our study that the peaks in the optical absorption spectrum have redshifts or blueshifts as a function of the laser parameter and the electric field. These parameters could be suitable tools for tuning the electronic and optical properties of the multibarrier structure.